| Answers |
|
| 1. |
Unpacking & storage. |
| 1.1. |
Contents, Unpacking & storage - Procedure and precautions |
| 1.1.1. |
Packed carton box contains - the Meter fitted with Surge suppressor across auxiliary supply terminals, Quick Start Guide (QSG), Limited Warranty Certificate, Error chart, Test and Calibration certificate, Spark Quench (only for EM3460 model) and Write up/ Connection details of MOV and Spark quenches (if applicable) |
| 1.1.2. |
First check the carton for signs of damage or liquid spills. If any damage is found, then you must lodge a claim with the transporter. In this case, please contact the transporter before proceeding with the unpacking; he may want his agent to be present. Please also read the Schneider Electric Conzerv Warranty certificate received with the meter |
| 1.1.3. |
Do not remove the protective plastic cover of your new Meters until the time of installation. Preserve the packing material. This will be required if the Meter needs to be shipped later for service or calibration. |
| 2. |
Installation & commissioning |
| 2.1. |
Procedure of installation & commissioning |
| 2.1.1. |
Please go through the Quick Start Guide (QSG) supplied with each new Meter for instructions, programming guidelines and installation/ commissioning. You can also down load from the website www.conzerv.com For detailed instructions and meter features, 'User Hand Book' can be down loaded from the web site. |
| 2.2. |
Can I program the Meter at site without any training? |
| 2.2.1. |
Yes. The Meter is field programmable by the user. Please follow the Quick Start Guide (QSG) supplied with the Meter. You can also down load from the website www.conzerv.com |
| 2.3. |
Display of the Meter does not get ON. |
| 2.3.1. |
Check the auxiliary supply to the Meter. |
| 2.3.2. |
Auxiliary supply should be given as per the factory set levels either 110V AC, 50Hz or 240V AC, 50 Hz as specified in the Meters. |
| 2.3.3. |
Check the auxiliary supply is in the range of 85 to 130V for 110V nominal. The range of 190 to 270V for 240V nominal. If the auxiliary supply voltage is below or higher than the range specified above, correct it. |
| 2.3.4. |
Caution: Ensure the Surge Suppressor (MOV) supplied with the Meter is connected across the auxiliary supply terminals, to protect the Meter from surge voltage. |
| 2.3.5. |
Check the fuse in the auxiliary supply route. If blown, identify the cause (short circuit etc. in the connection external to the meter) and correct it. Then replace the fuse. |
| 2.3.6. |
Check the Surge Suppressor supplied with the Meter. If blown, replace with same rating. |
| 2.4. |
Why does EM 3000 Meter display Err 158 while attempting full setup programming? |
| 2.4.1. |
If the Vin and Iin signals are connected to EM 3000 Meter while attempting the full setup programming, Err 158 will be displayed. Full setup programming should be done with only auxiliary supply connected to the Meter. |
| 2.5. |
Is it essential to connect the Spark Quenchers/ Suppressors that are supplied with every EM 3460 (Smart Demand Controller) ? |
| 2.5.1. |
Yes, as it protects the Meter against any electrical spikes across relay terminals |
| 2.6. |
Why is the auxiliary supply terminals fitted with Surge Suppressor ? |
| 2.6.1. |
This is Metal Oxide Varistor (MOV), which protects the Meter from transient/ voltage surge. This will get electrically short circuited when the voltage at auxiliary supply terminals goes above the rating of MOV (rating is 270V for 240V auxiliary supply and 130V for 110V auxiliary supply). This will blow up/rupture the fuse in the auxiliary supply route, thereby stop the voltage supply to auxiliary terminals of the Meter. |
| 2.6.2. |
The blown MOV (rating is 270/20 for 240V auxiliary supply and 130/20 for 110V auxiliary supply) and fuse have to be replaced with same rating to make the Meter operational again. |
| 2.7.I |
get negative KW readings on my EM 3000 Meter. Why ? |
| 2.7.1. |
Check for correct CT connections. If CT polarities are reversed, negative KW readings will be displayed. This will also affects the Active Energy recording. In order to identify the phase having CT reversal, view phase wise kW readings under kWAvg. (press MORE key to view phase wise KW). The phase showing negative reading is the phase in which CT is reversed. Then correct the polarity of the CT terminals to get the +ve summation of power. Alternatively phase angles of Current signal can be verified for determine the polarity of the CT. If the polarities are interchanged phase angle will be 180º out of phase. Correct the connection |
| 2.8. |
If spare load is positive in EM 3460 (Smart Demand Controller), what can I do ? |
| 2.8.1. |
If spare load is positive you can connect additional load mentioned against Spare load without exceeding the set demand limit. |
| 2.8.2. |
Eg : The spare load displayed in the EM 3460 Meter is (+)300, you can connect an additional load of 300 KW/KVA (depends on the Demand parameter set by user i.e. Either in KW or KVA). |
| 2.9. |
I have tried to program the EM3000 Meter for Vpri as 110kV/110V and Ipri as 5000A. But Meter does not accept this setting. Why? (or what is maximum Full Scale range of VA in EM 3000 series Meter ?) |
| 2.9.1. |
The EM 3000 series meter can accept the full scale up to 650 MVA. Full scale is given by Root 3 * Vpri * Ipri. In this example the Full Scale works out to 953 MVA ( 1.732 *110*5000/1000). As this is higher than the full scale limit of EM 3000, Meter will not accept this setting. The Meter will automatically choose an Ipri value of less than 5000A to get a Full scale of not more than 650 MVA. In applications where VA is higher than the upper limit, program the EM for a lesser Ipri. Eg : In above example the CT can be programmed as 500/5 and use MF of 10. |
| 2.10. |
M 3000 gives kVAh, kWh and KVARh (integrated parameter). Are separate readings for Import and Export available ? OR is the net of Import and Export displayed? |
| 2.10.1. |
Yes, separate readings are available in all EM 3000 series when ordered with 'IE' option. The term is Forward for import, Reverse for export and Net for net of import and export. |
| 2.11. |
What is THD? Will this affect the reading of other parameters in EM 3000 Meter ? |
| 2.11.1. |
THD is Total Harmonic Distortion. The Meter displays %ge Total Harmonic Distortion in Voltage and Current waveforms. The value of THD will not affect the other parameter reading. All parameter readings will be accurate with True RMS method as per CBIP 88 specifications. |
| 2.12. |
What is the use of "PROFILE" function ? |
| 2.12.1. |
The Meter generates four highs and four lows of Basic parameter (V, I and Hz) and Power parameters with date and time of occurrences from the time of installation till the last clearance. |
| 2.12.2. |
The main uses of profile function are: |
| 2.12.3. |
Highlights abnormal conditions. Eg : High Voltage, low Voltage, low frequency etc. |
| 2.12.4. |
Diagnosis of faulty equipment by studying the profiles. Eg : If a motor burns out, it is possible to determine the causes by studying the profiles viz. High voltage, low frequency etc. |
| 2.12.5. |
Meter also generates Demand profile of nine highs and nine lows of the reference demand set (need to be set in the Meter while programming by the user). The main use of this profile is to optimise and reduce the contract demand by observing the demand profile over a period of time. For more details please read EM 3000 User Hand Book. |
| 2.13. |
Can EM 3000 Meter is programmed to indicate/ show two primary currents. |
| 2.13.1. |
EM 3000 Meter can be programmed for one primary current (Apri) only. For the second primary current multiplication factor can be applied with out changing the first primary current setting in order to retain and view the accumulated data (integrated) of the first primary current setting. Alternatively, first primary current to be programmed and readings to be noted. Then it should be programmed for the second primary current and readings to be noted. But, each time when changed the primary current (by doing the full setup programming) the previous accumulated data (integrated parameter) will be cleared and transferred to 'OLD' register. |
| 2.14. |
EM 3000 Meter does not have the printer. Why ? |
| 2.14.1. |
Mainly to make the Meter light and compact. Also to avoid mechanical problems that are associated with paper, printer etc. However, the EM 3000 Meter can be connected in a network with ueLAN/ eLAN software (ueLAN, eLAN software development, customisation, commissioning, training to the customer personnel are done by Schneider Electric Conzerv), which is connected to a computer and a printer. |
| 2.15. |
How do I determine the system type for set-up programming ? |
| 2.15.1. |
Please see the table below to determine the system type for setup programming. |
| Connected signals |
Set up system type |
Comments |
| Vr |
Vy |
Vb |
Vn |
Ir |
Iy |
Ib |
|
|
| Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Star 3E,
4V3A |
For 3 Element (Wattmeter) measurement of all 4 wire systems (with Neutral). |
| Yes |
Yes |
Yes |
Gnd |
Yes |
Gnd |
Yes |
Delta 2E,
3V2A |
For 2 Element measurement of 3 wire systems with no Iy CT. Iy is computed. |
| Yes |
Yes |
Yes |
Gnd |
Yes |
Yes |
Yes |
Delta 2E,
3V3A |
3 wire systems with Iy CT. |
| Yes |
Yes |
Yes |
Gnd |
Yes |
Yes |
Yes |
Delta 3E,
3V3A |
3Element measurement of 3 wire systems where phase to phase Power is important. But accuracy is less than Delta 2E, especially if the system is highly (>10%) unbalanced. |
|
| 2.16. |
Does this Meter require any kind of maintenance? |
| 2.16.1. |
As there are no moving parts in the Meter no maintenance is required. However the Meter should be mounted in a dry, dust free location, away from heat sources and strong electromagnetic fields. It is recommended that the calibration of the Meter be verified once in a year (at Schneider Electric Conzerv Service Centre in Bangalore). |
| 2.16.2. |
The following conditions also should be met : - |
| 2.16.2.1. |
Storage temperature : -20ºC to 70ºC |
| 2.16.2.2. |
Operating temperature : 0 to 50º C |
| 2.16.2.3. |
Relative Humidity : 5 to 95% non-condensing. |
| 2.17. |
I have EM3000 Meter of class 0.5 accuracy. The permissible error indicated in Test and Calibration certificate does not match to the accuracy class claimed. How the permissible error is calculated? |
| 2.17.1. |
The chart below gives details of accuracy definition and method to calculate permissible error. |
| Meter Model |
Class of accuracy |
Permissible error definition |
How this is arrived at |
Standard conforming to |
| EM 3000 series |
1.0 |
+/- (0.2 % of Full scale+0.8% reading+1 digit) |
Eg :+/-49 counts for full scale of 800.0 KW/KVA and reading at 400.0 KW/KVA. |
CBIP 88 |
| 0.5 |
+/- (0.1 % of Full scale+0.4% reading+1 digit) |
Eg :+/-25 counts for full scale of 800 KW/KVA and reading at 400 KW/KVA. |
CBIP 88 |
| 0.2 |
+/- (0.05 % of Full scale+0.15% reading+1 digit) |
Eg :+/-11 counts for full scale of 800 KW/KVA and reading at 400 KW/KVA. |
CBIP 88 |
|
| 2.18. |
Note : - Full scale is given by : Root 3 * Vpri * Ipri. |
| 2.18.1. |
Eg.: 1. The Meter is programmed to PT Ratio : 0.415kV/415V, CT Ratio - 500A (5A or 1A is factory configured, as ordered), then the full scale in kW = 1.732* 415* 500/1000 = 359.39 kW. |
| 2.18.2. |
The Meter is programmed to PT Ratio - 33kV/110V, CT Ratio - 500A (5A or 1A is standard as ordered), then the full scale in kW = 1.732* 33* 500 = 28578 kW. |
| 2.18.3. |
For digital readouts error is calculated in counts. |
| 2.18.4. |
Eg : Full Scale of 359.39 kW corresponds to 35939 counts (ignoring decimal point). |
| 2.19. |
Can I use this Meter for 1 phase measurement ? |
| 2.19.1. |
Yes. See the connection diagram below. |
| |
Single phase 2 wire LT systems with direct Voltage connections (Voltages less than 340VAC-L-N) |
|
| 2.19.2. |
Note 1 : With a direct voltage connection (no PTs), program Vsec=Vpri. Typically, Vpri=0.415kV, Vsec=415V. |
| 2.19.3. |
Note 2 :For V and A, the "r" phase value should be viewed. Avg V and Ah (INTEG) will be 1/3 the correct value. All the remaining parameters will be measured correctly. |
| 2.20. |
Is EM3000 meter suitable for power systems with harmonics? |
| 2.20.1. |
Yes. EM3000 family Meters are especially suited for such applications. This Meter also feature Total Harmonic Distortion (THD) measurement phase wise for voltage and current. |
| 2.20.2. |
Under severely disturbed waveforms, it is recommended a filter/UPS for the auxiliary supply terminals (not the voltage Vin terminals), to prevent damage to the Meter. |
| 2.20.3. |
For critical harmonic applications, we have the sophisticated AR5 palm-top Harmonic Analyser that can measure and log even individual harmonics (see product leaflet). |
| 2.21. |
Can this Meter be installed in the horizontal plane? |
| 2.21.1. |
Yes. This Meter is not sensitive to mounting orientation. However horizontal surface are more susceptible to damage and appropriate protection could be provided such as a glass lid or cover. |
| 2.22. |
Can 100Volts auxiliary be supplied instead of the standard 110Volts ? |
| 2.22.1. |
Yes. The 110Volts auxiliary supply already accommodates a range of 90 to 130 Volts. |
| 2.3. |
What is Time Of Use (TOU) |
| 2.3.1. |
Time of Use or Time of Day (TOD) is a structure, which indicates logging of Intg. Parameters (VAh, VARh, Wh) and Max demand in different time slots (under a variety of electricity rate schedule) and Demand control for week days, week end and Public holidays for an Industry |
| 2.4. |
What are the advantages of Implementing TOU system? |
| 2.4.1. |
The TOU tariff is designed by Electricity Board to encourage large consumers of electricity to use more during the off peak period when unit cost of electricity is cheaper |
| 2.5. |
What are all options of TOU feature available in EM3000? |
| 2.5.1. |
In a year, max 6 seasons and 10 public holidays |
| 2.5.2. |
In a season, any 3 max week end, rest as week days |
| 2.5.3. |
In a day, Max 8 tariff timings and 8 sub-integrators |
| 2.6. |
What is an Integrator? |
| 2.6.1. |
A Integrator consist of VAh, VARh, Ah, PF Avg, V Avg, F avg, Run Hours and Max Demand |
| 2.7. |
How many Integrators are available in EM3000? |
| 2.7.1. |
With TOU feature, there are 9 integrators. In which one main integrator which runs for a day long and 8 sub-integrators which run as per TOU settings |
| 2.7.2. |
In addition to this there are 8 UL and LL for each slot in a day, which can be activated as per TOU settings. The option is only available in EM3460 |
| 2.8. |
How we can do TOU setup? |
| 2.8.1. |
TOU tariff timings, Sub-Integrator configuration can be done by PC |
| 2.8.2. |
DM Control limit configuration can be done by either PC or EM3000 front panel |
| 2.9. |
When we have to redo the TOU setup? Or when TOU setup will get expired? |
| 2.9.1. |
When EB changes their TOU tariff timings and tariff |
| 2.9.2. |
When public holidays have local holidays like Diwali Dasara (in India) etc., |
| 3. |
Adding new features |
| 3.1. |
RS 485 serial communication port. |
| 3.1.1. |
Can be retrofitted to the existing meter at extra cost. This can be done at Customer Support Center, Bangalore. |
| 3.2. |
Inclusion of Import/Export option |
| 3.2.1. |
Can be included to the existing meter at existing cost. This can be done at Customer Support Centre, Bangalore. |
| 3.3. |
Fitting into a portable case. |
| 3.3.1. |
Can be included to the existing meter at extra cost. This can be done at Customer Support Centre, Bangalore. If required, we also provide Clamp ON CT's, Fused Voltage probes and connecting leads at additional costs. |
| 4. |
Upgradation - |
| 4.1. |
Upgradation to new software version |
| 4.1.1. |
Latest software version of the meter is 5.03.04 released in Nov 2001. Software version earlier to this can be upgraded at Customer Support Centre, Bangalore at nominal cost. Contact nearest Schneider Electric Conzerv contact point to know the latest version of software. |
| 4.2. |
Upgradation to higher accuracy class |
| 4.2.1. |
Class 1.0 Meter can be upgraded to class 0.5 at Customer Support Centre, Bangalore at cost. |
| 4.2.2. |
Class 1.0 and Class 0.5 Meters cannot be upgraded to class 0.2. Because, EM3000 class 0.2 Meters need different set of hardware and software. |
| 5. |
Problem observed after few days/months |
| 5.1. |
Display of the Meter does not get ON. |
| 5.1.1. |
See the point no. 2.3 above |
| 5.2. |
Meter displaying "Errxxx". |
| 5.2.1. |
The meaning of each error is explained below. |
| Err code |
Meaning |
Action |
| Err 66 |
Data back-up circuit renewal required. Approximately four weeks of normal operation remain before data is lost on auxiliary supply failure. |
Contact Schneider Electric Conzerv for service. |
| Err 128 |
Fatal setup error. |
Repeat Full setup. System will restart with all data cleared. |
| Err 131 |
Calibration out of spec. Press [CLR] key to acknowledge error and continue operation with reduced accuracy of up to +/-5%. |
Contact Schneider Electric Conzerv at the earliest for re-calibration. |
| Err 130-133 |
Non-recoverable Integrator error. |
[CLR] acknowledges error and clears Integrator. |
| Err 134 |
Non-recoverable Integrator error. |
[CLR] acknowledges error and clears OLD register only. |
| Err 135 |
Non-recoverable Profile error. |
[CLR] acknowledges error and clears Profiles. |
| Err150 |
Improper selection of Electrical System. |
Re-enter the Full setup Menu and correct the first two items (Star/Delta, 4V3A/3V3A). |
| Err151-153, 162-165 |
Sampling Short Cycle error May occur very rarely at severe disturbance or if operated at temperature extremes. If this occurs very frequently even under proper operating conditions, then loss of data, reduced accuracy and possible damage are indicated. |
Contact Schneider Electric Conzerv for service and re-calibration. |
| Err158, 159 |
Improper procedure warning. Typically occurs when the calibration procedure is not being correctly followed. May also take place if entry to the Full setup menu is attempted while the unit is still wired to the panel. |
Try Full setup entry connecting only auxiliary supply to the meter. |
| Err166 |
Suspected hardware problem. |
If this recurs, contact Schneider Electric Conzerv for service and re-calibration. |
|
| 5.3 |
am using a Smart Demand Controller EM3460 but this Meter has failed to record/ trip when demand exceeded the contract demand. Why? |
| 5.3.1. |
The following possible causes to be checked and corrected if found incorrect. |
| 5.3.2. |
The control outputs of EM3460 is not connected /wired to circuit breaker trip coil and alarm circuit. |
| 5.3.3. |
The maximum demand set in EM3460 is higher than the actual max. demand of the factory. |
| 5.3.4. |
The kVAh of EB Meter and our meter should match within 1% (typically 200 to 300 counts). If it does not, EM3460 installation itself is incorrect . Please check the following : |
| 5.3.5. |
The configuration programmed (Delta 2E, Star3E etc ) in EM3460 meter or in EB meter may be wrong with respect to the actual configuration of the electrical system at site. |
| 5.3.6. |
The Vpri, Vsec and Apri and Asec values on EB meter and EM3460 meter should approximately match (but for the cable/line losses and transformer losses if EM meter is on LT side). |
| 5.3.7. |
The CT ratio of EB meter and EM meter may be widely different and these two meters may be operating at two extreme load conditions with respect to the CT pri(one meter at a load of 10% of CTpri and other meter at a load of 50% or more of CTpri). |
| 5.3.8. |
The accuracy class of EB meter may be different from EM3460. |
| 5.3.9. |
Also, additional loads may be connected on HT side/LT side directly or in other circuits which EM3460 measurement may not include (connected to ) these loads, where as these loads would be measured by EB meter. Hence two sets of meter are subjected to different amount of loads causing to record different demand. |
| 5.3.10. |
EB meter may be out of calibration or defective, which may be verified by connecting EM3460 paralally (Voltage in parallel and current in series) and also by verifying the calibration validity date of EB meter. |
| 5.3.11. |
Program upper limit at least 5% lower than the sanctioned maximum Demand of the site. |
| 5.3.12. |
If kVAh of EB meter and EM 3460 match as above, where as demand does not, then please check the following; |
| 5.3.13. |
The Demand period of EB meter and EM3460 meter should match |
| 5.3.14. |
Is EM3460 set for Auto Sync, which is preferable. Else if set to user sync, (only applicable to software version 5.01.01 and above), then user is responsible for continuous synchronisation of Demand interval with EB meter, especially after every power failure. If EB meter set for 30 minutes Demand but checking the demand of 3*10 minutes interval, is actually meaning 10 minute Demand. |
| 5.3.15. |
Ensure that the Demand PAR (kVA/kW) is same in EB Meter and EM3460. |
| 5.3.16. |
EM3460 may be connected on LT side as against EB meter which would be on HT side and the location of EM3460 may be far away on the down stream with respect to EB meter and therefore transformer and cable losses will not be accounted in EM3460 where as the same would be accounted in EB meter. |
| 5.3.17. |
The Real Time Clock (RTC) of EB meter and EM meter may not be matching and therefore the two meters may not be synchronised. To match the EM meter with EB meter, program the EM meter in Sliding window mode. See QSG for details. |
| 5.3.18. |
The appropriate relay outputs (UL > DM) of EM3460 may not be connected to the Main In-comer Circuit Breaker trip coil. |
| 5.3.19. |
The fuses in circuit breaker trip coil may be ruptured and requires replacement. |
| 5.3.20. |
If the Maximum Demand of EB meter and EM3460 meters are reset at different point of time can cause the demand exceed the limit but EM3460 may not give the trip/alarm output. When EB meter MD is reset, if EM3000 meter is not reset within the first Demand cycle ends and the EB demand may be exceeded in this period. |
| 5.4. |
Readings/ Values shown are low / high |
| 5.4.1. |
Go to V (Voltage) using PAR key and press MORE key to check the values of phase - phase (P-P) phase - neutral(P-N) |
| 5.4.2. |
P-P, P-N values should be as per the programmed values in PT Primary / Secondary. |
| 5.4.3. |
Eg. In LT case P-P is 415 V and P-N will be 240 V and in HT case P-P is 11kV and P-N will be 6350 Volts or 6.350 k Volts. |
| 5.4.4. |
If the readings are not correct, check Voltage Input (Vin) supply fuse might be blown off in any one or all the phases. Find out the cause for blown fuse, correct the defects and then change the fuses. |
| 5.4.5. |
Check for loose connections. Tighten the screws at meter and fuse output. |
| 5.4.6. |
Check for neutral connection is made to the meter in case of LT. |
| 5.4.7. |
Go to V (Voltage) using PAR key and press MORE key to check the voltage angles |
| 5.4.8. |
Check the sequence. Correct sequence condition is R-0˚, Y - 120˚, B = 240˚. |
| 5.4.9. |
If sequence is interchanged, values will not be in the above said order. Connect it properly to get the correct sequence. Voltage connection form the R phase of Panel bus bar to be connected to Vr (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done. |
| 5.4.10. |
Go to A (Amps) mode using PAR key and press MORE key and Check the current values phase wise |
| 5.4.11. |
Values shown should be according to the programmed parameters in CT Primary. CT secondary is Factory set. Check rear side of the meter for CT secondary you have ordered. (it could be either 1 or 5 amps). |
| 5.4.12. |
Check for possibilities of panel CT failure in any one or all phases. |
| 5.4.13. |
Check panel CT output and replace if faulty. |
| 5.4.14. |
Check loose connection in the terminals. Tighten terminals in the meter and CT side. |
| 5.4.15. |
Check the connections at the selector switch if the CT is used for any other meter (instrumentation purpose). |
| 5.4.16. |
Go to Amps using PAR key and press MORE key to check the current phase angles. If the current polarity is reversed phase wise KW readings will be shown in -ve. |
| 5.4.17. |
If the polarity or sequence is interchanged the current angles will give incorrect degree values, this can be uniform or random if any one or all the phase is interchanged. |
| 5.4.18. |
Ensure always the correct sequence and polarity connections. |
| 5.4.19. |
It is recommended to check the voltage angle sequence prior to correcting the current angles. |
| 5.4.20. |
Eg : In EM 3000 series the correct Current angle will be between 1 to 15˚ (without any signs) under lag 0.75 to unity PF conditions. |
| 5.4.21. |
Check the CT loading and recommended CT selection for accurate readings.** |
| 5.4.22. |
As the meter connected is visible by the readings it display, but the factors influence the accuracy of the reading is dependent on correct selection of CT size, accuracy etc. |
| 5.4.23. |
Ensure that the CT to be put in use for measurements is of correct size in terms of load factor. Considering future expansions one can opt for CT's with dual selection. It is always advisable to select such CT's if the initial loading is very low or less than 10% of full load conditions. As any CT tends to give accurate outputs only when the loading factor is > 10% of CT ratio selected. |
| 5.4.24. |
Make marks with correct polarity and phases, before connecting to the meter terminals from the fuse / CT end to the meter. |
| 5.5. |
Integrated values automatically resetting with out manual resetting. |
| 5.5.1. |
Check the duration/ time frame of the auto resetting. |
| 5.5.2. |
Since there were around 8 integrated parameters in EM 3360 and 9 in EM 3480/ EM 3460, the auto-resetting take place when there is overflow in any of the 8/9 integrated parameters and this is dependent on the Full scale of CT/PT ratios programmed in the meter. This could take place only if the Meter is not resetted for the period over 120 days provided Vin is continuously connected. |
| 5.5.3. |
If the Integrator is not manually cleared, it overflows after some months. Schneider Electric Conzerv's eLAN PC software reports automatically take this into account, so eLAN users need not worry. Whenever the INTEG is cleared, whether manually or automatically, its contents are transferred to the OLD register for your convenience. However, OLD will contain only one set of values. OLD is not useful once you have eLAN. |
| 5.5.4. |
It is recommended to manually reset the integrated values once in a month or 30 days. If the resetting of the values takes place very frequently (before 120 days), please call on your nearest Schneider Electric Conzerv engineer/ service center. |
| 5.6. |
Instantaneous values matching, but integrated values does not match |
| 5.6.1. |
Same as 5.4 above |
| 5.7. |
Two or group of meters compared and readings/ values not matching |
| 5.7.1. |
If the difference is between 2 to 10 % |
| |
- Losses in distribution cables
- Use distribution cables of recommended specifications.
- Do not to use broken wires, wire lengths should be as minimum as possible to minimize the losses.
- Transformer losses - There is no correction actually possible but wise to operate at suitable load bands which gives high efficiency.
- Accuracy of reference meter used for comparison.
- The reference meter should have accuracy at least 5 times better than the Meter Under Test (MUT). It should be connected to the same signals as MUT. The reference meter should have valid calibration.
- Different sampling rate and updation frequency of reference meter and MUT.
- If the updation frequency of the display is different for 2 sets of meters, measurement errors are likely, as the readings recorded could be different at different point of time.
- Different Multiplication Factor (MF) for reference meter and MUT.
- Different multiplication factors in 2 sets of meters could cause additional error in readings.
- In-correct programming of reference meter or MUT.
- This will result in wrong readings in the meters. Ensure reference meter and MUT have correct programming.
|
| 5.7.2. |
If the difference is between 11-35% |
| |
- Current sequence of one phase at Meter Iin terminals may be reversed.
- Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- Interchange of S1, S2 connection of one Current phases at Meter Iin terminals.
- Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- Meter is operating at below 5% load of Full scale.
- Ensure that the load is above 5% of Full scale.
- Meter is operating at poor PF approx. below 0.5.
- Improve the system PF to above 0.5.
- Voltage signals not present at Vin terminals of the Meter in one phase after making the wiring connections.
- Ensure that the voltage signals are present at all phases at Vin terminals of the Meter. Check for ruptured fuse/connections of broken wires/ loose contacts etc.
- Current signals not present at Iin terminals of the Meter in one phase after making the wiring connections.
- Ensure that the current signals are present at all phases at Iin terminals of the Meter. Ensure no broken wires
- connections/no loose connections.
- Panel CT Ratio and Meter CT Ratio are not same.
- Ensure that the panel CT ratio and Meter CT ratio are same.
- Ex : Panel CT ratio is 500/5A and Meter CT ratio should be 500/5A. In case of EM3000/EM6400 meters should be programmed for PT/CT ratio matching system ratios.
- Panel PT Ratio and Meter PT Ratio are not same.
- Ensure that the panel PT ratio and Meter PT ratio are same.
- Ex : Panel PT ratio is 11kV/110V and Meter PT ratio should also be 11kV/110V.
- Grounding is not done correctly.
- Proper grounding of Neutral of the panel.
- Proper grounding of Neutral of the PT (if applicable)
- Proper grounding of Earth of the panel.
|
| 5.7.3. |
If the difference is between 35-65% |
| |
- Current sequence of two phase at Meter Iin terminals may be reversed.
- Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- S1, S2 connection of two Current phases at may be interchanged at Meter Iin terminals - Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- Meter is operating at below 5% load of Full scale
- Ensure that the load is above 5% of Full scale.
- Voltage signals not present at Vin terminals of the Meter for one or more phases after making the wiring connections.
- Ensure that the voltage signals are present at all phases at Vin terminals of the Meter. Check for ruptured fuse/connections with broken wires/ loose contacts etc.
- Current signals not present at Iin terminals of the Meter for one or two phases after making the wiring connections.
- Ensure that the current signals are present at all phases at Iin terminals of the Meter. Ensure no broken wires connections/no loose connections
|
| 5.7.4. |
If the difference is above 85% |
| |
- Current sequence of two or more phases at Meter Iin terminals may be reversed.
- Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- S1, S2 connection of two or more Current phases at may be interchanged at Meter Iin terminals.
- Panel R phase CT wiring to be connected to Ir with correct polarity (R phase of Meter) terminal on the meter. Similarly for Y and B phase also to be done.
- Current signals not present at Iin terminals of the Meter for one or more phases after making the wiring connections.
- Ensure that the current signals are present at all phases at Iin terminals of the Meter. Ensure no broken wires connections/no loose connections.
- Also see 5.6 to 5.7 above
|
| 5.8. |
Demand not matching (Applicable for EM 3480 and EM 3460 models only) |
| 5.8.1. |
Check the Voltage, current inputs. Refer as per point no. 5.3 |
| 5.8.2. |
If comparison is made the EB meter with that of our meter, then check installation conditions like. |
| 5.8.3. |
Location of meter fixed either at HT or LT side. (Indoor or outdoor) Normally EB meters fixed at outdoors. |
| 5.8.4. |
Accuracy level of the meters |
| 5.8.5. |
Accuracy/ regulation of PT/ CT's. |
| 5.8.6. |
Accuracy of meter is computed as per the accuracy claimed for the products |
| 5.8.7. |
Note the atmospheric Temperature. The operating temperature can affect the meters accuracy, if operated beyond the specified limits. See product catalog for technical specifications |
| 5.8.8. |
Use Proper and correct cable size for connecting the meter inputs to CT/PT terminals as per electrical standard. |
| 5.8.9. |
Panel CT Ratio and Meter CT Ratio are not same. |
| 5.8.10. |
Ensure that the panel CT ratio and Meter CT ratio are same. |
| 5.8.11. |
Ex : Panel CT ratio is 500/5A and Meter CT ratio should also be 500/5A. In case of EM3000/EM6400 meters should be programmed for PT/CT ratio matching system ratios. |
| 5.8.12. |
Check correct system type is selected in the Meter Viz. Delta/Star, 2CT/3CT etc. |
| 5.8.13. |
Check the last calibration of the Conzerv meter. See the Test and Calibration certificate issued along with the Meter. |
| 5.8.14. |
If the Meter is not calibrated for more than 4 years slight drift in the readings are likely. It is recommended to get recalibrate and upgrade to latest software version to have better accuracy. Send to Schneider Electric Conzerv Customer Support center for this. |
| 5.8.15. |
Go to partial set up mode (see Quick Start Guide for details) and check the demand interval programmed in the meter. |
| 5.8.16. |
The meter should be programmed for the demand interval as fixed by Electricity Board, which supplies power. If correction required go to Full Setup mode. See Quick Start Guide (QSG) for detailed procedure. |
| 5.9. |
Demand not recording |
| 5.9.1. |
Check the meter program for minimum current sensing levels. |
| 5.9.2. |
The default sensing current level is 0.15%. This can be viewed in programming mode as St%. If minimum level is changed the possibility of demand not recording under lesser loading conditions. Change it to default condition. See Quick Start Guide (QSG) for details how it can be changed. |
| 5.9.3. |
Check the polarity and sequence of the CT/PTs |
| 5.10. |
Alarm continuously ringing |
| 5.10.1. |
Check the contactor / potential free relay outputs through which the alarm is connected. |
| 5.10.2. |
Always recommended to use genuine make contactors for connecting to the output of the demand controller potential free output. |
| 5.10.3. |
If contactor is faulty replace with good one. The alarm relay will be activated once the demand levels crosses the upper limit (UL) programmed in the meter. |
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