Varset Fast

User guide
Low voltage Transient free automatic capacitor banks

DB121391

A3 cubicle

Reception

DB108739
Varset Fast is an automatic capacitor bank in the form of cubicles tted with harmonic lter reactors.

Presentation

Reception of equipment

For all cubicles.

DB108740
@ the addressee is always responsible for the risks and perils of transporting our goods @ we decline all responsibility for missing items or damage attributable to the carrier. If need be, send your complaints by registered mail to the carrier @ make sure there are no missing items and that the equipment has not been subject to a shock likely to have affected its insulation or operation @ check the electrical characteristics indicated on the rating plate correspond to those on the order form @ in the event of a non-conformity, indicate the shipping note reference when submitting your complaint.

Handling

For A3 cubicles.

DB108741

@ unpack the equipment at the place where it is to be installed @ it is preferable to use a forklift truck @ for the A3 cubicle, handle in the vertical position using 2 lifting rings @ to handle A3 bis, A4 and A4 bis cubicles in the vertical position, 4 lifting rings must be used @ avoid shocks and deformation to the equipment.

Storage

@ store the equipment in a dry and well ventilated place that is sheltered from rain, water projections, chemical agents and dust @ storage temperature: -20 C to +45 C.

Warranty

The equipment is factory cabled and inspected.
For A3 bis, A4 and A4 bis cubicles.

AAV48617EN_01.indd

Description
@ @ @ @ _ @ _ _ _ _ @ _ @ @ @ _ _ @
Technical characteristics
voltage, frequency, power, as specied on the rating plate capacitance tolerances: -5, +10 % permissible voltage overload (8 h out of 24 h as dened in IEC 831-1/2): 10 % insulation class: 690 V withstand 50 Hz, 1 min: 2.5 kV ambient room temperature class: maximum temperature: 40 C average temperature over a 24 hour period: 35 C average temperature over a 1 year period: 25 C minimum temperature: -5 C maximum dissipated power: 13 W/kVAr for Harmony cubicles protection degree: IP21D load shedding (normal-standby) colour: sheet steel: RAL 9001 base: RAL 7021 compliant with IEC 60439-1 and IEC 61921.

DB121465

Fig. 1: electrical layout diagram, Harmony cubicles.

Description (cont.)

Sizes and weights (Fig. 2 to 4)

A3 cubicles

DB121466

A4 cubicles

Fig. 2: A3 and A4 cubicles.

A3 bis cubicles

DB121467

A4 bis cubicles

Fig. 3: A3 bis cubicles.

Fig. 4: A4 bis cubicles.

Cubicles dimensions (mm)
A3 cubicles A3 bis cubicles A4 cubicles A4 bis cubicles 2000 2000

1600 2150

600 600

Installation

The ambient air temperature surrounding the electrical cubicle must be within the following limits: @ maximum temperature: 40 C @ average temperature over a 24 hour period: 35 C @ average temperature over a 1 year period: 25 C @ minimum temperature: -5 C. @ place the equipment in well ventilated premises @ check maximum temperature limits are not exceeded when the equipment is in operation (see the ambient air temperature paragraph above) @ make sure the air vents are not covered (minimum space 100 mm) @ ensure the equipment is sheltered from dust and humidity.

Ambient air temperature

Ventilation rules

DB121468

Fig. 6: air ow.

Installation (cont.)

DB121469
The electrical connections are to be made as shown in the electrical diagrams, (page 3, Fig. 1)

Electrical connections

@ current transformer / controller connection cable cross-section: 2.5 mm2 minimum.
Connection of the current circuit
Installation of CT (current transformer)
Fig. 7: installation electrical diagram.
If there is an existing CT: @ ensure it is placed upstream of the installation, capacitor bank included (Fig. 7) @ ensure it has a 5 A secondary @ ensure it has a power rating greater than 5 VA @ connect the varmetric controller in series with the existing circuit. If a CT has to be tted: @ the current transformer must be tted to one phase of the MLVS upstream of the capacitor bank and the loads (motors, etc.) (Figs. 7, 8) P1 to the transformer or source side P2 to the load and capacitor bank side @ ensure it has a 5 A secondary @ ensure it has a power rating greater than 5 VA. @ identify the phase onto which the CT is placed as phase L1 (Fig. 8) @ ensure that phase L1 of the capacitor bank is connected to the busbar tted with the CT (Fig. 8) @ connect the cables from the CT to the terminal block, S1 to terminal K and S2 to terminal L (Fig. 9 and diagram Fig. 1 page 3).

DB121470

CT connection
Fig. 8: 3-phase diagram of CT connection.

DB108755

Earth connection (Fig. 10) Load shedding
The capacitor bank must be earthed using the terminal intended for this purpose.
The terminals marked 1L3 and 2L3 are linked using jumper A. To be able to shed load, replace the jumper with one of the installations normallyclosed contacts (Figs. 11, 12, 13).
Fig. 9: connection of CT to terminal block.
Fig. 10: earth connection: horizontal or vertical.

DB121471

DB110511
Fig. 11: connection of load shedding contact.

DB110509

Fig. 12: terminal block without load shedding.

DB110510

Fig. 13: terminal block with load shedding.

Choice of cables

Sizing current

Power circuit connection

DB108761
For an ambient temperature of 40 C, the temperature inside the cubicle can reach 55 C. The connection cables to the power factor correction cubicle must be sized for the following maximum continuous currents Imp: Model
Harmony 135 Hz Harmony 190 Hz Harmony 215 Hz

1.10 In 1.19 In 1.31 In

Minimum sizing rules not taking into consideration any correction factors: temperature, installation method.
Power factor correction cubicle nominal current: In = Q U where U = mains supply voltage Q = reactive power of the cubicle
Fig. 14: power connection to connection pads (A3 and A4 cubicles). For A4 cubicles, the supply is spread over two columns.

Cross-section

It must be compatible with: @ the ambient temperature around the conductor @ the installation method (trunking, duct, etc.) @ the cable manufacturers recommendations. @ to connection pads (Fig. 14). @ cables connected to connection pads must be tightened to 50 Nm max.

Connection methods

Tightening torques
Commissioning the Prophi quick controller

Setting the controller

DB121396
The power factor controller has been set according to the characteristics of the capacitor bank. The only operations required at commissioning are as follows: @ if applicable, set the required cos @ congure the current transformer ratio.
Setting the controller to standard programming

Key 3 Key 2 Key 1

View of the controller and the conguration keys
The following parameters are available for standard programming: @ cos 1 @ cos 2 @ CT current transformer ratio @ automatic detection @ capacitor power @ regulation sequence @ outputs @ elimination of peaks and troughs.
Example of cos 1 setting.

Step Key Action

Any initial status

DB121397

Display

Comment

DB121401

Press for 2 seconds

DB121472
Transition to automatic mode.

1 pulse

DB121473
Manual standard programming.

DB121474

Generate pulses.
1 or more pulses Until the required parameter is obtained.

6 Or 6

DB121402
1 or more pulses 1 or more pulses Press for 2 seconds Pulse
Select the digit to be changed. Change the value of the digit. Save and return to auto. mode. Proceed to another parameter.
DB121401 DB121401 DB121403
Setting the controller to standard programming (cont.)
To set the other parameters available in standard programming mode, repeat steps 1 to 6 on the previous page. Step 3 allows you to select one of the following parameters:

Parameter

DB121404

Display / Symbol

2 setting
Same procedure as for cos

DB121405

Enter the ratio value.
CT current transformer ratio
For values > 1000, a decimal point and k meaning x 1000 appear (e.g.: ratio = 1000).

DB121455

Automatic detection
Run automatic conguration detection (step / sequence size): Off: no auto. detection 1: step size detection 2: sequence detection 3: 1 + 2.
At the end of the procedure, the angle detected is displayed.

DB121457

Capacitor power
This value is the power of the rst step.

DB121456

Regulation sequence
The rst digit is always 1 and does not appear on the display.

Outputs

DB121458
Enter the number of outputs used by the controller (1 to 12).

DB121459

The min. and max. values are recorded every 15 minutes.
Elimination of peaks and troughs
They can be eliminated (with the exception of temperature peaks, connection time and number of actions per step).
For extended programming that includes other information, see the controller documentation.
Operating performance check
@ check that cos is the required value @ for full load operation, check that each step is enabled correctly @ when the equipment has been in operation for a few hours, check the ambient room temperature.
Note: if an alarm is displayed when the capacitor bank is being commissioned, or the rst few times it is used, see Faults and corrective actions to identify the cause of the alarm.
Faults and corrective actions
The cause of an operating problem when a capacitor bank is commissioned can usually be diagnosed from information given by the controller. If the display is blank, check the voltage across the controller terminals. If no voltage is present, check the continuity of the circuit from the source: wiring, fuse, etc. If the display is blank, but a voltage is present across the controller terminals, replace the controller, as it is damaged. If the controller displays one or more alarms, refer to the controller documentation for the cause of the fault and the corrective action to be taken.

Maintenance

DB121460
The capacitors tted inside the cubicles can be accessed via the front face.
Current circuit maintenance (Fig. 15, 16 et 17)
@ after removing the circuit separator M, bridge CT terminals S1 and S2 (terminal block terminals K and L) with jumper O (there is a risk of damage to the current transformer if the secondary winding is open) @ when the maintenance operation is nished, disconnect the jumper O by removing it and replace the separator M.

Personal protection

@ Each capacitor is tted with discharge resistors that reduce the voltage across the terminals to 50 V one minute after powering down.
Before carrying out any work on the equipment:

Fig. 15

DB121461
@ switch it off @ ensure that the discharge time is observed @ ensure that each capacitor is fully discharged by short-circuiting and earthing the contactor terminals and check with a Voltage Absence Tester (VAT). Caution: refer to the capacitor bank wiring diagram which indicates how to link the contactor and the capacitor.
Discharging the capacitors:
@ single-step line disconnection (Fig. 18). To fully discharge the capacitors, successively short-circuit the terminals (DE), (EF), (FD) and check with a Voltage Absence Tester (VAT) @ double-step line disconnection (Fig. 19). To fully discharge the capacitors, successively short-circuit the following terminals: (D1E1), (E1F1), (F1D1) - (D2E2), (E2F2), (F2D2) and check with a Voltage Absence Tester (VAT).

Fig. 16

DB121462

Checks

Annually: @ the general cleanliness of the equipment @ the ventilation system and lters @ the electrical connection terminals for tightness @ the condition of the handling and protective devices @ the temperature of the area where the equipment is located @ the capacitance of the capacitors Please contact us in the event of a variation of more than 10 % with respect to the rated values for the Harmony capacitor banks.

Safety

All the operations described in this document must be performed in accordance with current

Fig. 17

DB121475 DB121476

Fig. 18

Fig. 19
Schneider Electric Industries SAS
Rectiphase 399 rue de la Gare 74370 Pringy France Tel. : 33 (0)00 Fax : 33 (0)19 http://www.schneider-electric.com http://www.merlin-gerin.com

As standards, specications and designs change from time to time, please ask for conrmation of the information given in the publication.
This document has been printed on ecological paper
Creation: Schneider Electric, Ameg et Hardis Conseil, Sedoc Publication: Schneider Electric Printing: - made in France 12-2008

AAV48617EN_01

2008 - Schneider Electric - All rights reserved

Varset

User guide
Automatic low voltage capacitor banks Panels and cubicles

DB110493

DB110492

C1 panel

DB110495 DB110494

C2 panel

A1 cubicle

A3 cubicle

Reception

DB108739

Varset is an automatic capacitor bank in the form of: @ panels @ cubicles. The cubicles can be tted with harmonic lter reactors.
For all panels and cubicles.

Presentation

@ the addressee is always responsible for the risks and perils of transporting our goods @ we decline all responsibility for missing items or damage attributable to the carrier. If need be, send your complaints by registered mail to the carrier @ make sure there are no missing items and that the equipment has not been subject to a shock likely to have affected its insulation or operation @ check the electrical characteristics indicated on the rating plate correspond to those on the order form @ in the event of a non-conformity, indicate the shipping note reference when submitting your complaint.

Reception of equipment

DB108740

For A3 cubicles.

DB108741
@ unpack the equipment at the place where it is to be installed @ it is preferable to use a forklift truck @ for the A3 cubicle, handle in the vertical position using 2 lifting rings @ to handle A3 bis, A4 and A4 bis cubicles in the vertical position, 4 lifting rings must be used @ avoid shocks and deformation to the equipment. @ store the devices in a dry and well ventilated place that is sheltered from rain, water projections, chemical agents and dust @ storage temperature: -20 C to +45 C. The equipment is factory cabled and inspected. Any modication to the equipment jeopardizes its warranty.

Handling

Storage

Warranty

For A3 bis, A4 and A4 bis cubicles.

AAV31918EN_01.indd

Description
@ voltage, frequency, power, as per rating plate @ rating tolerances: -5, +10 % @ allowable voltage overload (8 h out of 24 h as dened in IEC 831-1/2): 10 % @ insulation voltage: 690 V _ 50 Hz, 1 min withstand: 2.5 kV @ ambient temperature in premises: _ maximum temperature: 40 C _ average temperature over a 24 hour period: 35 C _ average temperature over a 1 year period: 25 C _ minimum temperature: -5 C @ maximum dissipated power: _ 2.7 W/kVAr for Classic cubicles _ 3.1 W/kVAr for Comfort cubicles _ 8.7 W/kVAr for Harmony cubicles @ protection degree: IP31 (apart for the ventilator outlet: IP21D) @ load shedding (normal-standby) @ colour: _ sheet steel: RAL 9001 _ base: RAL 7021 @ compliant with IEC 60439-1 and IEC 61921.

DB110688

Technical characteristics
Fig. 1: electrical layout diagram, Classic and Comfort cubicles.

DB110689

Fig. 2: electrical layout diagram, Harmony cubicles.

Description (cont.)

Sizes and weights (Figs. 3 to 7)

DB110699 DB110701

Fig. 3: C1 and C2 panels.

DB110700

Fig. 5: A3 and A4 cubicles.
Fig. 4: A1 and A2 cubicles.

DB110702

Fig. 6: A3 bis cubicle.

Fig. 7: A4 bis cubicle.

Panel sizes (mm)
C1 panel C2 panel 450 800

500 500

275 275

Cubicle sizes (mm)

A1 cubicle A2 cubicle A3 cubicle A3 bis cubicle A4 cubicle A4 bis cubicle 2000 2000

1600 2150

600 600

DB110543

A: step switching control contactors B: capacitors C: current transformer connection terminal D: control circuit protection fuses E: power cable connection pads F: ventilator depending on power rating G: air vents H: voltage transformer depending on range I: harmonic lter reactors depending on range J: main busbar K: Varmetric controller L: protective circuit-breaker depending on range M: earthing.
Fig. 8: C1 and C2 panels.

DB110498

Fig. 9: A1 cubicle.

DB110500

Fig. 10: Classic or Comfort A3 cubicle.

DB110577

Fig. 11: Harmony A3 cubicle.

DB110578

DB110501

DB110499

DB110497

Components

Installation
The ambient air temperature surrounding the electrical cubicle must be within the following limits: @ maximum temperature: 40 C @ average temperature over a 24 hour period: 35 C @ average temperature over a 1 year period: 25 C @ minimum temperature: -5 C. @ place the equipment in well ventilated premises @ check maximum temperature limits are not exceeded when the equipment is in operation (see the ambient air temperature paragraph above) @ make sure the air vents are not covered (minimum space 100 mm) @ ensure the equipment is sheltered from dust and humidity.

Ambient air temperature

Ventilation rules

DB110694

Fig. 12: air ow.

Installation (cont.)

The electrical connections are to be made as shown in the electrical diagrams, (page 3, Figs. 1 and 2)
@ current transformer / controller connection cable cross-section: 2.5 mm2 minimum.
Connection of the current circuit
Installation of CT (current transformer)
If there is an existing CT: @ ensure it is placed upstream of the installation, capacitor bank included (Fig. 13) @ ensure it has a 5A secondary @ ensure it has a power rating greater than 5 VA @ connect the varmetric controller in series with the existing circuit. If a CT has to be tted: @ the current transformer must be tted to one phase of the MLVS upstream of the capacitor bank and the loads (motors, etc.) (Figs. 13, 14) P1 to the transformer or source side P2 to the load and capacitor bank side @ ensure it has a 5A secondary @ ensure it has a power rating greater than 5 VA. @ identify the phase onto which the CT is placed as phase L1 (Fig. 14) @ ensure that phase L1 of the capacitor bank is connected to the busbar tted with the CT (Fig. 14) @ connect the cables from the CT to the terminal block, S1 to terminal K and S2 to terminal L (Fig. 15 and diagrams Figs. 1 and 2, page 3).
Fig. 13: Installation electrical diagram.

DB108782

DB108778

Electrical connections

CT connection
Fig. 14: 3-phase diagram of CT connection.
Earth connection (Fig. 16) Load shedding
The capacitor bank must be earthed using the terminal intended for this purpose.
Fig. 15: connection of CT to terminal block.

DB110511

The terminals marked 1L3 and 2L3 are linked using jumper A. To be able to shed load, replace the jumper with one of the installations normallyclosed contacts (Figs. 17, 18, 19).

DB108755

Fig. 16: earth connection: horizontal or vertical.

DB110509 DB110510

DB110695
Fig. 17: connection of load shedding contact.
Fig. 18: terminal block without load shedding.
Fig. 19: terminal block with load shedding.

Choice of cables

Sizing current

Power circuit connection

DB110532 DB110531
For an ambient temperature of 40 C, the temperature inside the cubicle can reach 55C. The connection cables to the power factor correction cubicle must be sized for the following maximum continuous currents Imp:
Classic Comfort Harmony 135 Hz Harmony 190 Hz Harmony 215 Hz
1.36 In 1.50 In 1.10 In 1.19 In 1.31 In Fig. 20: power connection to circuit-breakers (A3 bis, A4 bis, A2 Harmony). Fig. 22: power connection to terminal blocks.
Minimum sizing rules not taking into consideration any correction factors: temperature, installation method.
Power factor correction cubicle nominal current: In = Q U

DB110548 DB110597

where U = mains supply voltage Q = reactive power of the cubicle

Cross-section

It must be compatible with: @ the ambient temperature around the conductor @ the installation method (trunking, duct, etc.) @ the cable manufacturers recommendations. @ @ @ @

Connection methods

to circuit-breakers (Fig. 20) to terminal blocks (Fig. 22) to connection pads (Figs. 21, 24) to Polybloc (Fig. 23).
Fig. 21: power connection to connection pads (A1 and A2 cubicles).
Fig. 23: power connection to Polybloc.
@ cables connected to terminal blocks must be tightened to 42 Nm max. @ cables connected to connection pads must be tightened to 50 Nm max. For cables connected to circuit-breakers, refer to the user guide.

DB108761

Tightening torques
Fig. 24: power connection to connection pads (A3 and A4 cubicles). For A4 cubicles, the supply is spread over

Commissioning

Setting the controller The varmetric controller has been congured in accordance with the capacitor banks characteristics. The only operations that have to be carried out during commissioning are: @ target cos setting if necessary @ current transformer ratio conguration. Important: @ if supplied by a summing CT (installation with several incoming transformers), it is the sum of the ratios of the different measurement CTs that must be taken into consideration @ for an installation equipped with a generator set (load shedding), the capacitor bank must be taken out of circuit, by breaking the supply to the controller, before switching to the generator set. See page 7, connection of current circuit.

Commissioning the capacitor bank
When rst energised, the controller will immediately ask you to enter the user language. Choose the desired language using the keys pressing Enter. and then validate by

DB121406

Conguring the Varlogic controller NR6/NR12

Controller front face.

The parameters needed for correct capacitor bank operation are factory set. Some parameters depend on the installations characteristics and must be modied on-site during commissioning @ target cos (default value = 1) @ current transformer ratio in order to display the measured values correctly @ response current (C/K): this value is automatically searched for during the checking phase. The other parameters must not be changed. In particular, the time delay must never be less than 50 s, otherwise there is a risk the capacitor bank will incur serious damage and will no longer be covered by the warranty. @ the MIS.SERV menu must be used to launch the commissioning sequence. The sequence includes the conguration of cos and the transformation ratio, as well as an automatic check that the parameters entered are compatible with the installations actual parameters.
Note : if an alarm appears during commissioning or when rst used, refer to the faults and solutions paragraph to determine its origin.
@ check that cos corresponds to the required value @ if operating on full load, check the switched stepping functions correctly @ after several hours operation, check the temperature in the premises. For a better understanding of the parameters to be dened, refer to the Glossary (Chapter 7) in the controller manual.
Checking correct operation

Commissioning (cont.)

DB108779
Commissioning a pre-congured capacitor bank.
What to do in the event of an error?
Error codes allow a diagnosis to be made and a solution to be found. Refer to chapter 5.4 of the controller manual. After checking the installation, re-launch the MIS.SERV sequence or the commissioning with automatic conguration REG.AUTO sequence. If the controller is not solicited for a long period when a menu is run, it may display the message I FAIBLE To return to the commissioning (MIS.SERV) menu, or any other menu, press required. and then scroll esc through the menus to obtain the one
The parameters needed for correct capacitor bank operation are factory set. Some parameters depend on the installations characteristics and must be modied on-site during commissioning @ target cos (default value = 1) @ current transformer ratio in order to display the measured values correctly @ response current (C/k): this value is automatically searched for during the C/k automatic setting sequence. The other parameters must not be changed. In particular, the time delay must never be less than 50 s, otherwise there is a risk the capacitor bank will incur serious damage and will no longer be covered by the warranty.

@ check that cos corresponds to the required value @ if operating on full load, check the switched stepping functions correctly @ after several hours operation, check the temperature in the premises. For a better understanding of the parameters to be dened, refer to the Varlogic RT6 manual.

DB121407

Conguring the Varlogic controller RT6

DB121408

DB110549
Automatic setting of the C/k value To start the C/k setting process, simultaneously press the UP and DOWN keys.

DB121409

Varlogic NR6
Setting cos Start the SET menu by pressing the SET key for 3 seconds. Display
Use the UP and DOWN keys to select the cos LED. The cos symbol is displayed.
Select the cos setting by pressing the SET key. The previously congured value is displayed.
Choose a value between 0.85 and 1.00 using the UP-DOWN keys.
When the target value is displayed, save it by pressing the SET key. The RT6 then goes back to its normal operating mode.

DB121410

Selecting the transformer primary current Start the SET menu by pressing the SET key for 3 seconds. Display

DB110550

Select the CT LED using the UP-DOWN keys. The CT symbol is displayed.
Select the transformer primary current value by pressing the SET key. The previously congured CT value is displayed.
Choose a value between 5 and 10,000 using the UP-DOWN keys.
Varlogic NR6/NR12 faults and solutions
An operating problem, when commissioning a capacitor bank, can generally be diagnosed from the information supplied by the controller.

Controller display

No display
Possible causes @ no supply to controller
Solutions _ check for voltage at the controllers terminals _ if there is no voltage reading, check circuit continuity from the source: wiring, fuses, etc. _ v the controller has been damaged by a supply overvoltage. Replace the controller _ check the position of the CT in the (low current) installation (1) _ check the short-circuit jumper is present between terminals K-L _ check the CT has been correctly chosen _ replace the CT _ check the position of the CT in the installation (1) _ check the controllers voltage conguration (LL display) _ deactivate alarm A5 _ check the position of the CT in the installation (1) _ check the protection status of the auxiliary circuit _ carry out the C/K automatic conguration again or manually congure the calculated value _ deactivate alarm A1 _ readjust the target cos _ add more capacitors

@ overvoltage

Low (i.e. low current)

@ non-compliant wiring

@ CT oversized or too lower load @ faulty CT
A3 or A5 alarm (abnormal cos ) (capacitive cos )
@ bad connection @ incorrect voltage conguration @ presence of xed capacitor bank(s) with low load levels

Alarm A1 (lack of kVAr)

@ bad connection @ no auxiliary voltage @ incorrect C/K conguration @ target cos @ target cos occasionally not reached too high
@ lack of reative power (undersized capacitor bank)
(1) The CT must be tted on phase L1, upstream of the installation to be corrected. It must be checked that phase L1 at the point the CT is connected corresponds to phase L1 inside the capacitor bank (e.g. by checking that the voltage between these two points = 0).
Faults and solutions for Varlogic RT6

Errors and alarms

The alarm relay is activated if the following errors occur. Overvoltage If the voltage between phases equals or exceeds the pre-dened value (programmable between 185.265 V for 240-275 V and between 320.460 V for 410-480 V), the RT6 waits for 1 minute. If the overvoltage is still present at the end of this 1 minute period, the OVER VOLTAGE LED lights-up. Depending on the programmed overvoltage protection conguration, the RT6 switches all the capacitor steps or continues to achieve power factor correction (refer to chapter 5.9 of the Varlogic RT6 manual). Low power factor When the power factor does not reach the target value, despite having switched-in all the capacitor steps, the low power factor LED lights-up and the alarm relay is activated after 1 minute. Overcorrection If the system is still capacitive despite having switched-out all the capacitor steps, the OVER COMPENSATION LED lights-up and the alarm relay is activated after 1 minute.

Maintenance

Each capacitor is tted with discharge resistors which reduce terminal voltages to 50 V one minute after de-energising. @ remove its power supply @ wait until the compulsory discharge time has elapsed @ ensure each capacitor has been fully discharged by short-circuiting and earthing the contactor terminals.
Before carrying out work on the equipment:
Discharging the capacitors
Warning: refer to the capacitor banks electrical diagram to identify the coupling mode between the contactor and the capacitor. @ on-line break (Fig. 25). To ensure capacitor discharge, successively short-circuit terminals: AB, AC and BC @ break the triangle links (Fig. 26). To ensure capacitor discharge, successively short-circuit terminals: AE, BF and CD.

Fig. 25: on-line break.

Checks
One month after energising, check: @ contactor terminal tightening torques. Each year check: @ general cleanliness of the equipment @ lters and ventilation system @ terminal tightening torques. @ proper working order of switching and protective devices @ temperature in the premises: -5 C to +40 C max @ capacitor capacitance, consult us if the capacitance value has changed by more than 10 %.

DB110697

DB110696

Personnel protection

Fig. 26: break the triangle links.

Safety

All the operations described in this guide must be carried out whilst respecting current safety standards, and under the responsibility of a competent authority.

Maintenance (cont.)

Working on the current circuit

Before starting work

DB109733 DB109734 DB109732 DB109735
Initial state. A: separator B: jumper K: S1 terminal on CT L: S2 terminal on CT

Fig. 27.

Remove the separator from the circuit A.
Use the jumper B to link terminals K and L of the terminal block (terminals S1 and S2 of the CT).

DB109739

Final state.
Warning Risk of destroying the current transformer if the secondary is open-circuit.

After nishing work

DB109737 DB109735 DB109736 DB109738

Initial state.

Fig. 28.
Disconnect the jumper B by lifting it up.

Ret the separator A.

Schneider Electric Industries SAS
Rectiphase 399 rue de la Gare 74370 Pringy France Tel. : 33 (0)00 Fax : 33 (0)19 http://www.schneider-electric.com http://www.merlin-gerin.com N AAV31918EN_01
As standards, specications and designs change from time to time, please ask for conrmation of the information given in the publication.
This document has been printed on ecological paper
Creation: Schneider Electric, Ameg et Hardis Conseil, Sedoc Publication: Schneider Electric Printing: - made in France 12-2008
2008 - Schneider Electric - All rights reserved