User manual MERLIN GERIN TH

[. . . ] 13) b ensure it has a 5A secondary b ensure it has a power rating greater than 5 VA b connect the varmetric controller in series with the existing circuit. If a CT has to be fitted: b the current transformer must be fitted 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 b ensure it has a 5A secondary b ensure it has a power rating greater than 5 VA. DB108782 DB108778 Electrical connections Fig. 13: Installation electrical diagram. . Fig. [. . . ] 14) b ensure that phase L1 of the capacitor bank is connected to the busbar fitted with the CT (Fig. 14) b connect the cables from the CT to the terminal block, S1 to terminal K and S2 to terminal L (Fig. 15: connection of CT to terminal block. DB110511 Earth connection (Fig. 16) The capacitor bank must be earthed using the terminal intended for this purpose. Load shedding The terminals marked 1L3 and 2L3 are linked using jumper A. To be able to shed load, replace the jumper with one of the installation's normallyclosed contacts (Figs. 16: earth connection: horizontal or vertical. DB110695 Fig. 17: connection of load shedding contact. Fig. 18: terminal block without load shedding. DB110510 Fig. 19: terminal block with load shedding. AAV31918_00 7 Installation (cont. ) Choice of cables DB110532 Power circuit connection DB110531 For an ambient temperature of 40 °C, the temperature inside the cubicle can reach 55°C. Sizing current The connection cables to the power factor correction cubicle must be sized for the following maximum continuous currents Imp: Model Classic Comfort Harmony 135 Hz Harmony 190 Hz Harmony 215 Hz Imp 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). 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 where U = mains supply voltage Q = reactive power U3 of the cubicle DB110597 Fig. Some parameters depend on the installation's characteristics and must be modified on-site during commissioning b target cos (default value = 1) b current transformer ratio in order to display the measured values correctly b 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. Checking correct operation b check that cos corresponds to the required value b if operating on full load, check the switched stepping functions correctly b after several hours' operation, check the temperature in the premises. For a better understanding of the parameters to be defined, refer to the Varlogic RT6 manual. AAV31918_00 11 Commissioning (cont. ) Automatic setting of the C/k value To start the C/k setting process, simultaneously press the UP and DOWN keys. DB108812 DB110549 Setting cos Start the SET menu by pressing the SET key for 3 seconds. AUtO 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 configured 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. Selecting the transformer primary current Start the SET menu by pressing the SET key for 3 seconds. DB108814 DB110550 AUtO Display Select the CT LED using the UP-DOWN keys. Select the transformer primary current value by pressing the SET key. The previously configured CT value is displayed. Choose a value between 5 and 10, 000 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. 12 AAV31918_00 Commissioning (cont. ) 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 b no supply to controller Solutions v check for voltage at the controller's terminals v if there is no voltage reading, check circuit continuity from the source: wiring, fuses, etc. [. . . ] Controller display No display Possible causes b no supply to controller Solutions v check for voltage at the controller's terminals v 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. 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. 14 AAV31918_00 Maintenance DB110696 Personnel protection Each capacitor is fitted with discharge resistors which reduce terminal voltages to 50 V one minute after de-energising. Before carrying out work on the equipment: b remove its power supply b wait until the compulsory discharge time has elapsed b ensure each capacitor has been fully discharged by short-circuiting and earthing the contactor terminals. Discharging the capacitors Fig. 25: on-line break. Warning: refer to the capacitor bank's electrical diagram to identify the coupling mode between the contactor and the capacitor. [. . . ]