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6.In order to discharge the DC link capacitors, start once more the inverter on each unit through the screen:
MENU/COMMAND MENU/INVERTER ON
Remark: command INVERTER ON will be enabled only when the inverter voltage of each phase decreases below 7 VAC (about 30 seconds).
Before proceeding to step 7, check on the display panel that the DC link voltage (both polarities) Udcp and Udcn has reached the minimum voltage of 5 VDC (about 30 seconds).
7.Switch OFF the inverter on each unit entering the screen:
MENU/COMMAND MENU/INVERTER OFF
COMMAND MENU
INVERTER ON | * |
INVERTER OFF
INVERTER: U1= 7V
U2= 7V U3= 7V
Frequency = 60.0Hz
Synchronized
Udcp= 5V | Udcn= | 5V | |
Ubp=0V | Ubn=0V | O | |
Charge level | = | 0% |
|
Autonomy | = | 0min | |
|
|
|
|
COMMAND MENU |
|
INVERTER ON |
|
INVERTER OFF | * |
The load is now supplied directly from the mains through the manual switches Q2.
END OF PROCEDURE
WARNING !
The UPS cabinet contains parts electrically live.
Apart from the front door, do not open any other part of the UPS.
NOTE !
With separate mains inputs, it’s possible to disconnect mains rectifier.
Modifications reserved | Page 46/57 |
OPM_LPS_3UO_30K_40K_0US_V010.doc | Operating Manual LP 33 Series 30 & 40 kVA |