Shutdown Of A Single Unit In A Parallel System - GE LP 33 Series Operating Manual

8.2.4

Shutdown of a single unit in a parallel system

The purpose of this procedure is to separate one unit from the parallel system.
1. Switch OFF the inverter only on this unit entering the screen:
MENU/COMMAND MENU/INVERTER OFF
Attention: to switch OFF permanently the inverter the key
Enter must be pressed 2 times.
2. Switch OFF the output switch Q1 (0) only on this unit.
3. Perform the command total off only on this unit.
4. Remove the rectifier-input fuses F1, F2, F3 and the battery fuses F9, F10, F11 (remove the external
battery fuses in case of external battery) only on this unit.
5. In order to discharge the DC link capacitors, start once more
the inverter only on this 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 6, check on the display panel that
the DC link voltage (both polarities) Udcp and Udcn has reached
the max. voltage of 5 VDC (about 30 seconds).
6. Switch OFF the inverter only on this unit entering the screen:
MENU/COMMAND MENU/INVERTER OFF
7. Switch OFF the mains power only on this unit at the AC input distribution panel.
WARNING !
In case the unit should be disconnected and removed from the operating system, the
operation must be performed by qualified persons.
If an intermediate unit must be disconnected from a parallel system pay attention
do not open the control bus: keep the plugs J3 and J4 connected to the board "P16 -
Connector adapter RPA" (see Section 4.8.4).
Modifications reserved
OPM_LPS_33E_10K_30K_4GB_V030.doc
END OF PROCEDURE
COMMAND MENU
INVERTER ON
INVERTER OFF
COMMAND MENU
INVERTER ON
INVERTER OFF
INVERTER: U1= 7V
U2= 7V U3= 7V
Frequency = 50.0Hz
Synchronized
Udcp= 5V Udcn= 5V
Ubp=0V Ubn=0V
Charge level = 0%
Autonomy = 0min
COMMAND MENU
INVERTER ON
INVERTER OFF
Operating Manual LP 33 Series / 10-20-30 kVA
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