GE Industrial Solutions LP11 924 Series 6 & 10 kVA - Manual (Page 27)

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OPM_LPU_11U_6K0_10K_1US_V010.Doc 26 User manual LP11 924 6 & 10 kVA UPS 1.0
5. The right option slot (14 in Fig.19) at the rear of the unit contains the RPA-card. Before the parallel system can be put
into operation a unique number has to be appointed to each UPS in the system. This can be 0 or 1. Give 0 for the first
unit and 1 for second unit.
- loosen the screws, remove the RPA-card
- set the dipswitch to the appointed number (fig. 18)
- re-install the RPA-card, fasten the screws.
Do NOT install the network cables between the RPA-cards of the units yet!
Rear view of the UPS
DIP switches
RPA Card
Figure 18. Appointing a unique number to each UPS in the system on the RPA card
6. In the UPS many parameters can be set. It is advised to keep the same setting for each parameter in each UPS in the
parallel system. In any case the following parameters are critical and should have equal settings:
- auto restart (on/off, see section 5.4.3)
- output voltage (120/208/220/230/240/277Vac, see section 5.4.4)
- output frequency (50/60 Hz, see section 5.4.4)
It is absolutely required that these parameters are set to the same value. If you’re not sure that the units have equal
settings:
- make sure that the RPA-cards of the units have not been interconnected yet
- make sure that utility power is connected to the UPS
- start each unit individually (see section 5.2), check / change the parameters, and switch the unit off again.
7. Interconnect the RPA-cards of the units, using the network cable that factory supplied. See figure 17 (dotted line). Only
install the cables that were delivered with the UPSs! On the first and the last UPS in the system only one RPA-socket is
used to interconnect the UPSs. A bus terminator must be placed in the other (free) RPA-socket. The required bus
terminators have been delivered with the unit.
4.5.6.2 - NOTES CONCERNING STARTING UP THE PARALLEL SYSTEM
For starting up the system please refer to section 5.2.
After switching on all units the LP11 924 UPSs will show the following display:
AUTORESTART OFF
PRESS ENTER
After pressing the ‘Enter/Reset’ button on one of the units the system will start up. All units will display the standard screen.
The number in the lower right corner indicates the number of the UPS in the system.
LP 6-11U 924
LOAD 40% 2
If the parameters mentioned in section 4.5.6.1 step 6 are not set to the same value the UPS will display the following
screen after start-up:
AUTORESTART OFF
SETTING MISMATCH
In this case check and correct the setting of the parameters as mentioned in section 4.5.6.1, step 6.