22 Chapter 3 Electrical Installation
APM 300 Integrated UPS Single Module And Parallel System User Manual
6. Connect the system output cables between the UPS output terminals (oA-oB-oC-oN) and the critical load,
and tighten the connections to 50N.m. Ensure correct phase rotation.
Warning
If the load is not ready to accept power on the arrival of the commissioning engineer, ensure that the system output
cables are safely isolated at their ends.
Battery connection
7. For UPS not fitted with a BCB, ensure correct polarity of batter string end connections to the UPS terminals,
that is, (+) to (+), (
–
) to (
–
) and (N) to (N). But do not make these connections before authorized by the
commissioning engineer.
For UPS fitted with a BCB, ensure correct polarity of battery string end connections to the BCB and from the
BCB to the UPS terminals, that is, (+) to (+) and (
–
) to (
–
), but disconnect one or more battery cell links in
each tier. Do not reconnect these links or close the BCB before authorized by the commissioning engineer.
8. Replace the covers removed in step 3, and close the back doors of the cabinets.
Note
After connection, take appropriate measures to seal the cable entry holes.
3.2
Control Cables And Communication Cables
3.2.1
Overview
As shown in Figure 3-3, the bypass module provides dry contact ports (J5
~
J10) and communication ports
(RS485 port, RS232 port and Intellislot port) on the front panel.
J10
J7
RS485 RS232
Intellislot 1
Intellislot 3
J8
J5
J6
J9
J10 J7
RS485 RS232
Intellislot 1
Intellislot 3
Intellislot 2
Figure 3-3
Dry contact ports and communication ports
The UPS accepts external signalling from voltage-free (dry) contacts connected to push-in input dry contact
terminal. Subject to prior software programming, the signalling is accepted by the UPS when relevant
terminals and the +12V terminals are shorted. All control cables must be routed separately from the power
cables and parallel cables, and must be double insulated. For maximum run between 20m and 30m, the
typical control cable CSA should be from 0.5mm
2
to 1.5mm
2
.
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