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POWERING TECHNOLOGY
Manual No. MS0027-MAN rev. 4
guardian_access_3u_ms27-man-rev4-0817.indd
4.7 Battery Connection
The battery cables are not delivered with the system.
1. Check that all the battery MCBs are in the OFF position.
2. Connect the “+” cable of each battery string to the positive bus bar of the system. Tighten
the cable terminal to 3.0 Nm.
3. Connect the “-“cable of each battery string the battery circuit breaker. The copper bar
with washer and nut installed on the circuit breaker is used to connect and tighten the
battery cable lug.
4. Connect the other ends of the battery cables to the “-“and “+” terminals of the batteries.
Refer to Table 6-1 in the Maintenance and troubleshooting chapter for correct torque.
Battery 0V
Battery -48 V
Figure 4-12 Battery Connection
4.8 Alarm and Signal Connections
There are three kinds of alarm interface board for selection to meet the user’s requirement.
• PCC External Board: Select this if the PCC internal communication board is selected.
• ACC External Board: Select this if the ACC internal communication board is selected
and a maximum of 4 alarm relay outputs are required.
• ACC Relay Board: Select this if the ACC internal communication board is selected and
5 - 10 alarm relay outputs are required.
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