Installing the Standby-Batteries
Reference Section 3, Installation for installing the standby-batteries.
Replacing Fuses
The Sigma A-CP Fire Control Panel contains a battery fuse, a transformer fuse and an AC input fuse to
protect it against circuit overloads. A 6.3 Amp slow-blow fuse protects the battery charging circuit and
the transformer secondary. A 5 Amp fuse protects the AC input.
Reference Section 1, Installation Wiring, Rechargeable Battery Circuit for more information about the
battery fuse.
Reference Section 1, Installation Wiring, Main Supply Circuit for more information about the AC input fuse.
During the life of the product it may be necessary to replace one or both of the fuses to restore
operation.
Replace a fuse only after diagnosing and replacing components responsible for causing the fuse
failure. Fuse failure is not a condition caused by the fuse. Diagnose and replace components in the
circuit before replacing the fuse and then test the Sigma A-CP Fire Control Panel for proper operation.
Battery Fuse
The following procedures describe methods for removing and installing the 6.3 Amp battery fuse of
the Sigma A-CP Fire Control Panel.
Removing the Battery Fuse
To remove the 6.3 Amp battery fuse:
1
Turn off 115 VAC or 230 VAC at the power source.
2
Disconnect the red-lead of the recharging circuit from the positive terminal of the standby-battery.
3
Remove NAC Power and Power inserts from the fascia terminal strip of the Sigma A-CP Fire Control Panel.
4
Remove the retaining-screw securing the fascia to the cabinet of the Sigma A-CP Fire Control Panel.
5
Open the fascia-door of the Sigma A-CP Fire Control Panel.
6
Locate the fuse housing on the printed-circuit-board.
7
Remove the upper-half of the fuse-housing by grasping and pulling upward at the center of fuse-housing.
8
Remove the battery fuse from the upper-half of the fuse-housing.
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