Fuses
The Aura Fire Alarm ControlPanel contains fuses to protect it against overloads. During the life of the product it
may be necessary to replace one or both of the fuses. Replace fuses only after addressing the cause which
resulted in the fuse failure.
Battery Lead Fuse on 5.25A Power Supply
Failure of the battery lead fuse will result in a Battery Missing trouble. Verify that the fuse is the problem by
disconnecting the fused-lead from the battery, and measuring the resistance of the lead from end-to-end with
an ohm meter. The resistance should measure less than 1 ohm. If it measures higher, replace the fuse with a
ULlisted slow blow fuse. After replacing the fuse, measure the resistance again. If it still measures higher than 1
ohm, replace the lead. Refer to the Equipment List for fuse part numbers.
Once the replacement is complete, reconnect the lead to the battery terminal and verify the Battery Missing
trouble has cleared.
Refer to Equipment List for parts supporting the assembly and connection of the fuse.
Replacing the Power Supply Fuse
Failure of the power supply fuse will result in a Power Failed trouble. Verify that the internal fuse is the problem
by checking that the proper AC voltage is present across the L & N terminals on the AC-in terminal block of the
power supply.
WARNING! This is high voltage area. An electrical shock hazard exists. Use extreme care.
If the terminals have proper AC voltage and the green AC NORM indicator on the power supply is not lit,
disconnect AC power at the source and replace the fuse.
Replace the power supply fuse by removing it from the fuse housing contained on the circuit board of the power
supply. Install the replacement fuse in the fuse housing and then test the power supply to determine that it
operates. The following figure illustrates the fuse of the power supply:
Removing the Power Supply Fuse
1. Turn off the AC power feed to the fire control panel. It is not necessary to disconnect the batteries.
WARNING! This is a high voltage circuit area. An electrical shock hazard exists in this area when the fire control
Maintenance and Repair
SHIELD Fire, Safety & Security Ltd
Aura Fire Alarm Control Panel Installation Manual
Version 1.00 |June 2019 |MAN-1431VS
Page 99
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