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Power Supply Fusing:
F-1 – Battery Charging Fuse (AGC 5 Amperes): This fuse passes both the regulated
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and unregulated current when the system goes into battery mode operation. It must
pass current for extinguishers as well as detectors thus it is sized to allow system
operation in event of power disruption.
• F-2 – Regulated Power Fuse (GMA 2 Amperes): This fuse controls the regulated 24
volts DC supplied to the circuit boards and detectors. The 2 amperes rating is the
maximum fuse rating for fuses used in this position. Systems with few detectors
and/or zones can use fuses of lesser ratings. Fuses should always be sized to fit the
application or demand current.
• Primary Fuse (GMA 5 Amperes): The primary fuse is located in the AC line
supplying current to the transformer used in the system. The transformer used and the
system configuration or size predicates its size. This fuse passes the entire AC current
demand for the system through a 5 to 1 step-down transformer when a 120 volts AC
line is used. In addition, this fuse must be sized to blow in the event of transformer
failure and/or bridge filter capacitor failure. Typically, the fuse should be a fast blow
5 amperes maximum fuse for maximum power when using a 4 amperes transformer
(120 volts AC to 24 volts DC). The fuse should have a 1 ampere rating when used
with 240 volts AC to 24 volts DC, 4 amperes transformers.
Argus Installation and Resource Guide
Not applicable to cotton gin uses.
COMPONENTS
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