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Hardware Installation—Installing the
IFC-1010/2020
The main power supply (MPS-24A or MPS-24AE) provides up to
3.0 amperes of regulated current for operating the system in standby
(non-fire alarm) and up to 6.0 amperes during fire alarms. The MPS-24A
or MPS-24AE contains battery charging circuitry
N18
and a 1-ampere
regulated output for powering four wire smoke detectors. The MPS-24A
or MPS-24AE also provides the filtered, regulated non-resettable 24 VDC
required for powering ACS annunciator modules. If a voltmeter and
ammeter are required on the MPS-24A or MPS-24AE, order the
MPM-2 Main Power Meter.
The MPS-24A or MPS-24AE main power supply must be capable of
powering all internal system devices (and several external types of
devices) continuously during non-fire alarm conditions. Use Table 5 to
determine the non-fire alarm load on the MPS-24A or MPS-24AE output
when primary power is applied. A finite amount of additional current must
be provided by the power supply during a fire alarm condition. For the
MPS-24A or MPS-24AE, use Table 6 to determine the additional current
needed during fire alarms. The requirements for non-fire alarm and fire
alarm current loads cannot exceed the capabilities of the power supply in
either case.
The following paragraphs provide additional information to the
IFC-1010/2020 System Current Draw Calculation table (Table 5).
•
In the IFC-1010/2020 System Current Draw Calculation table
(Table 5), the primary power non-fire alarm current and the primary
fire alarm current columns are not battery calculations. They are
simply current calculations to confirm that the MPS-24A can output
enough DC current to support the IFC-1010/2020 system during
non-fire alarm and fire alarm conditions when operating from primary
power.
•
The word primary refers to the FACP’s primary source of power,
i.e., 120 VAC or 220/240 VAC power. The word secondary refers to
the FACP’s backup batteries (or any other VDC uninterruptable,
regulated power supply Listed for Fire Protective Signaling and
connected in place of the batteries).
Specific columns within Table 5 are further defined as follows:
This column allows the system designer to determine the output current
load that must be supported by the main power supply MPS-24A or
MPS-24AE during a fire alarm condition with primary power applied.
The total current drawn from the MPS-24A or MPS-24AE during a
fire alarm condition cannot exceed 6.0 amperes.
MPS-24A or
MPS-24AE
Main Power
Supply
Primary, Fire
Alarm Current
(amperes)
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