Connecting The Main Power Supply; Connecting Primary Ac Power; Connecting The Secondary 24V Power Source; Earth Ground Fault Detection - Notifier AM2020 User Manual

Table 3.3-1 provides the maximum output capacity of the MPS-24A or MPS-24AE main power supply. Figure
3.3-1 illustrates connections for primary and secondary power to the MPS-24A or MPS-24AE, as well as terminal
and harness connections for the control panel.

Connecting Primary AC Power

With the circuit breaker at the main AC power distribution panel turned off, remove the plastic insulating cover
from Terminal Block TB1 on the MPS-24A and connect the system primary power source. Connect the electrical
system earth ground to TB1 Terminal 2 and ground the power supply assembly to the cabinet with a Chassis
Ground cable (part number 71073) to TB1 Terminal 3. Connect the primary Neutral line to TB1 Terminal 4 and
the primary Hot line (120 VAC for the MPS-24A or 220/240 VAC for the MPS-24AE) to TB1 Terminal 6. Do not
route AC wiring in the same conduit with circuits in this control panel. After completion of these connections,
reinstall the plastic insulating cover over the terminal strip. Leave the main circuit breaker off until installation of
the entire system is complete.

Connecting the Secondary 24V Power Source

Secondary power (usually battery) is required to support the system during loss of primary power. The batteries
may reside in the control panel cabinet, or in a separate BB-55 cabinet. When using a 24 VDC filtered power
source other than batteries, this source must be of sufficient capacity and be listed for this purpose.
Connect the Battery Positive Cable (part number 71071) to TB2 Terminal 1(+) and the Battery Negative Cable
(part number 71072) to TB2 Terminal 2(-). Do not connect the Battery Interconnect Cable (part number 71070)
at this time. This connection will be made just prior to initial system power-up.
NOTE
A separate cabinet may be required to house NiCad batteries due to battery size.

Earth Ground Fault Detection

The MPS-24A or MPS-24AE automatically detects ground faults in the system. To disable ground fault detection,
cut Resistor R27 (refer to Figure 3.3-1).
24V DC Four-Wire Smoke Detector Power
Up to one amp of power for four-wire smoke detectors can be drawn from TB3 Terminals 1(+) and 2(-). Power is
removed from these terminals during system reset. This 24V DC filtered source is power-limited but must be
supervised via an end-of-line Power Supervision Relay (refer to Figures 4.6-5 and 4.6-6).
24V DC Notification Appliance Power
Up to 3 amps of filtered current for powering notification appliances can be drawn from TB3 Terminals 3(+) and 4(-).
Power is not removed from these terminals during system reset. If additional 4-wire smoke detector power is required,
this circuit can be converted to a two-amp resettable circuit by cutting JP5 on the MPS-24A or MPS-24AE (refer to
Figure 3.3-1). This 24V DC power is power-limited but must be supervised via an end-of-line Power Supervision
Relay.
Note: This power supply is UL listed as a Special Application Power Supply. Therefore, only notification
appliances listed in the Device Compatibility Document (15378) should be used with this power supply. (This
restriction also applies to the APS-6R and FCPS-24 power supply.)
System Harness Connections
The Power Harness (part number 71030) provides internal power for circuit boards installed in the ICA-4L.
Connect this harness from P2 or P4 on the MPS-24A or MPS-24AE to Plug A on the uppermost ICA-4L.
The AM2020/AFP1010 monitor the power supply through connection of a Power Supply Supervision Cable (part
number 71031) between MPS-24A or MPS-24AE Connector P3 and Connector P2 on the CPU (refer to Figure
3.6-1). If the MPS-24A or MPS-24AE is being used as a remote power supply, this ribbon cable should be
plugged into the MPS-TR module. The MPS-TR provides a Form-C trouble contact that can be monitored by a
monitor module with an "MTRB" Type ID.
For connection of an MPS-TR, refer to the MPS-TR Product Installation Document listed in the Related
Documentation Chart in the beginning of this manual.
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Installation 15088:J 10/22/99
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