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Output Circuits Installation

MS-2/MS-4 PN 51512:B 08/28/02 23

2.4.2 DC Power Output Connections

Resettable 24 VDC power is available on both the MS-2 and MS-4 control panels.

Nonresettable 24 VDC power is available only on the MS-4.

2.4.3 Relays

The MS-2 and MS-4 control panels provide an alarm and fail-safe trouble relay and the

MS-4 also provides a supervisory relay. Each Form-C relay is rated for 2 amps @

30VAC (resistive).

Note that relay connections may be power-limited or nonpower-limited, provided that

0.25” minimum spacing is maintained between conductors of power-limited and

nonpower-limited circuits.

TB1

Figure 2.7 Auxiliary Power

4-Wire Smoke Detector Power (500 mA)

24 VDC filtered, resettable power for 4-wire smoke detectors

can be obtained from these terminals (power-limited)

Nonresettable Power (500 mA) - MS-4 Only

24 VDC filtered, nonresettable power can be

obtained from these terminals (power-limited)

+ - + -

ms-4tb1.cdr

TB5

TB6

TB7

TROUBLE

C TRBL NORM

C NC NO

ALARM

SUPV

C NC NO

Figure 2.8 Relay Terminals

Note: Relay contacts are shown with

power applied to the panel and no active

troubles, alarms or supervisories.

The Trouble Relay is a fail-safe relay

which will transfer on any trouble or

total power failure.

ms4relay.cdr

Fire-Lite MS-2 User Manual

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