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Product Description Circuits
14 MS-2/MS-4 PN 51512:E 01/18/05
Local Piezo Sounder
A piezo sounder provides separate and distinct sounds for alarm, trouble, maintenance
and supervisory conditions as follows:
• Alarm - on steady
• Trouble - pulse 1 second on and 1 second off
• Maintenance - pulse ½ second on and ½ second off
• Supervisory - pulse ½ second on and ½ second off
1.4 Circuits
Input Circuits
Two input IDCs (Initiating Device Circuits) on the MS-2 and four IDCs on the MS-4
provide Style B (Class B) configurations. All IDCs accept I
3
detectors as well as
conventional two-wire smoke detectors, four-wire smoke detectors and normally-open
contact devices.
Output Circuits
• 24 VDC resettable special application power output - 500 mA
• 24 VDC nonresettable special application power output (MS-4 only) - 500 mA
• 24 volt battery charger (up to 18 Amp Hour batteries)
Notification Appliance Circuits
One NAC (Notification Appliance Circuit) Style Y (Class B) on the MS-2
Two NACs Style Y (Class B) on the MS-4
Relays
Alarm Relay
Trouble Relay (fail-safe)
Supervisory Relay (MS-4 only)
Form-C contacts rated 2.0 amps @ 30 VAC (resistive)
1.5 Components
Main Circuit Board
The main circuit board contains the system’s CPU, power supply, other primary
components and wiring interface connectors. Optional modules plug in and are
mounted to the main circuit board.
Cabinet
The backbox measures 14.5” (36.8 cm) x 15.218” (38.65 cm) x 2.875” (7.3 cm) and
provides space for two batteries (up to 7 Amp Hours). Also included is a dress panel
which mounts inside the cabinet.
Transformer Assembly
One 100VA transformer is provided standard with the FACP. An optional second
100VA transformer is available for the MS-4 to provide maximum accessory power.
Batteries
The cabinet provides space for two 7 Amp Hour batteries (larger batteries up to 18 Amp
Hour, require use of a UL listed battery box such as the BB-17F). Batteries must be
ordered separately.