Relay Operation - Sea-Fire 131-740 Installation Instructions Manual

Compatible Display Panels: "Fire Suppression System Monitor and Engine Shutdown Control"
Part Number
131-460
131-461
131-462
131-463
131-464
131-465
131-466
131-467
3.3.1.5 Multiple Cylinder Supervisory Switch Connection to the MSRS PS1
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3.3.1.6 Engine or Machinery connection
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4

Relay Operation:

This section provides the basic operation of the relays in the ESRS unit.
4.1. Relay Contact Specification
Item
Contact
Contact Current
Contact Voltage VAC (Maximum allowable)
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N/C – Normally Closed Contact
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N/O – Normally Open Contact
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COM – Common Terminal
4.2. Relay De-Energized State
When the MSRS is operational and in the standby mode, all the relays should be in the de-energized state.
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The N/C and the COM terminals are connected.
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The N/O terminal is open.
Display Panel indicators and shape
Power and Discharge Indication, Rectangle
Power and Discharge Indication, Round
Power, Discharge, and High Temp Indication, Rectangle
Power, Discharge, and High Temp Indication, Round
Power, Discharge, and Aux Zone Indication, Rectangle
Power, Discharge, and Aux Zone Indication, Round
Power, Discharge, and Low-Pressure Indication, Rectangle
Power, Discharge, and Low-Pressure Indication, Round
When connecting more than one pre-engineered cylinder supervisory pressure switch to the MSRS Unit,
connect all the supervisory pressure switches in series. Connect the leading switch wire to Terminal
marked "1" and the trailing wire of the last pressure switch to Terminal marked "2" (See Figure 2).
When connecting more than one Engineered System cylinder supervisory switch to the MSRS unit, connect
all the cylinder supervisory switches in series. Connect the leading switch wire to Terminal marked "3"
and the trailing wire of the last pressure switch to Terminal marked "4" (See Figure 2).
When connecting more than one Engineered System discharge pressure switch, reference the engineered
fire suppression manual and electrical circuit diagram provided as part of the system.
Refer to the Original Equipment Manufacturers (OEM) Engine or the machinery Installation manual for the
correct method of connection to relays of the MSRS unit. Equipment manufacturers have a variety of
methods to control their equipment.
The following section provides the basic operation of the relays in the MSRS unit.
Table 1 Relay Contact Specification
Page 5 of 11
Value
SPDT (1 Form C)
10A NC / 20A NO
277VAC
123-652 Rev -