HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
12 - 4
Connecting relays to the IRC4 card
USING THE IRC4 CARD
12.3Connecting relays to the IRC4 card
The IRC4 panel has three screw terminals for each of its eight relays. These terminals are as
follows:
• NO – The normally open relay contact
• NC – The normally closed relay contact
• COM – The common relay contact.
The actual behaviour of each individual relay depends on the configuration of the IRC4 card.
For example, a relay can be the configured to be normally energised (NE) or normally
de-energised (NDE).
Using the IRC4 Configurator software, the eight relays of the IRC4 card can be configured to
function as either:
• Eight single-pole double-throw (SPDT) relays
• Four double-pole double-throw (DPDT) relays.
12.3.1 Relay terminology
See 9.4.1 Relay terminology.
12.3.2 Operation of relays
See 9.4.2 Operation of relays.
12.4Configuring the IRC4 card
The IRC4 is used to supplement the on-board (local) relays on the IOC4T and IOC8T cards
when complex logic equations using MPC4 and AMC8 card outputs, and external discrete
signal interface control inputs, are required.
For this reason, some information on the configuration of the IRC4 card is given in the
chapters concerning the MPC4 / IOC4T and AMC8 / IOC8T card pairs.
However, the IRC4 card contains no jumpers and the local relays on the card are configured
entirely under software control, using the IRC4 Configurator software.
NOTE: See 9.13 Assigning alarm signals to relays on the IRC4 card, 10.9 Assigning alarm
signals to relays on the IRC4 card and the IRC4 Configurator for intelligent relay
cards software manual for further information.
15 DSI4 Discrete signal interface control input 4 (control line)
16 GND Chassis ground (return for DB, AR and other DSI inputs)
Connector (serial)
1-9 RS-232 serial port for communication with the IRC4 card
Connector (Ethernet)
Reserved for future use
Table 12-1: Definition of connectors on the IRC4 card (continued)
Terminal Name Definition
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