MSA SUPREMA - Page 33

REV 0, June 2005 Page 33
Operation Manual SUPREMA
3. Description of the System
Function of the Module
• The module is plugged into the rear of the rack.
• It is driven by the MGO module in the rack.
• 8 relays for giving common alarms, i.e., 1
st
alarm, 2
nd
alarm, 3
rd
alarm, 4
th
alarm, failure
horn, inhibit, power supply.
• One changeover contact, connected to screw terminals, is provided for each relay.
• Standard design:
Relay energised = no alarm. The relay is de-energised when an alarm is triggered at one
or more measuring point (normally energised).
• Custom design: (not allowed for relevant safety applications)
Relay de-energised = no alarm. The relay is energised when an alarm is triggered at one
or more measuring point (normally de-energised).
• The relays can be inhibited via the MST module (to prevent alarms).
MRO-8 Module: Relay Assignment
Relay 1: 1
st
Alarm
Relay 2: 2
nd
Alarm
Relay 3: 3
rd
Alarm
Relay 4: 4
th
Alarm
Relay 5: signal failure (sensor)
Relay 6: horn
Relay 7: Inhibit
Relay 8: power supply failure
MRC-TS Module (Relay Connection Module)
This module is used when relay modules separate from the rack are installed on a mounting
rail. An MRC-TS module is used to connect up to 5 TS-Relay modules. The relay power supply
and the ribbon cable, which are required for the control of the relays by the MGO module, are
attached to this MRC-TS module. It is possible to control 5 MRO modules (with alternatively 8
or 16 Relays each). The MRC-TS-module is connected to the MGO-module over a 40-way
ribbon cable (2 for the redundant version) and a rack mounted MUT-module. In the redundant
version each 2 MGO-module are connected via 2 MUT modules and 2 ribbon cables to the
MRC-TS module.
• Connections for the relay power supply (3 x 24 VDC)
• Connections for relay inhibiting
• Bridge (BR1) for the selected type of inhibit (normally energised/normally de-energised)
MRO-8-TS Module (Relay Output Unit: Non-redundant)
This module is provided when not only common alarms but also other messages are required.
Each relay has a changeover contact (230 VAC/3 A). The module makes 8 relays available,
each with its own changeover contact. The relays are controlled by an MGO module, operating
via the MRC-TS module.