Oldham MX 52, Installation Manual

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1.3.9. Parking application
CTX50 "Co parking" toxic gas detectors can be fitted in parallel when a mean gas
concentration is to be obtained. The detectors must, imperatively, be located in the same area.
In this case, a maximum of five detectors can be connected (see Fig. 23).
1.4. Connecting the unit to external devices
1.4.1. Slaving controls
The 16 measuring channels of the MX52 unit are each equipped with two relays which can be
used to control external devices: sirens, solenoid valves, extractors, telephone calls, etc..
For each measuring channel, the relays are distributed in the following manner (see Fig. 7):
- a relay associated with the triggering of alarm 1,
- a relay associated with the triggering of alarm 2,
- use of open or closed contacts selected with a jumper (see Fig. 7),
- use of positive or negative safety selected by programming (see the CHANNEL
programming menu),
- contact outputs on the back of the measuring board (see Fig. 12).
- An example of connection is given in Fig. 24:
- a siren connected to relay AL1 will be actuated as soon as alarm 1 is
triggered,
- a solenoid valve connected to relay AL2 will be actuated as soon as alarm 2
is triggered.
For all channels:
- A common relay associated with the triggering of alarm 3 for the 16 channels.
By programming, this common relay can also be used for the remote transmission
of the audio warning signal. (This relay will then be associated with all the unit’s
alarms). The 3 contacts are available back to power supply module (fig 8).
- A fault relay associated with the triggering of channel faults (detector failures,
electrical connections, excessively negative zero, etc.). This relay will always be in
positive safety mode (see Fig. 5). The use of open or closed contacts is selected by
programming on common board.
- Common relay contact outputs on the back of the power module: Fig. 8.
REMARK
Owing to the breaking capacity of the MX52 unit’s relays which is limited to 2 A / 250 V AC
or 30 V DC, external intermediate relays must be used if the devices to be controlled require
high power levels.