GB
OPTION FOR INTERNAL RELAY MSA
38 ULTIMA
®
X
3 TM
Appendix C Option for internal relay
C-1. Relay connections
All electrical connections to the internal relays can be made directly on the printed
board (see Figure 4). When connecting the relays to motors, fluorescent lamps or
other inductive loads, it is necessary to suppress any sparks or inductive
feedback that may occur at the relay contact. These effects may damage the
instrument and make it inoperative.
One way to reduce these effects is to install a “Quencharc
®
”, available from MSA
as part number 630413, across the load being switched.
Attention!
Before connecting the cable to ULTIMA
®
X
3 TM
Gas Monitors,
disconnect or isolate , the monitor power source otherwise there is
danger of electric shock.
To connect the relay, the ULTIMA
®
X
3 TM
Gas Monitor must be opened.
Proceed as described below:
(1) Remove the ULTIMA
®
X
3 TM
Gas Monitor enclosure cover.
To enable correct connection of all plugs note there location before
removing them.
(2) Pull the terminal plugs to release them from the now accessible printed
board.
(3) Feed the cable (not included) into the enclosure and connect it to the
appropriate terminal plugs.
(4) Make sure that each cable conductor is connected correctly to ensure proper
functioning of the control unit.
(5) If installing a RESET push-button:
Feed a 2-core cable to the J10 terminal plug (Æ Fig. 3).
To avoid electrical interference due to relay cables, this cable
must only be supplied with DC power.
Connect the 2-core cable to the two connections of the J10 terminal plug.
Identify the cable to allow proper connection at the push-button
Route the cable to the push-button switch and connect the cable to it.
To Next Page
Loading...
Need help?
General
