Relay Connections - MSA Ultima X Series Installation & Maintenance Instructions Manual

• Fault Relay PULSED (once per minute) indicates:
• Improper calibration of the Ultima X Series Gas Monitor or
• Ultima X Series Gas Monitor CHECK CAL or
CAL FAULT displayed.

Relay Connections

All electrical connections to internal relays can be made directly on the
pc board (see FIGURE A-1).
If you are connecting the relays to motors, fluorescent lighting or other
inductive loads, it is necessary to suppress any sparks or inductive
feedback that may occur at the relay contact. These effects may render
the unit inoperative. One way to reduce these effects is to install a
*Quencharc ® across the load being switched. This device is available
from MSA as (P/N 630413).
Before wiring the Ultima X Series Gas Monitors, disconnect
power source supplying the monitor; otherwise, electrical
shock or ignition of hazardous gases could occur.
• The Ultima X Series Gas Monitor must be disassembled for
relay wiring. The following procedure must be performed:
1. Remove the Ultima X Series Gas Monitor cover.
2. Pull on the wiring plugs to disconnect the connectors on the
exposed board.
NOTE: Observe connector locations for later re-insertion.
3. Route customer-supplied cable into the enclosure and connect
to the appropriate wiring plugs.
4. Identify each conductor of the cable to enable proper
connection at the control equipment.
5. If installing a RESET push-button:
a. Route a two-conductor cable to terminal block J10
(FIGURE A-2).
" WARNING
A-5