Bacharach MGS 400 User Manual

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Bacharach MGS 400 User Manual Manual pdf 20 page image

1100-2294 Rev 1 193.4.3 Relay WiringWARNING: Relays are rated for 0 to 30V AC/DC. DO NOT apply mains poweronto these relays.1. Locate the relevant connections (Relay 1, Relay 2, Relay 3) and remove the terminalblock from the PCBA.Relay Function1 Low Alarm2 High Alarm3 Fault Alarm2. Remove plugs from the corresponding M16 cable glands.3. Using the appropriate cable glands, insert wires into the enclosure.4. Secure the wires in each terminal block and, pressing firmly, reinstall the terminal blockinto the PCBA.5. Remove all excess cable from the housing before securing the cable glands.When configured according to the factory default settings, the relays are de-energized duringnormal operation (not fail-safe). Fail-safe mode can be configured. When configured for fail-safeoperation, relays are energized during normal operation. Fail-safe operation ensures relays aretriggered in cases of power failure at the instrument. In failsafe operation normally open andnormally closed terminals are reversed as indicated by the following table:Terminal Normal operation Failsafe OperationNC Normally Closed Normally OpenCOM Common CommonNO Normally Open Normally Closed3.4.4 Installation of Remote Sensing HeadIMPORTANT: Non standard cable lengths less than 5 meters may be used.Where non standard remote cables are used these must be shielded to complywith EMI regulations.IMPORTANT: Remote sensor is automatically recognized and registered by theinstrument after a power cycle.