ABB Switzerland Ltd 1KHW001489-EN ETL600
6.6.3.4. Relay Module R1BC
Eight relays with switchover contact are provided. Each relay or alarm
contact can be switched to any one of three user alarms. Each user
alarm bus can be programmed with HMI600 to respond to a desired
combination of alarm criteria.
All alarm relays in the ETL600 equipment are picked up during a no
fault condition. This is indicated with a dashed line on the alarm
contact. Example: Terminals 1 and 2 of V9MR are closed when no
alarm is present. Terminals 2 and 3 are closed when an alarm is
present. Terminals 2 and 3 are also closed when the power to the
ETL600 is switched off.
Caution
Connecting a load between terminals NO (normally
open) and NC (normally closed) is not allowed.
Use only one contact set NO or NC.
Caution
Power supplies connected to alarm relay contacts
must be short circuit and over current protected.
6-26 November 2005 Assembly and Installation
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