Alarms

Alarms can be enabled or disabled for protection or load shedding.

• When an alarm occurs, an entry is made in the alarm log.

• For a trip unit to activate an alarm, both the pickup level and time delay must be exceeded. Therefore for LSIG protection and advanced protection programmed to trip the circuit breaker, the trip unit will not activate the alarm until the circuit breaker trips. (For example, if a relay is programmed for the long-time pickup Ir, the trip unit will not signal an alarm when the long-time overload indicator lights. The trip unit will only activate the alarm once the long-time overload exceeds the time delay and trips the circuit breaker.)

• Link alarms to a visual or audible signal by programming the optional M2C or M6C module contacts, when an external 24 V power supply is used on the trip unit.

• View alarms by:

  • History logs menu

  • The network system management software

• M2C/M6C contact characteristics:

  • Minimum load of 100 mA/24 V

  • Breaking capacity at a 0.7 power factor

    240 Vac	5 A
    380 Vac	3 A
    24 Vdc	1.8 A
    48 Vdc	1.5 A
    125 Vdc	0.4 A
    250 Vdc	0.15 A

• When several alarms are activated, screen response/refresh time will be slower.

See Appendix B—Default Settings and Tolerances for default and range values.