Woodward High PROTEC MRU4, Руководство пользователя

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Supervision
TCS - Trip Circuit Supervision [74TC]
Available elements:
TCS
The trip circuit monitoring is used for monitoring if the trip circuit is ready for operations. The monitoring can be
fulfilled in two ways. The first assumes only »
Aux On (52a)«
is used in the trip circuit. The second assumes that, in
addition to »
Aux On (52a)
, »
Aux Off(52b)«
is also used for the circuit monitoring.
With »
Aux On (52a)
, only in the trip circuit, the monitoring is only effective when the breaker is closed while if both
»
Aux On (52a)
, and »
Aux Off(52b)«
are used, the trip circuit will be monitored all time as long as the control power
is on.
Note that the digital inputs used for this purpose must be configured properly based on the trip circuit control
voltage. If the trip circuit is detected broken, an alarm will be issued with a specified delay, which must be longer
than the time when a trip contact is closed to the time when the breaker status is clearly recognized by the relay.
In Slot 1 has 2 digital inputs, each of which has a separate root (contact
separation) for the trip circuit supervision.
This Notice applies to protective devices that offer control functionality
only! This protective element requires, that a switchgear (circuit breaker is
assigned to it.
In this case, the trip circuit supply voltage serves also as supply voltage for the digital inputs and so the supply
voltage failure of a trip circuit can be detected directly.
In order to identify a conductor failure in the trip circuit on the supply line or in the trip coil, the off-coil has to be
looped-in to the supervision circuit.
The time delay is to be set in a way that switching actions cannot cause false trips in this module.
526 MRU4 DOK-HB-MRU4-2E