VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
111
3.5.3.
Trip circuit supervision with two digital inputs
•
The first digital input is connected parallel with the trip
contacts (Figure 3.5.3-1)
•
The second digital input is connected parallel with the
auxiliary contact of the circuit breaker.
•
Both inputs are configured as normal closed (NC).
•
The digital input delay is configured longer than maximum
fault time to inhibit any superfluous trip circuit fault alarm
when the trip contact is closed.
•
The trip relay should be configured as non-latched.
Otherwise, a superfluous trip circuit fault alarm will follow
after the trip contact operates, and the relay remains closed
because of latching.
Both digital inputs must have their own common potential.
CB
CLOSE COIL
OPEN COIL
close control
trip circuit
failure alarm
-V
AUX
+V
AUX
-V
AUX
VAMP 257 terminal
Digital inputs
Trip relay
Alarm relay
for trip
circuit failure
relay compartment
circuit breaker compartment
TripCircuitSupervisionFor257with2DI
&
Figure 3.5.3-1. Trip circuit supervision with two digital inputs.
