LOW HARMONIC CABINET DRIVE
vacon • 55
24-hour s358 (0)201 212 575 • Email: [email protected]
7
7.1.4
Circuit-Breaker TRIP due to overload or short-circuit
The electronic trip unit will open/trip the circuit-breaker in case of an overload or short circuit. The
trip indication contacts of circuit-breakers are connected in series and if one of the circuit-breakers
trips due to an overload or short circuit current, it will automatically open/trip the other circuit-
breakers. The
MCCB FAULT LED
will illuminate and indicate that the circuit breakers are in tripped
state.
Figure 29. MCCB FAULT indicator
In case of an overcurrent situation the fault that caused the circuit-breaker to trip should be
identified and removed before the circuit-breakers can be reset. The MCCB can only be reset by
pressing the push button -S6 when the –S11
REM-MAN-AUTO
switch is in
MAN
position.
Figure 30. MCCB Reset push-button (-S11)
This will reset the circuit-breaker and, at the same time in FR9, FR10 or FR12 solution, recharge
the spring system of the motor operators. After this it is possible to pre-charge and close the
circuit-breakers by methods described in previous chapters.
11510_00
11511_00
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