Fault tracing
Contents of this chapter
This chapter contains descriptions of status indicators of the semiconductor switch unit
ACS880-7407LC. It also contains a description of the Fault mode of the DC breaker switch,
and related instructions.
Indicators
Description (when illuminated)
Name
Desig.
DC breaker switch is open.
Yellow indicator
P30.1
DC breaker switch is closed.
Green indicator
P30.2
Fault mode of the DC breaker switch
The DC breaker switch goes into a Fault mode when the DC breaker detects:
• that an environment sensor is out of range
• an overload, and the External trigger input signal is still high (closed circuit)
• an overcurrent, and the External trigger input signal is still high (closed circuit)
• an internal fault.
When the DC breaker switch goes into the Fault mode, it trips (opens). It is not possible to
close the DC breaker switch. To go back to normal operation mode:
1. Eliminate the cause for the fault trip.
2. Close the DC breaker switch with the External trigger input signal: Open the control
circuit and close it again. See
Default control connection diagram (page 26)
.
6
Fault tracing 35
