Siemens 6SL3825, Operating Instructions Manual, Page: 88 / 146

8.3.1.2 Tripping of the circuit-breaker in case of undervoltage
If a serious fault occurs (e.g. overload in the DC link), the drive is immediately disconnected
from the power supply using the safety shutdown function.
WARNING
Danger to life as a result of residual voltages at the output terminals
This function cannot ensure that the drive stops immediately, nor can it ensure that residual
voltages do not still exist at the output terminals and within the device itself.
High voltages can cause death or serious injury if the safety rules are not observed or if the
equipment is handled incorrectly.
● Always carefully observe the "five safety rules (Page 15)".
The shutdown of the circuit-breaker is triggered by a safety contactor combination.
The plant-side circuit-breaker must be equipped with an undervoltage trip to ensure the wire-
break protection for the circuit-breaker OFF command. If a circuit-breaker OFF command is
issued as a result of an overvoltage trip, the circuit-breaker is switched off so that it is fail-safe.
8.4 Fault and system messages
8.4.1 Indicating and rectifying faults
The drive provides many protection functions. These protection functions protect the drive
against damage in a fault situation. A distinction is made between the following messages:
● Fault
A fault is a message from the drive indicating a fault or other exceptional (unwanted) state.
The cause can be a fault in the drive itself or also an external fault. This fault, for example,
could have been issued by the winding temperature monitoring of the asynchronous motor.
The faults are displayed and can be reported to a higher-level control system. Once you
have eliminated the cause of the fault, you must acknowledge the fault message.
● Alarm
An alarm is the response to a fault condition identified by the drive, that does not result in the
drive being shutdown. Alarms acknowledge themselves. If the cause is no longer present,
the alarms reset themselves automatically.
The converter indicates a fault by displaying the corresponding fault and/or alarm on the
operator panel.
Faults are displayed as follows:
● By illuminating the red LED "FAULT"
Additionally, a note relating to the cause of the alarm is displayed in the status bar of the
operator panel.
Operation
8.4 Fault and system messages
SINAMICS PERFECT HARMONY GH150 6SL3825
88
Operating Instructions 05/2020