If the drive ground is removed, the insulation resistance changes from short-circuit to the
system-specific setpoint.
The fault message is acknowledged.
8.6.3
Diagnosis
8.6.3.1
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.
8.6.3.2
Diagnostics via LEDs
LEDs of the Power Stack Adapters
Table 8-4
LEDs of the Power Stack Adapters
LED
Color
Status
Description; cause
Remedy
PWR
-
Off
24 V power supply has failed or is too low
(< 14 V) or internal fuse defective.
Check input voltage.
If input voltage is > 18 V and LED off:
Return component for repair.
Red
Continuous
light
24 V power supply is available (>14 V);
internal board voltage fault.
Check input voltage.
If input voltage is > 18 V and LED red:
Return component for repair.
Green
Continuous
light
24 V power supply OK.
Internal board voltages OK.
--
Operation
8.6 Fault and system messages
SINAMICS SM150 6SL3810-7NN38-0AA1
134
Operating Instructions Rev.201910281406 EXAMPLE
