Siemens SINAMICS G150 Manual page 1428

4 Faults and alarms
4.2 List of faults and alarms
Reaction upon A: NONE
Acknowl. upon A: NONE
F06907 Braking Module internal overtemperature
Message value: -
Message class: Braking Module faulted (14)
Drive object: B_INF
Reaction: OFF2 (NONE, OFF1)
Acknowledge: IMMEDIATELY
Cause: The temperature sensor connected to the braking resistor signals an overtemperature.
The Braking Module is still active. If the overtemperature persists for more than 60 s, fault F06908 is output, and the
braking module is switched off.
See also: r3687 (Digital Braking Module pre-alarm overtemperature)
Remedy: - reduce the temperature at the sensor.
- check the temperature sensor connection.
F06908 Braking Module internal overtemperature shutdown
Message value: -
Message class: Braking Module faulted (14)
Drive object: B_INF
Reaction: OFF2 (OFF1)
Acknowledge: IMMEDIATELY
Cause: Braking module shut down due to overtemperature at the temperature sensor of the braking resistor.
The overtemperature is detected by the sensor for longer than 60 s.
See also: r3688 (Braking Module internal overtemperature shutdown)
Remedy: - reduce the temperature at the sensor.
- check the temperature sensor connection.
F06909 Braking Module internal Vce fault
Message value: %1
Message class: Braking Module faulted (14)
Drive object: B_INF
Reaction: OFF2
Acknowledge: IMMEDIATELY
Cause: In the power unit, the monitoring of the collector-emitter voltage (U_ce) of the power semiconductor to control the
braking resistor has responded.
Possible causes:
- short circuit at the braking resistor terminals
- defective power semiconductor in the braking resistor control.
Note:
Under certain circumstances, this alarm is also output if a braking resistor has not been connected and power is fed
back into the Braking Module.
See also: r3689 (Digital Braking Module Uce fault)
Remedy: - connect a braking resistor.
- check the braking resistor connection.
- check the braking resistor.
- carry out a POWER ON (power off/on).
- replace the unit.
A06921 (N) Braking resistor phase unsymmetry
Message value: -
Message class: Braking Module faulted (14)
Drive object: VECTOR_G
Reaction: NONE
Acknowledge: NONE
Cause: - the three resistors of the braking chopper are not symmetrical.
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SINAMICS G130/G150
List Manual (LH2), 04/2014, A5E03263479A