Motor Terminals Are Not At Zero Potential After Pulse Suppression - Siemens Sinamics S120 Diagnostic Manual

Remedy: Re cause 1:
- an armature short-circuit / voltage protection is only permissible for permanent-magnetic synchronous motors. The
highest position of the motor type in p0300 must either be 2 or 4.
Re cause 101:
- the contactor for the external armature short-circuit configuration should be controlled using output signal r1239.0.
The signal can, e.g. be connected to an output terminal BI: p0738. Before this fault can be acknowledged, p1231 must
be set again.
Re cause 102:
- if the external armature short-circuit with contactor feedback signal (p1231 = 1) is selected, this feedback signal must
be connected to an input terminal (e.g. r722.x) and then connected to BI: p1235.
- alternatively, the external armature short-circuit without contactor feedback signal (p1231 = 2) can be selected.
Re cause 103:
- if the external armature short-circuit without contactor feedback signal (p1231 = 2) is selected, then a delay time must
be parameterized in p1237. This time must always be greater than the actual contactor opening time, as otherwise the
Motor Module would be short-circuited!
Re cause 201:
- a Motor Module with a higher maximum current or a motor with a lower short-circuit current must be used. The max-
imum Motor Module current must be higher than 1.8 * short-circuit current of the motor.
Re cause 202:
- for internal voltage protection, use a Motor Module in booksize or chassis format.
Re cause 203:
- for internal voltage protection, only use short-circuit proof motors.
Re cause 204:
- The internal voltage protection must either be activated for all motor data sets with synchronous motors (p0300 =
2xx, 4xx) (p1231 = 3) or it must be de-activated for all motor data sets (p1231 not equal to 3). This therefore ensures
that the protection cannot be accidentally withdrawn as a result of a data set changeover. The fault can only be
acknowledged if this condition is fulfilled.
207907 <location>Internal armature short-circuit: Motor terminals are not at zero potential after
pulse suppression
Message value: -
Drive object: SERVO_COMBI, SERVO_SINUMERIK828
Reaction: NONE
Acknowledge: IMMEDIATELY
Cause: The function "Internal voltage protection" (p1231 = 3) was activated. The following must be observed:
- when the internal voltage protection is active, after pulse suppression, all of the motor terminals are at half of the DC
link voltage (without an internal voltage protection, the motor terminals are at zero potential)!
- it is only permissible to use motors that are short-circuit proof (p0320 < p0323).
- the Motor Module must be able to continually conduct 180% short-circuit current (r0331) of the motor (r0289).
- the internal voltage protection cannot be interrupted due to a fault response. If an overcurrent condition occurs during
the active, internal voltage protection, then this can destroy the Motor Module and/or the motor.
- if the Motor Module does not support the autonomous, internal voltage protection (r0192.10 = 0), in order to ensure
safe, reliable functioning when the line supply fails, an external 24 V power supply (UPS) must be used for the com-
ponents.
- if the Motor Module does support the autonomous, internal voltage protection (r0192.10 = 1), in order to ensure safe,
reliable functioning when the line supply fails, the 24 V power supply for the components must be provided through a
Control Supply Module.
- if the internal voltage protection is active, it is not permissible that the motor is driven by the load for a longer period
of time (e.g. as a result of loads that move the motor or another coupled motor).
Remedy: None necessary.
This a note for the user.
Alarms
Diagnostics Manual, 07/2010, 6FC5398-8BP40-0BA0
SINAMICS alarms
673