Siemens SINAMICS V90 Operating Instructions Manual page 338

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Diagnostics
11.2 List of faults and alarms
Fault
F7815: Power unit has been
changed
Reaction: NONE
Acknowledgement:
IMMEDIATELY
F7900: Motor blocked/speed
controller at its limit
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7901: Motor overspeed
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7995: Motor identification
failure
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F30001: Power unit: Overcur-
rent
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
338
Cause
The code number of the actual power unit
does not match the saved number.
The servo motor has been operating at the
torque limit longer than the delay time
(p2177) and below the speed threshold
(p2175).
This signal can also be initiated if the
speed actual value is oscillating and the
speed controller output repeatedly goes to
its limit.
The maximumly permissible speed has
been exceeded.
The speed limit has been exceeded.
For incremental motor, needs pole position
identification when first SON. If the motor
already in run (i.e. by external force) posi-
tion identification may failure.
The power unit has detected an overcur-
rent condition.
Closed-loop control is incorrectly pa-
rameterized.
Controller parameters are not proper.
Motor has a short-circuit or fault to
ground (frame).
Power cables are not correctly con-
nected.
Power cables exceed the maximum
permissible length.
Power unit defective.
Line phase interrupted.
Remedy
Connect the original power unit and power up
the Control Unit again (POWER ON).
Check whether the servo motor can rotate
freely or not.
Check the torque limit.
Check the inversion of the actual value.
Check the motor encoder connection.
Check the encoder pulse number.
Check and correct the maximum speed
(p1082).
Check and correct the speed limit
(p29070, p29071), and the DI signals
SLIM1 and SLIM2.
Check if there are any peaks of actual
speed. If the value of the peak is especial-
ly large, contact the hotline.
Stop the motor before servo on.
Check the motor data - if required, carry
out commissioning.
Modify speed loop Kp (p29120), position
loop Kv (p29110).
Check the motor circuit configuration
(star-delta).
Check the power cable connections.
Check the power cables for short-circuit or
ground fault.
Check the length of the power cables.
Replace power unit.
Check the line supply phases.
Check the external braking resistor con-
nection.
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002

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