Siemens SINAMICS V90 Operating Instructions Manual page 303

Fault
F7802: Infeed or power unit
not ready
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
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
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 07/2015, 6SL3298-0AV60-0BP0
Cause
After an internal power-on command, the
infeed or drive does not signal ready be-
cause of one of the following reasons:
Monitoring time is too short.
•
DC link voltage is not present.
•
Associated infeed or drive of the signal-
•
ing component is defective.
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 1s and below the
speed threshold of 120 rpm .
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.
For incremental motor, needs pole position
identification when first SON. If 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.
•
11.2 List of faults and alarms
Remedy
Ensure that there is a DC link voltage.
•
Check the DC link busbar. Enable the in-
feed.
Replace the associated infeed or drive of
•
the signaling component.
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 if there are any peaks of actual speed.
If the value of the peak is especially large,
contact the hotline.
Stop motor before SON.
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.
Diagnostics
303