Siemens SINAMICS V90 Operating Instructions Manual page 321

Fault
F7800 Drive: No power unit
present
Message class: Error in the
parameteriza-
tion/configuration/commissionin
g procedure (18)
Reaction: NONE
Acknowledgement:
IMMEDIATELY
F7801: Motor overcurrent
Message class: Motor overload
(8)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7802: Infeed or power unit not
ready
Message class: Infeed faulted
(13)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7815: Power unit has been
changed
Message class: Error in the
parameteriza-
tion/configuration/commissionin
g procedure (18)
Reaction: NONE
Acknowledgement:
IMMEDIATELY
F7900: Motor blocked/speed
controller at its limit
Message class: Applica-
tion/technological function faulty
(17)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2020, A5E37208830-008
Cause
The power unit parameters cannot be
read or no parameters are stored in the
power unit.
The permissible motor limit current was
exceeded.
Effective current limit set too low.
•
Current controller not correctly set.
•
Motor was braked with an excessive-
•
ly high static torque correction factor.
Up ramp was set too short or the
•
load is too high.
Short-circuit in the motor cable or
•
ground fault.
Motor current does not match the
•
current of Motor Module.
After an internal power-on command,
the infeed or drive does not signal ready
because of one of the following reasons:
Monitoring time is too short.
•
DC link voltage is not present.
•
Associated infeed or drive of the
•
signaling 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.
12.2 List of faults and alarms
Remedy
Carry out a POWER ON (power off/on) for
•
all components.
Change the module.
•
Reduce the static torque correction factor.
•
Increase the up ramp or reduce the load.
•
Check the motor and motor cables for
•
short-circuit and ground fault.
Check the Motor Module and motor com-
•
bination.
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.
•
Diagnostics
319