Fault
(“F”)
Warning
(“n”)
Message/Warning Cause Remedy Drive
Respons-
e to Fault
F257 Analog Input under
voltage
The analog input value
is below the
AIN.UVFTHRESH
level.
Check the analog input sig-
nal or change the
AIN.UVFTHRESH value.
Controlled
stop
n256 Warning: Analog Input
over voltage
The analog input value
is above the
AIN.OVWTHRESH
level.
Check the analog input sig-
nal or change the
AIN.OVWTHRESH value.
None
n257 Warning: Analog Input
under voltage
The analog input value
is below the
AIN.UVWTHRESH
level.
Check the analog input sig-
nal or change the
AIN.UVWTHRESH value.
None
F301
n301
Motor overheated. Motor overheated. Check ambient tem-
perature. Check motor
mounting heat sink cap-
ability
Disable
power
stage
F302 Over speed. Motor exceeded
VL.THRESH value.
Increase VL.THRESH or
lower velocity command.
Dynamic
braking
F303 Run away. Motor did not follow
command values.
Current command to the
motor is too high for too
long. Reduce servo gains,
or reduce command tra-
jectory aggressiveness.
Controlled
stop
F304
n304
Motor Foldback. Maximum motor power
has been exceeded; the
power has been limited
to protect the motor
Motion is requiring too
much power. Change move
profile to reduce load on
motor. Check for load jam-
ming or sticking. Check
that current limits are set
correctly.
Controlled
stop
F305 Brake open circuit. Motor brake open cir-
cuit. Fault threshold is
200 mA.
Check cabling and general
functionality. For special
low current brake applic-
ations, the F305 fault can
be bypassed using the set-
ting motor.brake = 100.
Dynamic
braking
F306 Brake short circuit. Motor brake short cir-
cuit.
Check cabling and general
functionality. Check that
MOTOR.TBRAKERLS
and
MOTOR.TBRAKEAPP
are configured.
Dynamic
braking
F307 Brake applied during
Enable-State.
Motor brake closed
unexpectedly.
Check cabling and general
functionality.
Dynamic
braking
AKD Fault Card | 2 Fault and Warning Messages
Kollmorgen | kdn.kollmorgen.com | November 2019 14
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