M-Series Operator’s Manual 4/9/15 15-6
Number
Message Cause & Effect Action
435 _ axis runaway:
Check motor
wiring
Motor was in a runaway fault condition.
Power to motor will automatically be
shut off.
Check motor wiring
436 Servo drive
shutdown
This error message is produced by
hardware detection of a physical error.
The servo drive hardware generates this
error message if it detects either an
overcurrent or overvoltage condition.
The particular hardware condition is
reflected on the servo drive LED’s.
Once the servo drive detects this error
condition it stops all motion and
removes power to the motors. The
hardware indicates the presence of this
condition to the CNC software via the
servo drive fault input to the PLC.
On DC systems check status of the
servo drive LED’s and check fibers
4&5. If this message is displayed on an
AC system check P178 bit 4 is set.
437 Servo power
removed
Axis was moving more than 300 RPM
while power was supposed to be off.
1.) Motor may be wired backwards.
2.) May be a shorted servo drive.
3.) Axis motion is canceled but motor
continues to move due to inertia, which
is probably caused by an unbalanced
axis.
Power to motors is released.
Check motor wiring, servo drive, or
look at Kg value in PID and make sure
it’s not above +/- 5.
438 Spindle slave
position error
The slaved axis moved too far in the
wrong direction during a spindle-slaved
move (such as in rigid tapping). Job is
cancelled.
Check parameter 34 for wrong sign in
front of encoder counts.
439 _ axis servo
drive data output
error
Logic power failure or loss of
communication from the drive to the
MPU11.
Is logic LED on? Check fiber optic
cables to drive. For SD1 drives, make
sure bus cables are shielded and are as
short as possible. Power unit down
and check drive connections.
441 _ axis
overvoltage
Input power has gone higher than
340VDC and will shutdown the drive
and removes power. The motor brake
will engage for 5 seconds in this
condition.
Check input voltage is below 340VDC.
If not, incoming VAC needs lowered.
442 _ axis
undervoltage
Drive input power is less than 80 VDC. Check supply voltage.
443 _ axis
commutation
encoder bad
Control detected invalid commutation
zone value.
Perform a motor Move Sync in the
Drive menu. A Zero (0) or Seven (7)
is an invalid zone. Check for:
a.) Wiring problem in the encoder
cable or motor end cap (broken
encoder wires).
b.) Encoder cable shield connected at
motor end, when it shouldn’t be.
c.) Bad encoder.
d.) Motor power cable shields not
connected.
e.) Drive not grounded properly.
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