11.6.21 Error 20: Hardware limit switch error
11.6.21.1 Error 20-1 (emergency code 8612h)
Cause: Hardware limit switches interchanged
Suggested steps:
Check your hardware
Position was limited
internally.
l
Please check factor group setting and position
command
l
Take a scope record to determine if the
position control overshoots.
There is a problem with the
digital/analog inputs
l
Please check the 24V I/O wiring, function
assignment and inversion parameters.
l
Please check connected switches for
chattering. Consider using the input filter.
The speed control might run
away, most likely due to a
wrong encoder offset.
l
Please check that the encoder offset is set
properly.
l
If auto commutation is used, re-view the auto
commutation setting and test under all
possible conditions.
l
If torque mode is used, reduce torque, ensure
external speed limitation, or increase speed
control gain for stronger limitation.
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
372
11 Alarms & warnings
11.6.21.2 Error 20-2 (emergency code 8612h)
Cause: Positive hardware limit switch (LSW_P) detected
Suggested steps:
Check your hardware
Position was limited
internally.
l
Please check factor group setting and position
command
l
Take a scope record to determine if the
position control overshoots.
There is a problem with the
digital/analog inputs
l
Please check the 24V I/O wiring, function
assignment and inversion parameters.
l
Please check connected switches for
chattering. Consider using the input filter.
The speed control might run
away, most likely due to a
wrong encoder offset.
l
Please check that the encoder offset is set
properly.
l
If auto commutation is used, re-view the auto
commutation setting and test under all
possible conditions.
l
If torque mode is used, reduce torque, ensure
external speed limitation, or increase speed
control gain for stronger limitation.