YASKAWA SGM Series User Manual page 201

Maintenance and Inspection
12.2.2 SERVOPACK
Symptom
Poor servo tracking performance
12
Symptom
Servomotor does not
run
Servomotor moves
instantaneously, then
stops
J Problems due to Setting Errors
Table 12.8 Problems due to Setting Errors
Cause
Position loop gain too low
J Troubleshooting: No Alarm or Warning Displayed but Motor
Does Not Run
Table 12.9 Troubleshooting with no Alarm or Warning Displays
Cause
SENS_ON command not transfer
Encoder to Servomotor wiring discon-
nected
P-OT and N-OT inputs are turned OFF
Number of encoder pulses differs from
the user constant setting (Cn-0011).
Servomotor or encoder wiring incorrect −
Increase the position loop gain (Cn-001A). Decrease the
speed loop gain (Cn-0004) when increasing position
loop gain causes hunting.
Note Do not increase the position loop gain any
higher once hunting occurs. This is the tracking
performance limit.
Conditions
Bits 0 and 1 of Transfer the SENS_ON command.
Cn-0001 set to 0
− Reconnect the wiring.
Bits 2 and 3 of Turn ON the P-OT and N-OT inputs.
Cn-0001 set to 0
− Set the user constant (Cn-0011) to
match the number of encoder pulses if
necessary.
Correct the wiring.
12 -8
Remedy
Remedy