YASKAWA SGM Series User Manual page 273

J Troubleshooting: No Alarm and Warning Displayed but Motor Does
Symptom
Servomotor does not run Main power supply not turn ON
Loose connection
1CN connector external wiring
incorrect
Encoder to Servomotor wiring
disconnected
Overloaded
Move reference not transferred
SV_ON command not transferred
SENS_ON command not transferred
Encoder type differs from the user
constant setting
P-OT and N-OT inputs are turned OFF
Servomotor moves instan- Number of encoder pulses differs from
taneously, then stops y p the user constant setting
Servomotor or encoder wiring incorrect −
Servomotor speed unsta- Wiring connection to the Servomotor
ble defective
Servomotor vibrates Speed loop gain value too high
around 200 to 400 Hz
High rotation speed over- Speed loop gain value too high
shoot on starting and stop-
ping
Servomotor overheated Ambient temperature too high
Servomotor surface dirty
Overloaded
Not Run
Table 12.9 Troubleshooting with no Alarm Displays
Cause Conditions
Check voltage across Correct the power supply circuit.
the power supply ter-
minals.
Check 1CN and 2CN Tighten any loose parts.
connectors and
terminals.
Check 1CN connector Refer to the connection diagram and
external wiring. correct the wiring.
− Reconnect the wiring.
Run under no−load Reduce the load or replace with a larger
conditions. capacity Servomotor.
Check by MECHA- Transfer the moving reference.
TROLINK commu- TROLINK commu-
Transfer the SV_ON command.
nications or MECHA-
TROLINK monitor TROLINK monitor-
Transfer the SENS_ON command.
ing.
Check whether the en- Set user constant Cn−0001 bit 14 ac-
coder is an incremental cording to the encoder type.
or absolute encoder.
If Cn−0001 bits 2 and Turn ON the P-OT and N-OT inputs.
3 are 0
− Set user constant Cn−0011 according to
to the number of encoder pulses.
Correct the wiring.
Check power lead (U-, Tighten any loose terminals or connec-
V- and W-phases) and tors.
encoder connector
connections.
− Reduce the speed loop gain user
constant Cn−0004.
− Reduce the speed loop gain user
constant Cn−0004.
Measure the Servomo- Reduce Servomotor ambient tempera-
tor ambient tempera- ture to under 40°C.
ture.
Check visually. Clean off dust and oil from the Servo-
motor surface.
Run under no−load Reduce the load or replace with a larger
conditions. capacity Servomotor.
12 -11
12.2 Troubleshooting
Remedy
12