Troubleshooting With No Alarm Display - YASKAWA MECHATROLINK Sigma 2 Series User Manual

9.2

Troubleshooting with No Alarm Display

Refer to the tables below to identify the cause of a problem which causes no alarm display and
take the remedy described.
Turn OFF the servo system power supply before commencing the shaded procedures.
Contact your Yaskawa representative if the problem cannot be solved by the described proce-
dures.
Symptom
Servomotor Does Not Start
Servomotor Does Not Run
Servomotor Moves Instanta-
neously, then Stops
Servomotor Speed Unstable
Servomotor Vibrates at Ap-
proximately 200 to 400 Hz.
High Rotation Speed Over-
shoot on Starting and Stop-
ping.
Table 9.1 Troubleshooting Table with No Alarm Display
Cause
Power is not turned ON.
Loose connection.
Connector (CN1) external wir-
ing is incorrect.
Servomotor or encoder wiring
disconnected.
Overloaded.
Encoder type differs from
parameter setting.
P-OT and N-OT inputs are
turned OFF.
Software limits P-SOT and N-
SOT are 1.
Motion commands have not
been sent.
SV_ON command has not
been sent.
SENS_ON command has not
been sent.
Servomotor or encoder wiring
incorrect.
Wiring connection to motor is
defective.
Speed loop gain value is too
high.
Speed loop gain value is too
high.
Speed loop gain is too low
compared to position loop
gain.
9-21
9.2 Troubleshooting with No Alarm Display
Inspection
Check voltage between power
supply terminals.
Check terminals of connectors
(CN1, CN2).
Check connector (CN1) exter-
nal wiring
−
Run under no load.
Check the type of encoder
being used.
Refer to section 6.2.2.
Refer to section 6.2.3.
Check using
MECHAROLINK-II
communications or the
MECHATROLINK-II monitor.
−
Check connection of power
lead (phases U, V, and W) and
encoder connectors.
−
−
−
Remedy
Correct the power circuit.
Tighten any loose parts.
Refer to connection diagram
and correct wiring.
Reconnect wiring.
Reduce load or replace with
larger capacity servomotor.
Set parameter Pn002.2 to the
encoder type being used.
Turn P-OT and N-OT input
signals ON.
Operate the servomotor within
the software limits.
Send the motion commands.
Send the SV_ON command.
Send the SENS_ON command.
Refer to chapter Chapter 3
and correct wiring.
Tighten any loose terminals or
connectors.
Reduce speed loop gain
(Pn100) preset value.
Reduce speed loop gain
(Pn100) preset value.
Increase integration time con-
stant (Pn101).
Increase speed loop gain
(Pn100).
Reduce the integration time
constant (Pn101).
9