YASKAWA Sigma Mini SGMM Series User Manual page 234

5.2.2 Troubleshooting Problems With No Alarm Display
Refer to the following table to identify the cause of a problem that causes no alarm display and
take the remedy described.
Turn OFF the servo system power supply before commencing the procedures indicated with
shading.
Contact your Yaskawa representative if the problem cannot be solved by the described pro-
cedures.
Symptom
Servomotor does not start
Power not connected
Loose connection
Connector (CN1) external
wiring incorrect
Servomotor or encoder
wiring disconnected.
Overloaded
Speed/position references
not input
/S-ON is turned OFF
/P-CON input function
setting incorrect
Reference pulse mode
selection incorrect.
/CLR input is turned ON
Servomotor moves Servomotor or encoder
instantaneously, then stops wiring incorrect.
Suddenly stops during Alarm reset signal
operation and will not restart (/ALMRST) is turned ON
because an alarm occurred.
Servomotor speed unstable Wiring connection to
Servomotor defective
Servomotor vibrates at Speed loop gain value too
app o approximately 200 to ate y 00 to high.
400 Hz.
Speed/position reference
input lead too long.
Speed/position reference
input lead is bundled with
power cables.
High rotation speed Speed loop gain value too
overshoot on starting and high.
stopping.
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Cause Inspection
Check voltage across
24 VDC and GND.
Check terminals of
connectors (CN1, CN2).
Check connector (CN1)
external wiring
Run under no load.
Check input pins.
Cn-01 bit 0 is 0.
Check parameters Cn-01
bits A, B.
Refer to 2.2.2 Position
References.
Check status of error
counter clear input.
Check connection of power
lead (phases U, V, and W)
and encoder connectors.
— 5-13 —
5.2 Error Diagnosis and Troubleshooting
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.
Correctly input
speed/position references.
Turn /S-ON input ON.
Refer to 2.2.1 Speed
References and set
parameters to match
application.
Select correct parameters
Cn-02 bits 3, 4, 5.
Turn /CLR input OFF.
Refer to 2.8 Special Wiring
and correct wiring.
Remove cause of alarm.
Turn alarm reset signal
(/ALMRST) from ON to OFF.
Tighten any loose terminals
or connectors.
Reduce speed loop gain
(Cn-04) preset value.
Minimize length of
speed/position reference
input lead, with impedance
not exceeding several
hundred ohms
Separate reference input
lead at least 30 cm from
power cables.
Reduce speed loop gain
(Cn-04) preset value.
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