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Sigma II User's Manual
9.2.2Troubleshooting Problems with No Alarm Display
Use the tables below to identify the cause of a problem that causes no alarm display
and follow the described corrective procedure.
Turn OFF the servo system power supply before starting the shaded procedures.
Contact Yaskawa if the problem cannot be solved by carefully following the
described procedure.
Symptom
Power not connected
Loose connection
Connector (CN1) external
wiring incorrect
Servomotor or encoder wir-
ing disconnected.
Overloaded
No speed/position refer-
ences input
Servomotor does
/S–ON is turned OFF
not start
/P–CON input function set-
ting incorrect
Reference pulse mode
selection incorrect.
Encoder type differs from
parameter setting.
P-OT and N-OT inputs are
turned OFF.
CLR input is turned ON
SEN input is turned OFF.
Servomotor
Servomotor or encoder wir-
moves suddenly,
ing incorrect.
then stops
Suddenly stops
Alarm reset signal (/ALM-
during operation
RST) is turned ON because
and will not
an alarm occurred
restart
Unstable servo-
Defective wiring connection
motor speed.
to the motor.
Troubleshooting Table No Alarm Display
Cause
Check voltage between power
supply terminals.
Check terminals of connec-
tors (CN1, CN2).
Check connector (CN1) exter-
nal wiring
–––
Run under no load.
Check reference input pins.
Check settings of parameters
Pn50A.0 and Pn50A.1.
Check parameter Pn000.1.
Refer to section 5.2.2
Incremental or absolute
encoder?
Refer to section 5.1.2.
Check status of error counter
clear input.
When absolute encoder is
used.
–––
–––
Check the connections of the
power lead (U-, V-, and W-
phases) and the encoder con-
nectors.
9-35
Chapter 9: Inspection, Maintenance, and Troubleshooting
Comment
Solution
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 section 5.3.5 and set
parameters to match applica-
tion.
Correct setting of parameter
Pn200.0.
Set parameter Pn002.2 to the
encoder type being used.
Turn P-OT and N-OT input
signals ON.
Turn CLR input OFF.
Turn SEN input ON.
Refer to chapter 3 and cor-
rect wiring.
Remove cause of alarm. Turn
alarm reset signal (ALM-
RST) from ON to OFF.
Tighten any loose terminals
or connectors
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