Yaskawa FSP Amplifier - Manual (Page 302)

FSP Amplifier User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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9.2.2. Troubleshooting 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 YEA if the problem cannot be solved by carefully following the
described procedure.
Symptom Cause Comment Solution
Power not connected
Check voltage between
power supply terminals.
Correct the power circuit.
Loose connection
Check terminals of
connectors (CN1, CN2).
Tighten any loose parts.
Connector (CN1)
external wiring
incorrect
Check connector (CN1)
external wiring Refer to connection diagram
and correct wiring.
Servomotor or encoder
wiring disconnected.
— Reconnect wiring
Overloaded Run under no load.
Reduce load or replace with
larger capacity servomotor.
No speed/position
references input Check reference input
pins. Correctly input speed/position
references.
/S-ON is turned OFF
Check settings of
parameters Pn50A.0 and
Pn50A.1.
Turn /S-ON input ON.
/P-CON input function
setting incorrect Check parameter
Pn000.1.
Refer to section 5.3.5 and set
parameters to match
application.
Reference pulse mode
selection incorrect.
Refer to section 5.2.2
Correct setting of parameter
Pn200.0.
Encoder type differs
from parameter
setting. Confirm whether
incremental or absolute
encoder is used.
Set parameter Pn002.2 to the
encoder type being used.
P-OT and N-OT inputs
are turned OFF.
Refer to section 5.1.2.
Turn P-OT and N-OT input
signals ON.
CLR input is turned
ON Check status of error
counter clear input.
Turn CLR input OFF.
Servomotor does
not start
SEN input is turned
OFF. When absolute encoder
is used.
Turn SEN input ON.
Servomotor moves
suddenly, then
stops
Servomotor or encoder
wiring incorrect.
—
Refer to chapter 3 and correct
wiring.
Suddenly stops
during operation
and will not restart
Alarm reset signal
(/ALM-RST) is turned
ON because an alarm
occurred
—
Remove cause of alarm. Turn
alarm reset signal (ALM-RST)
from ON to OFF.
Unstable servo-
motor speed.
Defective wiring
connection to the
motor.
Check the connections
of the power lead (U-, V-,
and W-phases) and the
encoder connectors.
Tighten any loose terminals or
connectors