Troubleshooting Based On The Operation And Conditions Of The Servomotor - YASKAWA SGD7S Product Manual

14.4 Troubleshooting Based on the Operation and Conditions of the Servomotor

14.4

Troubleshooting Based on the Operation and Conditions of the Servomotor

This section provides troubleshooting based on the operation and conditions of the Servomo-
tor, including causes and corrections.
Turn OFF the Servo System before troubleshooting the items shown in bold lines in the table.
Problem
Servomotor
Does Not
Start
14-54
Possible Cause
The control power supply is
not turned ON.
The main circuit power sup-
ply is not turned ON.
The I/O signal connector
(CN1) pins are not wired cor-
rectly or are disconnected.
The wiring for the Servomo-
tor Main Circuit Cables or
Encoder Cable is discon-
nected.
There is an overload on the
Servomotor.
The type of encoder that is
being used does not agree
with the setting of Pn002 =
n.X (Encoder Usage).
The Servo ON command has
not been input.
The CCW-OT (CCW Drive
Prohibit) or CW-OT (CW
Drive Prohibit) signal is still
OFF.
The safety input signals
(/HWBB1 or /HWBB2) were
not turned ON.
A failure occurred in the SER-
VOPACK.
The polarity detection was
not executed.
Confirmation
Measure the voltage
between control power
supply terminals.
Measure the voltage
across the main circuit
power input terminals.
Check the wiring condi-
tion of the I/O signal con-
nector (CN1) pins.
Check the wiring condi-
tions.
Operate the Servomotor
with no load and check
the load status.
Check the type of the
encoder that is being
used and the setting of
Pn002 = n.X.
Check the commands
sent from the host con-
troller.
Check the CCW-OT and
CW-OT signals.
Check the /HWBB1 and
/HWBB2 input signals.
−
Check the setting of
Pn080 =n.X (Polar-
ity Sensor Selection).
Check the Servo ON
command input.
Correction Reference
Correct the wiring so
−
that the control power
supply is turned ON.
Correct the wiring so
that the main circuit
−
power supply is turned
ON.
Correct the wiring of
page 4-32,
the I/O signal connec-
page 9-5
tor (CN1) pins.
Wire the cable cor-
−
rectly.
Reduce the load or
replace the Servomo-
−
tor with a Servomotor
with a larger capacity.
Set Pn002 = n.X
according to the type of
page 6-18
the encoder that is
being used.
Input the Servo ON
−
command from the
host controller.
Turn ON the CCW-OT
page 9-5
or CW-OT signal.
Turn ON the /HWBB1
and /HWBB2 input sig-
nals. If you are not
using the safety func-
page 9-5
tion, connect the Safety
Jumper Connector
(provided as an acces-
sory) to CN8.
Replace the SERVO-
−
PACK.
Correct the parameter
page 5-25
setting.
• If you are using an
incremental linear
encoder, send the
Servo ON command
from the host control-
page 5-26
ler.
• If you are using an
absolute linear
encoder, execute
polarity detection.
Continued on next page.