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.
Problem
Servomotor
Does Not
Start
14-56
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.
Confirmation
Measure the voltage
between control power
supply terminals.
Measure the voltage
across the main circuit
power input terminals.
Turn OFF the power sup-
ply to the servo system.
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.
−
Correction Reference
Turn OFF the power
supply to the servo
system.
−
Correct the wiring so
that the control power
supply is turned ON.
Turn OFF the power
supply to the servo
system.
−
Correct the wiring so
that the main circuit
power supply is turned
ON.
Correct the wiring of
page 4-33,
the I/O signal connec-
page 9-6
tor (CN1) pins.
Turn OFF the power
supply to the servo
−
system.
Wire the cable cor-
rectly.
Turn OFF the power
supply to the servo
system.
−
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 9-6
or CW-OT signal.
Turn ON the /HWBB1
and /HWBB2 input sig-
nals. If you are not
using the safety func-
page 9-6
tion, connect the Safety
Jumper Connector
(provided as an acces-
sory) to CN8.
Turn OFF the power
supply to the servo
−
system.
Replace the SERVO-
PACK.
Continued on next page.