Troubleshooting Based On The Operation And Conditions Of The Servomotor - YASKAWA E-7S SERVOPACK SGD7S Product Manual

15.4

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
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.
Servomotor
There is an overload on the
Does Not
Servomotor.
Start
The type of encoder that is
being used does not agree
with the setting of Pn002 =
n.X (Encoder Usage).
Settings for input signals
PnB03 to PnB12 are incor-
rect.
The /S-ON (Servo ON) signal
was not received.
The P-OT (Forward Drive
Prohibit) or N-OT (Reverse
Drive Prohibit) signal is still
OFF.
The current position of the
servomotor is outside the
software limit setting range.
There is no position refer-
ence, or it is incorrect.
15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Possible Cause
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 settings of input
signals PnB03 to PnB12.
Check the commands
sent from the host con-
troller.
Check the P-OT and N-
OT signals.
Check the error at the
INDEXER Module.
Check the error at the
INDEXER Module.
Confirmation Correction
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
the I/O signal connec-
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
the encoder that is
being used.
Correct the settings of
input signals PnB03 to
PnB12.
Turn ON the /S-ON sig-
nal from the host con-
troller.
Turn ON the P-OT and
N-OT signals.
Check the motor posi-
tion and software limit
setting (PnB21,
PnB23), then move the
servomotor into the
software limit setting
range.
Set the program table
correctly.
Reference
–
–
page 4-34,
page 9-6
–
–
page 6-23
page 6-3,
page 9-6
page 9-6
page 9-6
–
–
Continued on next page.
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