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

12.5 Troubleshooting Based on the Operation and Conditions of the Servomotor

12.5

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
12-58
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).
There is a mistake in the
input signal allocations
(Pn50A, Pn50B, Pn511, and
Pn516).
The SV_ON command was
not sent.
The SENS_ON (Turn ON
Sensor) command was not
sent.
The P-OT (Forward Drive
Prohibit) or N-OT (Reverse
Drive Prohibit) signal is still
OFF.
The safety input signals
(/HWBB1 or /HWBB2) were
not turned ON.
The FSTP (Forced Stop
Input) signal is still OFF.
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 input signal
allocations (Pn50A,
Pn50B, Pn511, and
Pn516).
Check the commands
sent from the host con-
troller.
Check the commands
sent from the host con-
troller.
Check the P-OT and N-
OT signals.
Check the /HWBB1 and
/HWBB2 input signals.
Check the FSTP signal.
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 4-34,
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 6-32
the encoder that is
being used.
Correctly allocate the
input signals (Pn50A,
page 6-4,
page 9-5
Pn50B, Pn511, and
Pn516).
Send the SV_ON com-
mand from the host
–
controller.
Send the commands to
the SERVOPACK in the
–
correct sequence.
Turn ON the P-OT and
page 9-5
N-OT signals.
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.
• Turn ON the FSTP
signal.
• If you will not use the
function to force the
motor to stop, set
page 9-5
Pn516 = n.X
(FSTP (Forced Stop
Input) Signal Alloca-
tion) to disable the
signal.
Continued on next page.