YASKAWA SGD7S series, Product Manual

Page: 531 / 629

12.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
12-55
12
Maintenance
12.4 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 Possible Cause Confirmation Correction Reference
Servomotor
Does Not
Start
The control power supply is
not turned ON.
Measure the voltage
between control power
supply terminals. Correct the wiring so
that the control power
supply is turned ON.
–
The main circuit power sup-
ply is not turned ON.
Measure the voltage
between the main circuit
power input terminals.
Correct the wiring so
that the main circuit
power supply is turned
ON.
–
The I/O signal connector
(CN1) pins are not wired cor-
rectly or are disconnected. Check the wiring condi-
tion of the I/O signal con-
nector (CN1) pins. Correct the wiring of
the I/O signal connec-
tor (CN1) pins.
page 4-33,
page 9-7
The wiring for the Servomo-
tor Main Circuit Cables or
Encoder Cable is discon-
nected.
Check the wiring condi-
tions. Wire the cable cor-
rectly.
–
There is an overload on the
Servomotor.
Operate the Servomotor
with no load and check
the load status.
Reduce the load or
replace the Servomo-
tor with a Servomotor
with a larger capacity.
–
The type of encoder that is
being used does not agree
with the setting of Pn002 =
n.

X

(Encoder Usage).
Check the type of the
encoder that is being
used and the setting of
Pn002 = n.

X

.
Set Pn002 = n.

X

according to the type of
the encoder that is
being used.
page 6-73
No speed or position refer-
ence is input. Check the allocation sta-
tus of the input signals.
Allocate an input signal
so that the speed and
position references are
input correctly.
page 4-33,
page 9-7
There is a mistake in the
input signal allocations
(Pn50A to Pn50D, Pn515,
and Pn516). Check the input signal
allocations (Pn50A to
Pn50D, Pn515, and
Pn516). Correctly allocate the
input signals (Pn50A to
Pn50D, Pn515, and
Pn516).
page 6-5,
page 9-7
The /S-ON (Servo ON) signal
is OFF.
Check the settings of
Pn50A = n.

X (Input
Signal Allocation Mode)
and Pn50A =n.

X

(/S-ON (Servo ON) Signal
Allocation).
Set Pn50A = n.

XX
correctly and turn ON
the /S-ON signal.
page 5-17,
page 9-7
The function setting of the /
P-CON (Proportional Con-
trol) signal is not correct. Check the setting of
Pn000 = n.

X

(Con-
trol Method Selection).
Set the parameter to
match the application.
page 5-13
The SEN input is OFF.
Check the ON/OFF status
of the SEN input.
If you are using an
absolute encoder, turn
ON the SEN signal.
page 6-73,
page 9-7
The reference pulse mode
selection is not correct.
Check the setting of
Pn200 =n.

X (Refer-
ence Pulse Form) and the
reference pulse form.
Set Pn200 =n.

X
so that is agrees with
the reference pulse
form.
page 6-31
Speed control: The speed
reference input is not appro-
priate.
Check between the
speed reference input (V-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Correctly set the con-
trol method and input
method.
page 9-7
Continued on next page.