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

4.1 SERVOPACKs with Analog Voltage/Pulse Train References

4.1.7 Troubleshooting Based on the Operation and Conditions of the Servomotor

4.1.7 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
4-44
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).
No speed or position refer-
ence is input.
There is a mistake in the
input signal allocations
(Pn50A to Pn50D, Pn515,
and Pn516).
The /S-ON (Servo ON) signal
is OFF.
The function setting of the /
P-CON (Proportional Con-
trol) signal is not correct.
The SEN input is OFF.
The reference pulse mode
selection is not correct.
Speed control: The speed
reference input is not appro-
priate.
Confirmation
Measure the voltage
between control power
supply terminals.
Measure the voltage
between 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 allocation sta-
tus of the input signals.
Check the input signal
allocations (Pn50A to
Pn50D, Pn515, and
Pn516).
Check the settings of
Pn50A = n.X (Input
Signal Allocation Mode)
and Pn50A =n.X
(/S-ON (Servo ON) Signal
Allocation).
Check the setting of
Pn000 = n.X (Con-
trol Method Selection).
Check the ON/OFF status
of the SEN input.
Check the setting of
Pn200 =n.X (Refer-
ence Pulse Form) and the
reference pulse form.
Check between the
speed reference input (V-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
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
*
the I/O signal connec-
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
*
the encoder that is
being used.
Allocate an input signal
so that the speed and
*
position references are
input correctly.
Correctly allocate the
input signals (Pn50A to
*
Pn50D, Pn515, and
Pn516).
Set Pn50A = n.XX
*
correctly and turn ON
the /S-ON signal.
Set the parameter to
*
match the application.
If you are using an
*
absolute encoder, turn
ON the SEN signal.
Set Pn200 =n.X
so that is agrees with
*
the reference pulse
form.
Correctly set the con-
*
trol method and input
method.
Continued on next page.