15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
15-52
Servomotor
Does Not
Start
The safety input signals
(/HWBB1 or /HWBB2) were
not turned ON.
Check the /HWBB1 and
/HWBB2 input signals.
Turn ON the /HWBB1
and /HWBB2 input sig-
nals. If you are not
using the safety func-
tion, connect the Safety
Jumper Connector
(provided as an acces-
sory) to CN8.
The FSTP (Forced Stop
Input) signal is still OFF.
Check the FSTP signal.
•
Turn ON the FSTP
signal.
•
If you will not use the
function to force the
motor to stop, set
Pn516 (2516 hex) =
n.
X (FSTP
(Forced Stop Input)
Signal Allocation) to
disable the signal.
A failure occurred in the SER-
VOPACK.
–
Turn OFF the Servo
System. Replace the
SERVOPACK.
−
The polarity detection was
not executed.
Check the setting of
Pn080 (2080 hex)
=n.
X (Polarity Sen-
sor Selection).
Correct the parameter
setting.
Check the inputs to the
Servo ON command
(Enable Operation com-
mand).
•
If you are using an
incremental linear
encoder, send the
Servo ON command
(Enable Operation
command) from the
host controller.
•
If you are using an
absolute linear
encoder, execute
polarity detection.
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in the Ser-
vomotor wiring.
Turn OFF the Servo Sys-
tem. Check the wiring.
Wire the Servomotor
correctly.
−
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
Turn OFF the Servo Sys-
tem. Check the wiring.
Wire the Serial Con-
verter Unit correctly.
−
There is a mistake in the lin-
ear encoder wiring.
Turn OFF the Servo Sys-
tem. Check the wiring.
Wire the cable cor-
rectly.
−
The setting of Pn282 (2282
hex) (Linear Encoder Pitch) is
not correct.
Check the setting of
Pn282 (2282 hex).
Correct the setting of
Pn282 (2282 hex).
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Check the directions.
Change the setting of
Pn080 (2080 hex) =
n.
X
(Motor Phase
Selection). Match the
linear encoder direc-
tion and motor direc-
tion.
Polarity detection was not
performed correctly.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between
±
10
°
.
Correct the settings for
the polarity detection-
related parameters.
−
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference
