3.1 FT82 SERVOPACKs with Analog Voltage/Pulse Train References
3.1.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
3-42
Servomotor
Does Not
Start
Torque control: The torque
reference input is not appro-
priate.
Check between the
torque reference input (T-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Correctly set the con-
trol method and input
method.
*
Position control: The refer-
ence pulse input is not
appropriate.
Check the setting of
Pn200 =n.
X (Refer-
ence Pulse Form) and the
sign and pulse signals.
Correctly set the con-
trol method and input
method.
*
The /CLR (Position Deviation
Clear) input signal has not
been turned OFF.
Check the /CLR signal
(CN1-14 and CN1-15).
Turn OFF the /CLR sig-
nal.
*
The P-OT (Forward Drive
Prohibit) or N-OT (Reverse
Drive Prohibit) signal is still
OFF.
Check the P-OT and N-
OT signals.
Turn ON the P-OT and
N-OT signals.
*
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 function, con-
nect the Safety Jumper
Connector (provided as
an accessory) 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 = n.
X
(FSTP (Forced Stop
Input) Signal Alloca-
tion) to disable the
signal.
*
A failure occurred in the SER-
VOPACK.
–
Replace the SERVO-
PACK.
–
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in the Ser-
vomotor wiring.
Check the wiring.
Wire the Servomotor
correctly.
–
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
Check the wiring.
Wire the Serial Con-
verter Unit correctly.
–
Servomotor
Speed Is
Unstable
There is a faulty connection
in the Servomotor wiring.
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable. Check the wir-
ing.
Tighten any loose ter-
minals or connectors
and correct the wiring.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference