YASKAWA SGM7D-30F Product Manual page 111

3.1 FT82 SERVOPACKs with Analog Voltage/Pulse Train References
3.1.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Servomotor
Does Not
Start
Servomotor
Moves
Instanta-
neously,
and Then
Stops
Servomotor
Speed Is
Unstable
3-42
Possible Cause
Torque control: The torque
reference input is not appro-
priate.
Position control: The refer-
ence pulse input is not
appropriate.
The /CLR (Position Deviation
Clear) input signal has not
been turned OFF.
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.
A failure occurred in the SER-
VOPACK.
There is a mistake in the Ser-
vomotor wiring.
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
There is a faulty connection
in the Servomotor wiring.
Confirmation
Check between the
torque reference input (T-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Check the setting of
Pn200 =n.X (Refer-
ence Pulse Form) and the
sign and pulse signals.
Check the /CLR signal
(CN1-14 and CN1-15).
Check the P-OT and N-
OT signals.
Check the /HWBB1 and
/HWBB2 input signals.
Check the FSTP signal.
–
Check the wiring.
Check the 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.
Continued from previous page.
Correction Reference
Correctly set the con-
*
trol method and input
method.
Correctly set the con-
*
trol method and input
method.
Turn OFF the /CLR sig-
*
nal.
Turn ON the P-OT and
*
N-OT 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.
• 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.
Replace the SERVO-
–
PACK.
Wire the Servomotor
–
correctly.
Wire the Serial Con-
–
verter Unit correctly.
Tighten any loose ter-
minals or connectors
–
and correct the wiring.
Continued on next page.