Troubleshooting Of Warnings; Warning Displays - YASKAWA SGMJV User Manual

10.2.2 Troubleshooting of Warnings

Refer to the following table to identity the cause of a warning and the action to be taken. Contact your
Yaskawa representative if the problem cannot be solved by the described corrective action.
Warning
Warning Name
Display
Position Error
A.900
Pulse Overflow
Position Error
Pulse Overflow
A.901
Alarm at Servo
ON
Overload:
Warning before
A.910
alarm A710 or
A720 occurs
Situation at Warning
Occurrence
Wiring of the servomo-
Check the wiring of the cable for
tor U, V, or W line is
motor main circuit.
incorrect.
The SERVOPACK gain
Check the SERVOPACK gain.
is too low.
The position reference
Lower the position reference pulse
pulse frequency is too
frequency.
high.
The position reference Lower the position reference accelera-
acceleration is too high. tion.
The excessive position
error alarm level
Check the excessive position error
(Pn520) is too low for
alarm level (Pn520).
the operating condi-
tions.
A SERVOPACK fault
−
occurred.
When the /S_ON signal
was OFF, the servomo-
tor moved without
cleaning the counter for
−
position error pulses.
The number of position
error pulses exceeded
the maximum number
of pulses allowed.
The servomotor or
encoder wiring is incor-
Check the wiring.
rect or the connection is
faulty.
The servomotor is in
excess of the overload Check the overload characteristics of
protective characteris- the servomotor and reference input.
tics.
The servomotor is not
driven due to a mechan-
Check the reference input and motor
ical factor and the oper-
speed.
ating load has become
excessive.
A SERVOPACK fault
−
occurred.
Cause
Check whether there is any loose con-
nection in motor wiring or encoder
wiring.
Increase the servo gain by using the
function such as advanced autotuning.
Lower the position reference pulse
frequency or the position reference
acceleration, or correct the electronic
gear ratio.
Apply a smoothing function, such as a
position reference acceleration/decel-
eration time constant (Pn216).
Set an appropriate value for the
Pn520.
Turn the power supply OFF and then
ON again. If the alarm still occurs, the
SERVOPACK may be faulty. Replace
the SERVOPACK.
Set Pn200.2 to 0 to clear the number
of position error pulses when the
/S_ON signal is OFF. Or set an appro-
priate value for the excessive position
error warning level at servo ON
(Pn528) when the /S_ON signal is
ON.
Correct the servomotor and encoder
wiring if they are wrong.
Reconsider the load and operation
conditions.
Or, check the servomotor capacity.
Improve the mechanical factor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.

10.2 Warning Displays

Corrective Actions
10-21
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