5.2 Troubleshooting for Malfunctions when Alarm Indicators Are Not Lit
52
Servomotor
turns for a
moment and
stops.
The wiring of the servomotor
main circuit cable and
encoder cable is incorrect.
Check the order of phases U,
V, and W in the servomotor
main circuit cable and the
wiring of the encoder cable.
Correct the wiring.
Servomotor
turns even
without a ref-
erence.
The reference pulse input is
not correct.
Check the reference pulse
type.
Set the suitable reference
pulse type.
Check the voltage of the ref-
erence pulse.
Connect a resistor according
to the voltage.
The SERVOPACK is faulty.
−
Replace the SERVOPACK.
Servomotor
turns in the
wrong direc-
tion.
The CW and CCW inputs are
connected backward.
Check the reference pulse
types of the controller and
the SERVOPACK.
Connect the CW pulse signal
to the CW input and the CCW
pulse signal to the CCW
input.
Servomotor
operation is
not stable.
The servomotor main circuit
cable or encoder cable is not
wired correctly.
Check the wiring of the ser-
vomotor main circuit cable
phases U, V, and W and the
encoder cable.
Wire the cables correctly.
Misalignment of the coupling
connecting the servomotor
shaft and machine, loose
screws, or load torque
changes resulting form pul-
ley and gear engagement.
Check the coupling to the
machine system.
Review and adjust the
machine.
Operate the servomotor with
no load (i.e., disconnect the
servomotor from the
machine).
The load moment of inertia
exceeds the permissible
value of the SERVOPACK.
Operate the servomotor with
no load (i.e., disconnect the
servomotor from the
machine).
Reduce the load.
Replace the servomotor and
SERVOPACK with ones with
higher capacities.
The connection of the pulse
signal wires is incorrect.
Check the wiring of the pulse
signal wires of the host con-
troller and SERVOPACK.
Correct the wiring.
Check the reference pulse
types of the controller and
the SERVOPACK.
Set the pulse type of the
SERVOPACK according to
the reference pulse type of
the controller.
Motor over-
heated
The ambient temperature
around the servomotor is too
high.
Be sure that the ambient
temperature around the ser-
vomotor is 40
°
C or less.
Reconsider the installation
conditions so that the ambi-
ent temperature will be 40
°
C
or less. Cool down the servo-
motor with a fan or cooler.
The ventilation is obstructed.
Check to see if ventilation is
obstructed.
Provide good ventilation.
The servomotor is over-
loaded.
Operate the servomotor with
no load (i.e., disconnect the
servomotor from the
machine).
Reduce the load.
Replace the servomotor and
SERVOPACK with ones with
higher capacities.
The holding
brake does
not work.
The holding brake power is
turned ON.
Check to see if the holding
brake power is turned ON.
Design the circuit so that the
holding brake is turned OFF
when the holding brake
needs to hold the load when
the servomotor comes to a
stop.
Problem
Cause
Inspection Items
Corrective Action
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