DA98A AC Servo Drive Unit
User Manual
36
The load inertia is too large.
① Reduce the load inertia.
② Change the drive unit
and motor by larger
power ones.
Encoder zero fault
① Change the servo
motor.
② Adjust the encoder zero
by the manufacturer.
Occuring
as motor
is started
① Motor U, V, W lead wires are
wrongly connected.
② Lead wire of encoder cable
is wrongly connected.
Connect the wire
correctly.
Occuring
as control
power
supply is
powered
on
The circuit board fault
Change the AC servo
drive unit.
Occuring
as main
power
supply is
powered
on
① Power voltage is too high.
② Power voltage wave is
abnormal.
Check power supply.
Brake resistance connection is
broken off.
Connect it again.
① Brake transistor is damaged.
② Internal brake resistance is
damaged.
Change the AC servo
drive unit.
2
Main circuit
overvoltage
Occuring
as motor
is running
Capacity of brake circuit is not
enough.
① Reduce on-off
frequency.
② Increase acceleration
/deceleration time
constant.
③ Reduce the torque limit.
④ Reduce load inertia.
⑤ Change the drive unit
and motor with larger
power ones.
① Circuit board fault
② Fuse of power supply is
damaged.
③ Soft starting circuit fault
④ Rectifier is damaged.
Change the AC servo
drive unit.
Occuring
as main
power
supply is
powered
on
① Power voltage is low.
② Temporary power off is more
than 20ms.
Check power supply.
① Power capacity is not
enough.
② Instantaneous power down
Check power supply.
3
Main circuit
undervoltage
Occuring
as motor
is running
Radiator is overheated. Check loading.
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