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9. TROUBLESHOOTING
Display
Name
Definition
Cause
Action
(Note 2)
Alarm details
AL.31 Overspeed
Speed has
exceeded the
instantaneous
permissible speed.
1. Input command pulse frequeroy is too
high.
Set command pulse
frequency correctly.
2. Small acceleration/deceleration time
constant caused overshoot to be large.
Increase acceleration/
deceleration time constant.
3. Servo system is instable to cause
overshoot.
1. Re-set servo gain to
proper value.
2. If servo gain cannot be
set to proper value.
1) Reduce load inertia
moment ratio; or
2) Reexamine
acceleration/decelerati
on time constant.
4. Electronic gear ratio is large.
(Setting by parameters No. PA06, PA07)
Set correctly.
5. Encoder faulty.
Change the servo motor.
AL.32 Overcurrent
Current that flew is
higher than the
permissible
current of the
driver.
1. Short or ground fault occurs at a servo
motor power cable.
(A sheath of a servo motor power cable
deteriorated, resulting in short or ground
fault.)
<Checking method>
The servo motor power cables (U, V, W) are
disconnected on the servo motor terminal
side. After that, the servo motor is turned on,
and the alarm (AL.32) occurs.
Repair the cable.
2. External dynamic brake fault
<Checking method>
The servo motor power cables (U, V, W) are
disconnected on the external dynamic brake
terminal side. After that, the servo motor is
turned on, and the alarm (AL.32) does not
occur.
1. Check parameters and the
dynamic brake interlock.
2. Replace the external dynamic
brake.
3. Driver fault.
<Checking method>
The servo motor power cables (U, V, W) are
disconnected. After that, the servo motor is
turned on, and the alarm (AL.32) occurs.
Change the driver.
4. Servo motor fault.
<Checking method>
The servo motor power cables (U, V, W) are
disconnected on the external dynamic brake
terminal side. After that, the servo motor is
turned on, and the alarm (AL.32) does not
occur.
Change the servo motor.
5. External noise caused erroneous operation
to the overcurrent detection circuit.
<Checking method>
1. Check that the driver is not influenced by
noise of magnetic valves, magnetic
contactors or relays.
2. Check the grounding of the driver and the
servo motor.
Ground correctly or take noise
reduction measures.
6. Encoder fault.
Change the servo motor.
2
Содержание LECSB Series
Страница 1: ...PRODUCT NAME AC Servo Motor Driver MODEL Series LECSB Series Doc no JXC OMT0021 B ...
Страница 17: ...7 App 6 Compliance with the European EC directives App 7 App 7 Conformance with UL C UL standard App 10 ...
Страница 255: ...10 1 10 OUTLINE DRAWINGS 10 OUTLINE DRAWINGS 2 10 1 Driver 2 10 2 Connector 4 ...