1-40 Chapter 1: Alarms
QUICK SIX
1. Input command pulse
frequency exceeded the
permissible instantaneous speed
frequency.
Set command pulses 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/deceleration time
constant.
4. Electronic gear ratio is large
(parameters No. 4, 5)
Set correctly.
AL.31 Overspeed Speed has
exceeded the
instantaneous
permissible speed.
5. Encoder faulty. Change the servo motor.
1. Short occurred in servo
amplifier output phases U, V and
W.
Correct the wiring.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (AL.32) occurs if power is
switched on after U, V and W are
disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
Correct the wiring.
AL.32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
1. Lead of built-in regenerative
brake resistor or regenerative
brake option is open or
disconnected.
1. Change lead.
2. Connect correctly.
2. Regenerative transistor faulty. Change servo amplifier
3. Wire breakage of built-in
regenerative brake resistor or
regenerative brake option
1. For wire breakage of built-in
regenerative brake resistor, change
servo amplifier.
2. For wire breakage of regenerative
brake option, change regenerative
brake option.
4. Capacity of built-in regenerative
brake resistor or regenerative
brake option is insufficient.
Add regenerative brake option or
increase capacity.
AL.33 Overvoltage Converter bus
voltage exceeded
400V.
5. Power supply voltage high. Review the power supply.
1. Pulse frequency of the manual
pulse generator is too high.
Change the pulse frequency to a
proper value.
2. Noise entered the pulses of the
manual pulse generator.
Take action against noise.
AL.35 Command pulse
frequency error
Input pulse
frequency of the
command pulse is
too high.
3. Manual pulse generator failure Change the manual pulse generator.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier. AL.37 Parameter error Parameter setting
is wrong.
2. Regenerative brake option not
used with servo amplifier was
selected in parameter No.0.
Set parameter No.0 correctly.
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