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Protective Functions
Undervoltage
1 1
The P-N voltage of the main power
converter is lower than the specified
voltage during Servo-ON.
1) The main power line voltage is too
2) Too small power source: The line
3) Open
4) The amplifier (circuit) failed.
Overvoltage
The line voltage is larger than the
1 2
error
specified acceptable range, so that the P-
N voltage of the converter is larger than
the specified value, or the line voltage
was raised by a advancing capacitor or
UPS (Uninterruptible Power Supply).
1) The internal regenerative
2) The external regenerative
3) The amplifier (circuit) failed.
Protection
low.An instantaneous outage occurred.
voltagedropped due to the in-rush
current at power on.
phase:
Operating
singlephase from the main power in
spite of 3phase specifications.
dischargeresistor is disconnected.
dischargeresistor is not suitable so that
regenerative energy cannot be
absorbed.
Cause
Measure the terminal-to-terminal voltage
(between L1, L2 and L3).
1) Increase
mainpower or replace it with a larger
one. Or remove the causes of the
failure of the magnetic contact, and
then restart the power source.
2) Increase
with
a
mainpower.
capacity, see "List of Applicable
Equipment".
3) Correct the phase (L1, L2 and L3)
connection of the main power. If the
main power is single-phase 100V or
singlephase 200V, use L1 and L3.
4) Replace with a new amplifier.
Measure the terminal-to-terminal voltages
(between L1, L2 and L3). Remove the
causes. Feed a power of correct voltage.
Except phase advancing capacitor
1) Measure the resistance value of the
external resistor installed between P
and B amplifier terminals using a tester.
If it read Åá, the connection is broken.
Replace the external resistor.
2) Use a resistor having the specified
resistance for specified rated power.
3) Replace with a new amplifier.
- 80 -
the
capacity
of
the
the
capacity
of
the
For
the
required
Countermeasures
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