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Protective Functions: Causes and Corrections
Alarm
Protection
Code No.
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 low.
An instantaneous outage occurred.
2) Too small power source: The line voltage
dropped due to the in-rush current at
power on.
3) Open phase: Operating with a single
phase from the main power in spite of 3-
phase specifications.
4) The amplifier (circuit) failed.
The line voltage is larger than the
1 2
Overvoltage
specified acceptable range, so that
error
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 discharge
resistor is disconnected.
2) The external regenerative discharge
resistor is not suitable so that regenerative
energy cannot be absorbed.
3) The amplifier (circuit) failed.
C a u s e
- 61 -
C o u n t e r m e a s u r e s
Measure the terminal-to-terminal volt-
age (between L1, L2 and L3).
1) Increase the capacity of the main
power or replace it with a larger one.
Or remove the causes of the failure
of the magnetic contact, and then re-
start the power source.
2) Increase the capacity of the main
power. For the required capacity, see
"List of Applicable Equipment".
3) Correct the phase (L1, L2 and L3) con-
nection of the main power. If the main
power is single-phase 100V or single-
phase 200V, use L1 and L3.
4) Replace with a new amplifier.
Measure the terminal-to-terminal volt-
ages (between L1, L2 and L3). Re-
move the causes. Feed a power of
correct voltage. Except phase ad-
vancing capacitor
1) Measure the resistance value of the exter-
nal resistor installed between P and B am-
plifier terminals using a tester. If it read Åá,
the connection is broken. Replace the ex-
ternal resistor.
2) Use a resistor having the specified resis-
tance for specified rated power.
3) Replace with a new amplifier.
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