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8.
Functions
8-1
Protective Functions
This servo amplifier incorporates various protective functions. When any of the protective functions is activated,
the servo amplifier turns OFF the alarm output signal (ALM) to trip. The 7-segment LEDs on the front panel
indicates the relevant error code No.
Protective
Error
function
code No.
The voltage between the P and N terminals of the control
power supply converter is lower than the specified value.
1) The power supply voltage is too low. Instantaneous
Control power
undervoltage
11
2) Power supply capacity is too low. The power supply
protection
3) The servo amplifier (circuit) is defective.
The power supply voltage is higher than the allowable
input voltage range.
The voltage between the P and N terminals of the
converter is higher than the specified value. The power
supply voltage is too high. A voltage rise attributable to
an advancing capacitor or UPS (uninterruptible power
supply) occurred.
Overvoltage
12
1) The regenerative discharge resistor is disconnected.
protection
2) The external regenerative discharge resistor is not
3) The servo amplifier (circuit) is defective.
When Servo parameter No.65 (Undervoltage error
response at main power-off) is 1, momentary power
failure occurred between L1 and L3 at least for the
duration set by Servo parameter No. 6D (main power-off
detection time), or the P-N voltage of the main power
converter dropped down to the specified value or less
during the servo-on.
Main power
1) The power supply voltage is too low. Instantaneous
undervoltage
13
protection
2) Occurrence of momentary power failure
3) Power supply capacity is too low. The power supply
4) Missing phase: The servo amplifier intended for 3-phase
5) The servo amplifier (circuit) is defective.
The current flowing into the converter is higher than the
specified value.
1) The servo amplifier is defective. (The internal
2) The motor cables (U, V and W) are short-circuited.
3) The motor cables (U, V and W) are grounded.
Overcurrent and
14
ground fault
4) The motor has burned out.
*
protection
5) Motor cable contact failure
6) The relay for the dynamic brake was melted and stuck
7) The motor is not compatible with the servo amplifier.
A4P
Cause
power failure occurred.
voltage dropped due to the in-rush current at power-on.
suitable, disabling regenerative energy absorption.
power failure occurred.
voltage dropped due to the in-rush current at
power-on.
input was driven by a single-phase power supply.
circuit, IGBT or other part is defective.)
due to frequent Servo-ON/OFF.
MOTOR COMPANY, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
No. SR-DSV09485
Countermeasure
Measure the voltages between the connectors (L1C and
L2C), and between the terminal blocks (r and t).
1) Increase the power supply voltage. Replace the
power supply.
2) Increase the power supply capacity.
3) Replace the defective amplifier with a new servo
amplifier.
Measure the voltages between the connectors (L1, L2,
L3). Apply a proper voltage to the power supply.
Remove the advancing capacitor.
1) Measure the resistance of the external resistor between the
P and B terminals of the servo amplifier by using a tester.
If the reading is "∞", the external resistor is disconnected.
Replace the external resistor.
2) Replace the external regenerative discharge resistor
with a resistor providing the specified resistance value
and W value.
3) Replace the defective servo amplifier with a new one.
Measure the voltages between the connectors (L1, L2 and
L3).
1) Increase the power supply voltage. Replace the
power supply. After removing the cause of the
electromagnetic relay trip in the main power supply,
turn ON the power supply again.
2) Check the set value of Servo parameter No.6D (main
power off detection time). Set each power phase
correctly.
3) Increase the power supply capacity. For the power
supply capacity, refer to "Servo Amplifier and
Compatible Peripheral Equipment List".
4) Properly connect each phase (L1, L2 and L3) of the power
supply. To use a single-phase 100 V and single-phase
200 V power supply, connect it between L1 and L3.
5) Replace the defective servo amplifier with a new one.
1) Disconnect the motor cables, and activate the
Servo-On signal. If this error occurs immediately
after that, replace the servo amplifier with a new one
(that works normally).
2) Check the connector leads to make sure that the motor
cables (U, V and W) are not short-circuited. Connect
the motor cables properly.
3) Check the insulation resistance between the motor
cables (U, V and W) and the ground cable. In case of
insulation failure, replace the motor.
4) Check the balance of the resistance between the motor
cables. If the resistance values are unbalanced,
replace the motor.
5) Check the motor connectors (U, V and W) for a
disconnected pin. If a connector pin is loose or
disconnected, fix it securely.
6) Replace the servo amplifier. Do not start or stop the
motor by using the Servo-ON/OFF signal.
7) Check the servo amplifier's part number (capacity)
indicated on the identification plate, and replace the
motor with a motor compatible with the servo
amplifier.
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