12 Fault Code and Countermeasures
246 SD780 Series Servo Technical Manual
Er.510
Over-speed
1. Check whether there is any problem with the motor wiring and whether the
UVW three-phase connection is reversed.
2. Confirm that the encoder connection is abnormal.
3. Check if the maximum speed setting in the motor parameters is correct.
4. Check whether the input command exceeds the over-speed value.
5. Reduce the servo gain or set a certain smoothing time.
Er.511
Divided pulse
output speed
1. Reduce the number of divided output pulses per revolution (Pn070).
2. If the working conditions are allowed, you may reduce the motor speed.
Er.520
Vibration alarm
1. If the working conditions are allowed, you may reduce the motor speed or
reduce the speed loop gain.
2. correctly set the rotary inertia ratio.
3. properly set the vibration detection value (Pn187) and vibration detection
sensitivity (Pn186).
Er.550
Abnormal maximum
speed setting
Er.710
Overload
(instantaneous
maximum load)
1. Check if the motor is stalled during operation.
2. Check whether there is any problem with the motor wiring (phase sequence,
connection) and encoder wiring.
3. consider the operating conditions and load and determine if the driver or
motor selection is reasonable.
4. Observe whether there is large vibration in the running process of the motor.
If there is a large noise, adjust the gain parameter to eliminate noise or jitter. At
the same time, you can use the virtual oscilloscope to monitor whether the
motor output torque is abnormal or not.
Er.720
Overload
(continuous
maximum load)
1. Check whether there is any problem in the motor wiring (phase sequence
and connection) and encoder wiring.
2. consider the operating conditions and load and determine the driver or motor
selection is reasonable.
3. Observe whether the motor has large jitter during operation. If there is a huge
noise, adjust the gain parameter to eliminate noise or jitter. Also, use a virtual
oscilloscope to monitor whether the motor output torque is abnormal.
Er.730
DB overload 1
1. The load is too heavy when the machine stops that cause the overload of DB
resistor and you could try to reduce the operating speed or reduce the load.
2. check whether the motor is driven by external force.
3. according to customer needs, re-evaluate whether it needs to pass the DB
mode requirements during the shutdown, if you do not need, you can choose
other ways to stop.
4. If the fault is reported in the last operation, run after waiting for a while after
powering on.
Er.731
DB overload 2
1. Reduce the command speed of servo motor.
2. Reduce the moment of inertia ratio.
3. Servo driver problem, replace servo.
Er.740
Inrush current
limiting resistance
fault
1. The servo driver is faulty. Replace the servo driver.
Er.7A0
Heat sink over-heat
1. Check whether the air duct is blocked and the fan is damaged with a fan
drive.
2. Check the installation conditions of the driver, whether the heat dissipation
condition is good or not and increase the heat dissipation condition of the driver
as much as possible.
3. Check the drive load conditions, if the load is too heavy, you can suggest that
customers replace a high-power segment of the drive.
4. If possible, reduce the driver carrier frequency.
