Chapter
5
Troubleshooting
27
Fault Code
ERR05, ERR06, ERR07
Fault Principle
Overvoltage during running
After the fault occurs, view the value of F9-23. If the value exceeds the software overvoltage
protection value, it indicates that overvoltage occurs on the servo drive. The software overvoltage
protection value is 400 V for 2T, 790 V for T, and 890 V for 5T.
Fault Cause
Solution
Resistance of braking
resistor too large
Disconnect the braking resistor from the braking unit, and measure the
resistance of the braking resistor by using a multimeter. Compare the
measured value with the recommended value in section 2.2 “Selection of
Braking Unit and Braking Resistor”. If there is a large difference between the
two values, replace the braking resistor. If the resistance of the braking
resistor is normal, check whether the braking unit is faulty.
Braking unit faulty
Disconnect cables between the +, - terminals of the braking unit and the
servo drive, and measure the braking unit by using the diode function of the
multimeter with the red probe connected to - and black probe connected to
+. If a voltage drop of about 0.3 V is displayed, it indicates that the braking
unit is normal; otherwise, the braking unit is damaged.
Note: When you connect the +, - terminals of the braking unit to the servo
drive again, ensure correct wiring; if the wiring sequence is reversed, the
servo drive will be damaged.
Three-phase AC power
Safety contactor
R
S
T
U
V
W
Servo motor
PE BR P(+)
Braking unit
Braking
resistor
Main circuit
terminals of IS300
Voltage too high
Check whether the mains voltage changes greatly. If the mains voltage is
20% higher than the rated voltage, overvoltage is likely to occur during
running. When overvoltage occurs, stop the servo drive immediately and
find the causes.
Fault Code
ERR09
Fault Principle
Mains voltage too low
Fault Cause
Solution
Mains voltage lower
than 85% of the rated
voltage
Measure the actual mains voltage by using a multimeter. If the measured
voltage is lower than 85% of the rated voltage, start the servo drive only
after the voltage restores to normal. If the mains voltage is not too low but
this alarm still exists, check whether the voltage fluctuates greatly. In this
case, load change may cause even larger voltage fluctuation and drop.