LED Operator Display
Fault Name
oPr
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
Note:
An oPr fault will occur when both of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1)
• The run command is assigned to the operator (b1-02 = 0 and LOCAL has been
selected)
Cause
Possible Solution
External operator is not properly
connected to the drive.
• Check the connection between the operator and the drive
• Replace the cable if damaged
• Turn off the drive input power and disconnect the operator. Next reconnect the
operator and turn the drive input power back on.
LED Operator Display
Fault Name
ov
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
Cause
Possible Solution
Deceleration time is too short and
regenerative energy flows from the
motor into the drive.
• Increase the deceleration time (C1-02, C1-04).
• Install a braking resistor or a dynamic braking resistor unit.
• Enable stall prevention during deceleration by setting L3-04 to 1.
Stall prevention is enabled as the default setting.
Excessive braking load.
The braking torque was too high, causing regenerative energy to charge the DC
bus.
Reduce the braking torque, use a braking option, or lengthen decel time.
Surge voltage entering from the
drive input power.
Install a DC reactor.
Note:
Voltage surge can result from thyristor convertor and phase advancing
capacitor using same drive main input power supply.
Ground fault in the output circuit
causing the DC bus capacitor to
overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Excessive regeneration when
overshoot occurs after acceleration. Lengthen the S-curve at acceleration end.
Drive input power voltage is too
high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The dynamic braking transistor is
damaged.
Replace the drive.
The braking transistor is wired
incorrectly.
• Check braking transistor wiring for errors
• Properly rewire the braking resistor device.
Drive fails to operate properly due
to noise interference.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit
lines, main circuit lines and ground wiring.
5.4 Fault Detection
144
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
