YASKAWA CIMR-JC4A0002BAA Quick Start Manual page 138

LED Operator Display
oPr
Cause
External operator is not properly
connected to the drive.
LED Operator Display
ov
Cause
Deceleration time is too short and
regenerative energy flows from the
motor into the drive.
Excessive braking load.
Surge voltage entering from the
drive input power.
Ground fault in the output circuit
causing the DC bus capacitor to
overcharge.
Excessive regeneration when
overshoot occurs after acceleration. • Lengthen the S-curve at acceleration end.
Drive input power voltage is too
high.
The dynamic braking transistor is
damaged.
The braking transistor is wired
incorrectly.
Drive fails to operate properly due
to noise interference.
YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
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)
• 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.
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)
• Increase the deceleration time (C1-02, -04).
• Install a braking resistor or a dynamic braking resistor unit.
• Enable stall prevention during deceleration (L3-04 = "1").
Stall prevention is enabled as the default setting.
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.
Install a DC link choke.
Note: Voltage surge can result from thyristor convertor and phase advancing
capacitor using same drive main input power supply.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
Replace the drive.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
• 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.
http://nicontrols.com
5.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
5
137