Yaskawa CIMR-AU 200V Drives User Manual

Page 212

The braking transistor is damaged

• Cycle power to the drive and check for reoccurrence of the fault.
• Replace either the control board or the entire drive. For instructions on replacing the control board,

contact Yaskawa or a Yaskawa representative.

The control circuit is damaged

Digital Operator Display

Fault Name

<1>

Output Short Circuit or IGBT Fault
Short circuit or ground fault is detected.

<1> Available in drive software versions PRG: 1015 and later.

SEr

Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the value set to b3-19.

STo

Pull-Out Detection
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.

SvE

Zero Servo Fault
Position deviation during zero servo.

<1>

THo

Thermistor Disconnect
The thermistor that detects motor temperature has become disconnected.

<1> Detected in models 4A0930 and 4A1200.

UL3

Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the

allowable time (L6-03).

Cause

Possible Solution

Parameter settings are not appropriate for the

load

Check the settings of parameters L6-02 and L6-03.

There is a fault on the machine side

Check the load for any problems.

Digital Operator Display

Fault Name

UL4

Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the

allowable time (L6-06).

UL5

Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.

<1>

UnbC

Current Unbalance
Current flow has become unbalanced.

<1> Detected in models 4A0930 and 4A1200.

Uv1

DC Bus Undervoltage
One of the following conditions occurred while the drive was running:
• Voltage in the DC bus fell below the undervoltage detection level (L2-05).
• For 200 V class drives: approximately 190 V
• For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400)
• For 600 V class drives: approximately 475 V
The fault is output only if L2-01 is set to 0 or 1 and the DC bus voltage has fallen below the level set to

L2-05 for longer than the time set to L2-02.

Cause

Possible Solution

Input power phase loss

• The main circuit drive input power is wired incorrectly.
• Correct the wiring.

One of the drive input power wiring terminals

is loose

• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.

Refer to Main Circuit

Wire Gauges and Tightening Torque on page 120

for details.

5.2 Fault Detection