YASKAWA F7 User Manual page 134

http://www.aotewell.com
Digital
Operator Display
SER
Exceeded Allowable Number of Speed
Search Retry Err
Search Retries
The speed search has been retried more than
<3021>
the number of tries set in b3-19 (Number of
speed search retrials).
Zero Servo Fault
SVE
The motor position moved more than
Zero Servo Fault
10,000 revolutions during zero servo
operation.
Undertorque Detection 1
UL3
Drive output current < L6-02 for more than
Undertorq Det 1
the time set in L6-03 when L6-01 = 7 or 8.
Undertorque Detection 2
UL4
Drive output current < L6-05 for more than
Undertorq Det 2
the time set in L6-06 when L6-04 = 7 or 8.
DC Bus Undervoltage
208-240Vac: Default trip point is ≤ 190Vdc
UV1
480Vac: Default trip point is ≤ 380Vdc
DC Bus Undervolt
Trip point is adjustable in L2-05.
Detected when the DC bus voltage is
≤ L2-05.
Control Power Supply Undervoltage
UV2
Undervoltage of the control circuit when
CTL PS Undervolt
running.
Soft Charge Circuit Fault
UV3
The pre-charge contactor opened while the
MC Answerback
Drive was running.
Tel: +(86) 755 8660 6182
Aotewell
Table 6.1 Fault Displays and Processing (continued)
Description
Diagnostics & Troubleshooting 6 - 9
Aotewell
Email: Sales@aotewell.com
Cause
The settings in b3-17 and
b3-18 are not appropriate.
The torque limit was too small. Increase the torque limit.
The load torque was too large.
Control circuit fault
Motor was underloaded.
Motor was underloaded.
Low input voltage at R/L1,
S/L2 and T/L3.
The acceleration time is set too
short.
Voltage fluctuation of the input
power is too large.
External load was
pulling down the Drive's
power supplies, or there was
an internal short in the power/
gate Drive board.
Contacts on the soft charge
contactor were dirty and the
soft charge contactor does not
function mechanically.
http://www.aotewell.com
Corrective Action
Make sure that the settings in
b3-17 and b3-18 are appropriate.
Reduce the load torque.
Check for signal noise.
Ensure the values in L6-02 and
L6-03 are appropriate.
Check application/machine status
to eliminate fault.
Ensure the values in L6-05 and
L6-06 are appropriate.
Check application/machine status
to eliminate fault.
Check the input circuit and
increase the input power to within
specifications.
Extend the time in C1-01 or other
active accel settings used such as
C1-03, C1-05, or C1-07 (time).
Check the input voltage.
Cycle power to the Drive.
Remove all control wiring and test
Drive or disconnect control
terminal strip.
Repair or replace the Power PCB/
Gate Drive PCB.
Cycle power to the Drive.
Check the condition of the soft
charge contactor.
Repair or replace the Power PCB/
Gate Drive PCB.