YASKAWA F7 User Manual page 138

http://www.aotewell.com
Digital
Operator Display
DC Bus Overvoltage
The DC bus voltage has exceeded the trip
point.
OV
Default:
DC Bus Overvolt
208-240Vac: Trip point is 410Vdc
(Flashing)
480Vac: Trip point is 820Vdc
Detected when the Drive is in a stopped
condition. E1-01 affects the trip level.
PG Disconnection (Detection with
Software)
PGO
Detected when F1-02 = 3 and A1-02 = 1
PG Open
or 3.
Detected when no PG (encoder) pulses are
(Flashing)
received for a time longer than the setting in
F1-14.
PG Disconnection (Detection with
Hardware)
PGO H
Detected when F1-02 = 3 and F1-25 = 1
PG Open Hardware
(PG-T2 or PG-Z2) and / or F1-26 = 1
<3021>
(PG-Z2) and A1-02 = 1 or 3.
Detected when no PG (encoder) pulses are
received.
UL3
Undertorque Detection 1
Undertorq Det 1
Drive output current < L6-02 for more than
the time set in L6-03 when L6-01 = 5 or 6.
(Flashing)
UL4
Undertorque Detection 2
Undertorq Det 2
Drive output current < L6-05 for more than
the time set in L6-06 when L6-04 = 5 or 6.
(Flashing)
DC Bus Undervoltage
The DC bus voltage is ≤ L2-05.
UV
Default:
DC Bus Undervolt
208-240Vac: Trip point is 190Vdc
(Flashing)
480Vac: Trip point is 380Vdc
Detected while Drive is in a stopped
condition.
Tel: +(86) 755 8660 6182
Aotewell
Table 6.2 Alarm Displays and Processing (continued)
Description
Diagnostics & Troubleshooting 6 - 13
Aotewell
Email: Sales@aotewell.com
Cause
High input voltage at R/L1,
S/L2 and T/L3
The deceleration time is set too
short.
Power factor correction
capacitors are being used on the
input or output to the Drive.
There was a break in the PG
wiring.
The PG was wired incorrectly.
Power wasn't being supplied to
the PG.
Brake mechanism is
possibly engaged.
There was a break in the PG
wiring.
The PG was wired incorrectly.
Power wasn't being supplied to
the PG.
Brake mechanism is possibly
engaged
Motor was underloaded.
Motor was underloaded.
Low input voltage was at R/L1,
S/L2 and T/L3.
The acceleration time was set
too short.
Voltage fluctuation of the input
power was too large.
http://www.aotewell.com
Corrective Action
Check the input circuit and
reduce the input power to within
specifications.
Extend the time in C1-02 or other
active decel settings used such as
C1-04, C1-06, C1-08 or C1-09
(time).
Remove the power factor
correction capacitors.
Fix the broken / disconnected
wiring.
Fix the wiring.
Supply power to the PG properly.
Check for open circuit when
using brake (motor).
Fix the broken / disconnected
wiring.
Fix the wiring.
Supply power to the PG properly.
Check for open circuit when
using brake (motor).
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.