YASKAWA F7 User Manual page 133

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Digital
Operator Display
Input Phase Loss
PF
Drive input power supply has an open phase
Input Pha Loss
or has a large imbalance of voltage.
Detected when L8-05 = 1 (enabled).
PG Disconnection (Detection with
Software)
Detected when F1-02 = 0 to 2 and
PGO
A1-02 = 1 or 3.
PG Open
Detected when no PG (encoder) pulses are
received for a time longer than the setting in
F1-14.
PG Disconnection (Detection with
PGOH
Hardware)
PG Open
Detected when F1-02 - 0 to 2 and F1-25 = 1
HARDWARE
(PG-T2 or PG-Z2) and / or F1-26 = 1 (PG-
Z2) and A1-02 = 1 or 3.
<3021>
Detected when no PG (encoder) pulses are
received.
DC Bus Fuse
Detects if the DC bus fuse has opened.
PUF
Warning:
DC Bus Fuse Open
Never run the Drive after replacing the
DC bus fuse without checking for shorted
components.
Dynamic Braking Resistor
The protection of the heatsink mount
resistor is activated when L8-01 = 1.
RH
This fault is only applicable when using the
DynBrk Resistor
3% duty cycle resistor, which is mounted on
the Drive's heatsink. For all other resistors,
set L8-01 = 0.
Dynamic Braking Transistor
RR
The built-in dynamic braking transistor is
DynBrk Transistr
not operating properly.
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Table 6.1 Fault Displays and Processing (continued)
Description
Diagnostics & Troubleshooting 6 - 8
Aotewell
Email: Sales@aotewell.com
Cause
Open phase on the input of the
Drive.
Loose terminal screws at
R/L1, S/L2 or T/L3.
Momentary power loss
occurred.
Input voltage fluctuation too
large.
There was a break in the PG
wiring.
The PG was wired incorrectly.
Power wasn't being supplied
to the PG.
Braking mechanism is
possibly engaged.
There is a break in the PG
wiring.
The PG was wired incorrectly.
Power is not being supplied to
the PG.
—
Shorted output transistor(s) or
terminals.
Overhauling load, extended
dynamic braking duty cycle,
defective dynamic braking
resistor.
Started dynamic braking tran-
sistor high DC bus voltage,
defective dynamic braking
resistor.
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Corrective Action
Check the input voltage.
Tighten the terminal screws.
Check the input voltage.
Check the input voltage.
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 the proper power required
by the PG encoder.
Check for an open circuit when
using the brake (motor).
Remove power from the Drive.
Disconnect the motor.
Perform the checks without power
in Table 6.6.
Replace the shorted component(s).
Replace the defective fuse.
Verify dynamic braking duty
cycle.
Monitor DC bus voltage.
Replace dynamic braking
resistor.
Cycle power to the Drive.
Replace defective dynamic
braking transistor or resistor.
Monitor DC bus voltage.