The main circuit capacitors are worn
• Check the maintenance time for the capacitors (U4-05).
• Replace the capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor, contact
Yaskawa or a Yaskawa representative.
Check for problems with the drive input power. If drive input power appears normal but the alarm
continues to occur, replace either the control board or the entire drive. For instructions on replacing the
control board, contact Yaskawa or a Yaskawa representative.
Digital Operator Display Fault Name
PGo
PG Disconnect (for any control modes using a PG option card)
No PG pulses are received for longer than the time set to F1-14.
Cause Possible Solution
PG cable is disconnected Reconnect the cable.
PG cable wiring is wrong Correct the wiring.
PG has no power Check the power line to the PG encoder.
PG encoder brake is clamped shut Ensure the motor brake releases properly.
Digital Operator Display Fault Name
PGoH
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable is not connected properly.
Cause Possible Solution
PG cable is disconnected Reconnect the cable and check the setting of F1-20.
Digital Operator Display Fault Name
PUF
Fuse is Open
One of the Module DC Bus Fuses is/are open.
Cause Possible Solution
Main transistor failure, or one or more module
DC Bus Fuses is/are open
• Use monitor U2-28 to identify the defective module(s)
• Replace or repair the defective module..
Digital Operator Display Fault Name
rF
Braking Resistor Fault
The resistance of the braking resistor is too low.
Cause Possible Solution
The proper braking resistor option has not
been installed
Select a braking resistor option that it fits the drive braking transistor specification.
Digital Operator Display Fault Name
rH
Braking Resistor Overheat
Braking resistor protection was triggered.
Cause Possible Solution
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive
• Check the load, deceleration time, and speed.
• Reduce the load inertia.
• Increase the deceleration times (C1-02, C1-04, C1-06, C1-08, C1-09).
• Replace the dynamic braking option with a larger device that can handle the power that is discharged.
Excessive braking inertia
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor
settings.
The braking operation duty cycle is too high Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors
The proper braking resistor has not been
installed
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more
frequently than its rating permits will trip the alarm even when the braking resistor surface is not very hot.
Digital Operator Display Fault Name
rr
Dynamic Braking Transistor
The built-in dynamic braking transistor failed.
Cause Possible Solution
2.4 Fault Detection
198
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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