YASKAWA A1000 HHP Programming Manual page 198

2.4 Fault Detection
The main circuit capacitors are worn
Digital Operator Display
Cause
PG cable is disconnected
PG cable wiring is wrong
PG has no power
PG encoder brake is clamped shut
Digital Operator Display
Cause
PG cable is disconnected
Digital Operator Display
Cause
Main transistor failure, or one or more module
DC Bus Fuses is/are open
Digital Operator Display
Cause
The proper braking resistor option has not
been installed
Digital Operator Display
Cause
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive
Excessive braking inertia
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
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
Cause
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• 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.
PG Disconnect (for any control modes using a PG option card)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the cable.
Correct the wiring.
Check the power line to the PG encoder.
Ensure the motor brake releases properly.
PG Hardware Fault (detected when using a PG-X3 option card)
PGoH
PG cable is not connected properly.
Reconnect the cable and check the setting of F1-20.
Fuse is Open
PUF
One of the Module DC Bus Fuses is/are open.
• Use monitor U2-28 to identify the defective module(s)
• Replace or repair the defective module..
Braking Resistor Fault
rF
The resistance of the braking resistor is too low.
Select a braking resistor option that it fits the drive braking transistor specification.
Braking Resistor Overheat
rH
Braking resistor protection was triggered.
• 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.
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor
settings.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Dynamic Braking Transistor
rr
The built-in dynamic braking transistor failed.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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