6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 347
Digital Operator Display Fault Name
PF
Input Phase Loss
Driv
e input power has an open phase or has a large imbalance of voltage between phases. Detected when L8-05 = 1 (enabled).
Cause Possible Solution
There is phase loss in the drive input power.
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive input power terminals.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as sp
ecified in this manual. Refer to Wire Gauges and Tightening Torque on page 76
There is excessive fluctuation in the drive input power
volt
age.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
There is poor balance between vol
tage phases. • Stabilize drive input power or disable phase loss detection.
The main circuit capacitors are worn.
• Check the maintenance time for th
e capacitors (U4-05).
• Replace the main capacitor(s) if U4-05 is greater than 90%. For i
nstructions on replacing the capacitor(s), contact YASKAWA
or your nearest sales representative.
Check for anything 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 your
nearest sales 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 cab
le is not connected properly.
Cause Possible Solution
PG cable is disconnected. Reconnect the cable. Check the setting of F1-20.
Digital Operator Display Fault Name
rF
Braking Resistor Fault
The resis
tance of the braking resistor being used is too low.
Cause Possible Solution
The proper braking resistor option has not been
installed.
Select the braking resistor option so that fits to the drives braking transistor specification.
A regenerative converter, regenerative unit or braking
unit is being used and the +1 or +3 terminal is connected
to - terminal.
Disable the braking transistor protection selection (set L8-55 to 0).
Digital Operator Display Fault Name
rH
Braking Resistor Overheat
B
raking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
Cause Possible Solution
Deceleration time is too short and excessive regenerative
en
ergy is flowing back into the drive.
• Check the load, deceleration time, and speed.
• Reduce the load inertia.
• Increase the deceleration times (C1-01 to C1-08).
• Replace the dynamic braking option with a larger device t
hat can handle the power that is discharged.
The duty cycle is too high.
Chec
k the duty cycle.
Maximum of 3% duty cycle is available when L8-01 = 1.
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 (L8-01 = 1) allows a braking
duty cycle of maximum 3%.
The proper braking resistor has not been installed.
• Check the specifications and conditions for t
he 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 it is rated for trips 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
The braking transistor is damaged. • Cycle power to the drive and check if the fault reoccurs. Refer to Diagnosing and Resetting Faults on page 366.
• Replace either the control board
or the entire drive. For instructions on replacing the control board, contact YASKAWA or your
nearest sales representative.
The control circuit is damaged.
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