YASKAWA A1000 Series Technical Manual

6.4 Fault Detection
316 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Digital Operator Display Fault Name
PF
Input Phase Loss
Drive 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 specified in this manual. Refer to Wire Gauges and Tightening Torque on page 66
There is excessive fluctuation in the drive input power
voltage.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
There is poor balance between voltage phases. • Stabilize drive input power or disable phase loss detection.
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 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 cable is not connected properly.
Cause Possible Solution
PG cable is disconnected. Reconnect the cable.
Digital Operator Display Fault Name
rF
Braking Resistor Fault
The resistance 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.
Regenerative converter, regenerative unit, or braking
unit is being used.
Disable the braking transistor protection selection (set L8-55 to 1).
Digital Operator Display Fault Name
rH
Braking Resistor Overheat
Braking 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
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 (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 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 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 334.
• 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.
Digital Operator Display Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the number set to b3-19.
Cause Possible Solution
Speed Search parameters are set to the wrong values.
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
The motor is coasting in the opposite direction of the
Run command.
Enable Bi-Directional Speed Search (b3-14 = 1).

YASKAWA A1000 Series Specifications

General

Series	A1000
Type	AC Drive
Altitude	Up to 1000m without derating
Output Frequency	0-400 Hz
Control Method	V/f Control
Overload Capacity	150% for 60 seconds
Communication Options	Modbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature	-10 to 50°C
Storage Temperature	-20 to 60°C
Humidity	5% to 95% (non-condensing)
Enclosure Rating	IP20
Horsepower	0.5 to 1000 HP
Power Range	0.4 - 630 kW (varies by voltage and model)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheat
Cooling Method	Fan Cooled
Safety	Safe Torque Off (STO)