Yaskawa R1000 Series Power Regenerative Unit User Manual
Page 100
5.3 Fault Detection
100
YASKAWA ELECTRIC TOEP C710656 08B YASKAWA Power Regenerative Unit - R1000 Instruction Manual
Digital Operator
Display
Fault Name
Details
SRC
Phase Order Fault
The phase order detection direction for the input power supply changed after the power supply
was turned on.
Cause
Possible Solution
The power supply phase order changed during
operation.
Investigate and correct the cause and reset the fault.
Refer to
Diagnosing and Resetting Faults on page 112
.
A momentary power loss occurred.
An input power supply wiring terminal is loose.
The fluctuation in the voltage of the input
power supply is too large.
Digital Operator
Display
Fault Name
Details
Uv1
Main Circuit
Undervoltage
The following condition occurred in the regenerative unit when a Run Command was not being
input.
The main circuit DC voltage became equal to or lower than the set value of L2-05 (Undervoltage
Detection Level).
200 V Class: Approximately 190 V
400 V Class: Approximately 380 V
Cause
Possible Solution
A phase loss occurred in the input power
supply.
Check the wiring of the main circuit power supply for broken wires and wiring mistakes.
Correct the wiring.
An input power supply wiring terminal is loose.
Check the terminals for looseness.
Tighten the terminals to the tightening torque that is given in this manual. (See page
.)
Fluctuation occurred in the power supply
voltage.
Check the voltage.
• Correct the voltage so that it is within the range given in the power supply specifications of the
regenerative unit.
• If there is no problem with the main circuit power supply, check the magnetic contactor in the
main circuit for faults.
A power loss occurred.
Improve the power supply.
The main circuit capacitor circuit in the
regenerative unit has deteriorated.
Check the maintenance period for the capacitor in U4-05 (Capacitor Maintenance).
If the value of U4-05 has exceeded 90%, replace the board or the regenerative unit. For
information on board replacement, consult with your Yaskawa representative or the nearest
Yaskawa sales office.
The operation of the relay or contactor in the
inrush current protection circuit in the
regenerative unit failed.
Cycle the power supply and see if the fault occurs again.
• If the fault occurs repeatedly, replace the board or the regenerative unit. For information on
board replacement, consult with your Yaskawa representative or the nearest Yaskawa sales
office.
Check the maintenance period for the inrush prevention relay in U4-06 (Soft Charge Bypass
Relay Maintenance).
• If the value of U4-06 has exceeded 90%, replace the board or the regenerative unit. For
information on board replacement, consult with your Yaskawa representative or the nearest
Yaskawa sales office.
A fault occurred in the power supply device.
Check the wiring of the power supply device.
Correct the wiring.
A fault occurred in the power supply.
A fault occurred in the power supply.
A fault occurred in power supply voltage
detection.
Check the wiring.
Correct the wiring.
Digital Operator
Display
Fault Name
Details
Uv2
Control Power Supply
Voltage Fault
Voltage is too low for the control regenerative unit input power.
Cause
Possible Solution
Internal circuitry is damaged.
• Cycle power to the regenerative unit. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire regenerative unit. For
instructions on replacing the control board, contact Yaskawa or a Yaskawa representative.
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