Appendix 2 Protective And Diagnostic Functions Of The Digital Operator; Fault Detection - YASKAWA VARISPEED-656RC5 Instruction Manual

APPENDIX 2
2.1

FAULT DETECTION

When the power regenerative unit detects a fault, the fault code is displayed on the
Digital Operator and the fault contact output operates.
When a fault has occurred, refer to the following table to identify and correct the
cause of the fault.
Use one of the following methods to reset the fault after restarting the power regen-
erative unit.
S
S
S
Table A-3 Fault Displays and Processing
Fault Display
PUF
IGBT, Fuse Failure
UV1
Dc Bus Undervolt
UV2
CTR PS Undervolt
UV3
MC Answerback
AUv
Ac Undervoltage
FdVe
Power F Fault
SrC
Power Supply Flt.
PROTECTIVE AND DIAGNOSTIC
FUNCTIONS OF THE DIGITAL OPERATOR
Turn ON the fault reset signal.
Press the RESET Key on the Digital Operator.
Turn the main circuit power supply OFF and then ON again.
Meaning
Fuse Blown
The fuse in the main circuit is
blown.
The main transistor has dam-
aged.
Main Circuit Undervoltage
The main circuit DC voltage is
below the undervoltage detec-
tion level (L2-05).
200 V class : Approx. 190 VDC
400 V class : Approx. 380 VDC
Control Power Fault
The control power supply volt-
age dropped.
Inrush Prevention Circuit Fault
A fault occurred in the inrush
prevention circuit.
AC Power Undervoltage
AC power undervoltage oc-
curred during running.
200 V class : Approx. 150 VAC
or less
400 V class : Approx. 300 VAC
or less
Power Supply Frequency
Fault
AC power supply frequency has
exceeded the setting value
(F1-10).
Power Supply Fault
The phase of the input power
supply has changed after turning
ON the control power supply.
APPENDIX 2 PROTECTIVE AND DIAGNOSTIC
Probable Causes
The output transistor has failed
because of a short-circuit or
overcurrent.
S An open-phase occurred with
the input power supply.
S A momentary power loss oc-
curred.
S The wiring terminals for the
input power supply are loose.
−
−
S An open-phase occurred with
the input power supply.
S A momentary power loss
occurred.
S The wiring terminals for the
input power supply are loose.
S The power supply fluctuations
occurred during running.
S Power loss occurred during
running.
S An open-phase occured with
the input power supply.
S A momentary power loss
occurred.
S The wiring terminals for the
input power supply are loose.
Corrective Actions
Replace the power regenerative
unit after correcting the cause.
Reset the fault after correcting its
cause.
S Try turning the power supply
off and on.
S Replace the power regenera-
tive unit if the fault continues
to occur.
S Try turning the power supply
off and on.
S Replace the power regenera-
tive unit if the fault continues
to occur.
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
57