Protective And Diagnostic Functions; Fault Detection - YASKAWA G7 Series Technical Manual

Protective and Diagnostic Functions

This section describes the alarm functions of the Drive. The alarm functions include fault detection, alarm
detection, operation error detection, and autotuning error detection.

Fault Detection

When the Drive detects a fault, the fault contact output operates, and the Drive output is shut OFF causing the
motor to coast to a stop. (The stopping method can be selected for some faults, and the selected stopping
method will be used with these faults.) A fault code is displayed on the Digital Operator.
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 Drive:
Set a multi-function contact input (H1-01 to H1-05) to 14 (Fault Reset) and 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.
•
Display
Overcurrent
OC
The Drive output current exceeded the
Over Cur-
overcurrent detection level. (200% of
rent
rated current)
Ground Fault
GF
The ground fault current at the Drive
Ground
output exceeded approximately 50%
Fault
of the Drive rated output current.
PUF
Main IBGT Fuse Blown
Fuse The fuse in the main circuit is blown.
Blown
Main Circuit Overvoltage
OV The main circuit DC voltage exceeded
DC Bus the overvoltage detection level.
Fuse Open 200-240 V class: Approx. 410 V
380-380 V class: Approx. 820 V
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Table 7.1 Fault Displays and Processing
Meaning
• A short-circuit or ground fault
occurred at the Drive output. (A
short or ground fault can be caused
by motor burn damage, worn insu-
lation, or a damaged cable.)
• The load is too large or the accelera-
tion/deceleration time is too short.
• A special-purpose motor or motor
with a capacity too large for the
Drive is being used.
• A magnetic switch was switched at
the Drive output.
A ground fault occurred at the Drive
output. (A ground fault can be caused
by motor burn damage, worn insula-
tion, or a damaged cable.)
The output transistor has failed
because of a short-circuit or ground
fault at the Drive output.
Check whether there is a short-circuit
between the following terminals. A
short-circuit will damage the output
transistor:
B1 (
←→ U/T1, V/T2, W/T3
The deceleration time is too short and
the regenerative energy from the
motor is too large.
The power supply voltage is too high.
Probable Causes
3) ←→ U/T1, V/T2, W/T3
Corrective Actions
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
Replace the Drive after correcting
the cause.
Increase the deceleration time or
connect a braking resistor (or
Braking Resistor Unit).
Decrease the voltage so it's within
specifications.