Protective And Diagnostic Functions; Fault Detection - YASKAWA Varispeed CIMR-G7A Instruction Manual

Protective and Diagnostic Functions

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

Fault Detection

When the Inverter detects a fault, the fault contact output operates, and the Inverter 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 before restarting the Inverter:
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 Inverter output current exceeded
Over Cur-
the overcurrent detection level. (200%
rent
of rated current)
Ground Fault
GF
The ground fault current at the
Ground
Inverter output exceeded approxi-
Fault
mately 50% of the Inverter rated out-
put current.
PUF
Main IBGT Fuse Blown
Fuse The fuse in the main circuit is blown.
Blown
* The ground fault here is one which occurs in the motor wiring. A ground fault with low resistance which occurs in motor cables or terminals may not be detected.
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7
Table 7.1 Fault Displays and Processing
Meaning
• A short-circuit or ground fault
occurred at the Inverter 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
Inverter is being used.
• A magnetic switch was switched at
the Inverter output.
*
A ground fault occurred at the Inverter
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 Inverter output.
Check whether there is a short-circuit
between the following terminals. A
short-circuit will damage the output
transistor:
B1 (
←→ U, V, W
Probable Causes
3) ←→ U, V, W
Corrective Actions
Reset the fault after correcting its
cause.
Reset the fault after correcting its
cause.
Replace the Inverter after correct-
ing the cause.