Protective And Diagnostic Functions; Fault Detection - YASKAWA CIMR-ACA4011 Instruction Manual

Protective and Diagnostic Functions

This section describes alarm features available in the MxC. The alarm functions include fault detection,
alarm detection, operation error detection, and Auto-Tuning error detection.

Fault Detection

When the MxC detects a fault, a fault contact output is triggered and the operator screen will display the
appropriate fault code. The MxC output is shut off, which causes the motor to coast to a stop. The user may
select how the MxC should stop the motor for some faults, and MxC will obey the specified stop method when
those faults occur. A fault code is displayed on the digital operator.
If a fault occurs, refer to the following table to identify and correct the problem that caused the fault.
Use one of the following methods to reset the fault before restarting the MxC:
Set a multi-function digital 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.
•
Cycle power to the MxC (i.e., turn the main circuit power supply off and back on again).
•
IMPORTANT
Display
The display of the digital operator
No display
shows nothing.
Overcurrent
OC
The MxC output current exceeded the
Overcur-
overcurrent detection level. (200% of
rent
rated current)
-2
7
A fault may occur if there is a short between the +V, -V, and AC terminals. Be sure the terminals have been
wired properly.
Table 7.1 Fault Displays and Processing
Meaning Probable Causes
The wiring is incorrect.
The digital operator is not connected
properly.
A short circuit occurred in the main
circuit or control fuse.
• A short-circuit or ground fault
occurred at the MxC output. A short
or ground fault may be due to a
damaged motor, worn insulation, or
a bad cable.
• The load is too large or the accel/
decel time is too short.
• A special-purpose motor or motor
with a capacity too large for the
MxC is being used.
• A magnetic contactor for the MxC
output was opened or closed.
The PG wiring is broken or doesn't
have a good connection.
The PG is wired incorrectly.
The PG is not receiving enough
power.
Corrective Actions
Check and correct the wiring on
the MxC input end.
• Reconnect the digital operator.
• Replace the digital operator.
Replace the MxC.
Clear the fault after cycling power
or removing the cause of the prob-
lem.
Note: Before turning the power
back on again, make sure that
there is no short-circuit or ground
fault for the MxC output.
Fix any broken or loose wiring.
Properly rewire the PG.
Supply the required amount of
power to the PG.