Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
28
Under current
(uC)
Low current detection
Action and Reset
Action condition Pr.06-71
Action time Pr.06-72
Fault treatment parameter
Pr.06-73
0: No function
1: warn and coast to stop
2: warn and ramp to stop by the 2
nd
deceleration time
3: warn and continue operation
Reset method
Auto
When Pr.06-73=3, uC is a “Warning”. The warning is
automatically cleared when the output current > (Pr.06-71 + 0.1
A).
Manual
When Pr.06-73=1 or 2, uC is a “Fault”. You must reset manually.
Reset condition Immediately reset
Record When Pr.06-73=1 or 2, uC is a “Fault”, and the fault is recorded.
Cause Corrective Actions
Motor cable disconnection Troubleshoot the connection between the motor and the load.
Improper setting of low-current
protection
Reset Pr.06-71, Pr.06-72 and Pr.06-73 to proper settings.
The load is too low.
Check the load status.
Check if the motor capacity matches the load.
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