Mitsubishi Electric FR-D720-0.4K Instruction Manual page 187

(3) Stop operation selection at occurrence of communication fault (Pr. 502)
Stop operation when retry count exceeds (Mitsubishi inverter protocol only) or signal loss detection error occurs can be selected.
Operation at fault occurrence
Pr. 502 Setting
0 (initial value)
1
Decelerates to stop
2
Operation at fault removal
Pr.502 Setting
0 (initial value)
1
2 Automatic restart functions
Pr. 502 setting "0" (initial value)
Fault occurrence
Communication
OFF
fault
Fault display
(E.PUE)
Fault output
OFF
(ALM)
Pr. 502 setting "2"
Fault occurrence
Communication
OFF
fault
Fault display
(E.PUE)
Fault output
OFF
(ALM)
REMARKS
The fault output indicates fault output signal (ALM signal) or alarm bit output.
When the setting was made to provide a fault output, the fault description is stored into the faults history. (The fault description
is written to the faults history when a fault output is provided.)
When no fault output is provided, the fault record overwrites the fault indication of the faults history temporarily, but is not
stored.
After the fault is removed, the fault indication returns to the ordinary monitor, and the faults history returns to the preceding fault
indication.
When the Pr. 502 setting is "1 or 2", the deceleration time is the ordinary deceleration time setting (e.g. Pr. 8, Pr. 44, Pr. 45). In
addition, acceleration time for restart is the normal acceleration time (e.g. Pr. 7, Pr. 44).
When "2" is set in Pr. 502, run command/speed command at restart follows the command before an fault occurrence.
When "2" is set in Pr. 502 at occurrence of a communication error and the error is removed during deceleration, the inverter
accelerates again at that point.
Parameters referred to
Pr. 7 Acceleration time, Pr. 8 Deceleration time
Pr. 190, Pr. 192, Pr. 197 (output terminal function selection)
Operation
Coasts to stop
E. PUE lit after stop
Operation
Kept stopped
Normal display
Fault removal
OFF
ON
Motor coasting
Time
Display
ON
Fault removal
ON OFF
Decelerates
to stop
Time
Display
Refer to page 97
Communication operation and setting
Indication Fault Output
E. PUE lit Provided
Provided after stop
Not provided
Indication Fault Output
E. PUE Kept provided
Not provided
Pr. 502 setting "1"
Fault occurrence
Communication
OFF
fault
Fault display
(E.PUE)
Fault output
OFF
(ALM)
Refer to page 120
Fault removal
OFF
ON
Decelerates to stop
Time
Display
ON
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