Mitsubishi Electric FR-A820-00046 Instruction Manual page 832

(N) Operation via communication and its settings
Pr. 502 setting "0 (initial value) or 3"
Communication
OFF
fault
Fault display
(E.1)
Fault output
OFF
(ALM)
Alarm output
OFF
(LF)
Pr. 502 setting "4"
Communication
OFF
fault
Warning display
(CF)
Fault output
OFF
(ALM)
Alarm output
OFF
(LF)
Fig. 5-314: Operation selection at a communication option fault
NOTES When a communication option is used, the protective function [E.OP1 (fault data: HA1)] is acti-
vated at error occurrences on the communication line. The protective function [E.1 (fault data:
HF1)] is activated at error occurrences in the communication circuit inside the option.
Fault output indicates the Fault signal (ALM) and an alarm bit output.
When the fault output is set enabled, fault records are stored in the faults history. (A fault record is
written to the faults history at a fault output.)
When the fault output is not set enabled, fault record is overwritten to the faults history of the
faults history temporarily but not stored.
After the fault is removed, the fault indication goes back to normal indication on the monitor, and
the faults history goes back to the previous status.
If Pr. 502 ≠ "0", the normal deceleration time setting (settings like Pr. 8, Pr. 44, and Pr. 45) is applied
as the deceleration time. Normal acceleration time setting (settings like Pr. 7 and Pr. 44) is applied
as the acceleration time for restart.
When Pr. 502 = "2, 3 or 4", the inverter operates with the start command and the speed command,
which were used before the fault.
5 - 630
Fault occurrence Fault removal
ON
Motor coasting
Display
ON
Fault occurrence Fault removal
OFF
ON
Pr.779 = "9999" Pr.779 = "9999" Pr. 779 = "9999"
≠
Pr. 779 "9999"
(Runs at the frequency setting of Pr. 779)
Display
ON
Pr. 502 setting "1 or 2"
Communication
OFF
fault
Time
Fault display
(E.1)
Fault output
(ALM)
Alarm output
(LF)
Pr. 779
Time
Fault occurrence Fault removal
OFF ON
Decelerates to stop
Display
OFF
ON
OFF
Parameters
OFF
Time
I003100E