Mitsubishi Electric A800-E Instruction Manual page 18

• The following charts show operations when a communication option is used and a fault occurs.
Pr.502 = "0 (initial value) or 3"
OFF
Fault
Output
frequency
Fault indication
(E.1)
Fault signal
OFF
(ALM)
Alarm signal
OFF
(LF)
Pr.502 = "4"
OFF
Fault
Output
frequency
Pr.779
Warning
indication (CF)
Fault signal
OFF
(ALM)
Alarm signal
OFF
(LF)
NOTE
• When a communication option is used, the protective function [E.OP1 (fault data: HA1)] is activated 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 (ALM) signal 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.
• When Pr.502  "0", the normal deceleration time setting (settings of Pr.8, Pr.44, and Pr.45, etc.) is applied as the deceleration
time. Normal acceleration time setting (settings of Pr.7 and Pr.44, etc.) 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.
• If a communication line error occurs, then the error is removed during deceleration while Pr.502 = "2", the motor re-
accelerates from that point. (When a communication option is used, acceleration does not restart at a communication option
error.)
• The Pr.502 and Pr.779 settings are valid when communication is performed via the Ethernet connector or a communication
option.
• These parameters are valid under the Network operation mode. When performing communication via the Ethernet connector,
set Pr.551 PU mode operation command source selection  "5".
• Pr.502 is valid for the device that has the command source under the Network operation mode. If a communication option is
installed while Pr.550 = "9999 (initial value)", an Ethernet connector communication error occurs and Pr.502 becomes
invalid.
• If the communication error setting is disabled with the settings of Pr.502 = "3" and Pr.1432 = "9999", the inverter does not
continue its operation at the frequency set in Pr.779 when a communication error occurs.
• If a communication error occurs while continuous operation at the frequency set in Pr.779 is selected with Pr.502 = "3 or 4",
the inverter operates at the frequency set in Pr.779 even though the speed command source is at the external terminals.
Example) If a communication error occurs while Pr.339 = "2" and the RL signal is input through an external terminal, the
operation is continued at the frequency set in Pr.779.
• During position control, an error occurs even if "2" is set in Pr.502.
Fault cleared
Fault detected
ON OFF
Motor coasting
Time
Displayed
ON
Fault detected Fault cleared
ON OFF
Pr.779 = "9999" Pr.779 = "9999" Pr.779 = "9999"
Pr.779 "9999"
(Operation continues at the frequency set in Pr.779)
Displayed
ON
(N) Operation via communication and its settings
Pr.502 = "1 or 2"
Fault detected
OFF
Fault
Output frequency
Fault indication
(E.1)
Fault signal
OFF
(ALM)
Alarm signal
OFF
(LF)
Time
Fault cleared
ON OFF
Motor decelerates to stop
Time
Displayed
ON
PARAMETER
2
GROUP
N
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