Mitsubishi Electric 800 Series Function Manual page 18

(N) Operation via communication and its settings
• The following charts show operations when a communication option is used and a fault occurs.
Pr.502 = "0 (initial value) or 3"
Fault
Output
frequency
Fault indication
(E.1)
Fault signal
(ALM)
Alarm signal
(LF)
Pr.502 = "4"
Fault
Output
frequency
Pr.779
Warning
indication (CF)
Fault signal
(ALM)
Alarm signal
(LF)
NOTE
• 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 fault bit output.
• When the fault output setting is active, fault records are stored in the fault history. (A fault record is written to the fault history
at a fault output.)
• When the fault output setting is not active, fault record is overwritten to the fault history temporarily but not stored.
After the error is removed, the fault indication is reset, changing the display back to normal, and the last fault is displayed in
the fault history.
• When Pr.502 is set to "1 to 4", the normal deceleration time setting (such as Pr.8/Pr.44/Pr.45 setting) is applied.
• When a communication line error occurs while Pr.502 = "2 or 12", the motor re-accelerates if the error is removed during
deceleration. The operation command and the speed command before the fault occurred will be applied for restarting. The
normal acceleration time setting (such as Pr.7/Pr.44 setting) is applied for restart. (Acceleration is not restarted if the error is
that of the option unit itself.)
CAUTION
 When Pr.502 = "3" and a communication line error occurs, or Pr.502 = "4" and a communication line
error or a communication option fault occurs, the operation continues. When setting "3 or 4" in
Pr.502, provide a safety stop countermeasure other than via communication. For example, input a
signal (RES, MRS, or X92) through an external terminal or press the PU stop on the operation panel.
18
PARAMETER
Fault cleared
Fault detected
OFF ON
Motor coasting
Displayed
OFF
ON
OFF
Fault detected Fault cleared
OFF ON
Pr.779 = "9999" Pr.779 = "9999" Pr.779 = "9999"
Pr.779
"9999"
(Operation continues at the frequency set in Pr.779)
Displayed
OFF
OFF ON
Pr.502 = "1, 2, 11 or 12"
OFF OFF
Fault
Output frequency
Time
Fault indication
(E.1)
Fault signal
(ALM)
Alarm signal
OFF
(LF)
OFF
Time
Fault detected Fault cleared
ON
Motor decelerates to stop
Displayed
OFF ON
OFF
Time