Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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(N) Operation via communication and its settings Parameters
5 - 682
Ethernet signal loss detection (Pr. 1431)
Use Pr. 1431 to set the operation when Ethernet communication is interrupted by physical factors in-
cluding disconnection of the Ethernet board or Ethernet cable or damages on the Ethernet cable.
Ethernet communication check time interval (Pr. 1432)
●
If a signal loss (communication stop) is detected between the inverter and all the devices with IP
addresses in the range for Ethernet command source selection (Pr. 1449 to Pr. 1454) as a result of
a signal loss detection, a communication error (E.EHR) occurs and the inverter trips.
●
When "9999 (initial value)" is set in Pr. 1432, the communication check (signal loss detection) will
not be performed.
●
The monitored items and parameter settings can be read via Ethernet when "0" is set in Pr. 1432,
but a communication error (E.EHR) occurs instantly when the operation mode is switched to the
Network operation.
●
A signal loss detection is made when any of 0.1 s to 999.8 s is set in Pr. 1432. In order to enable the
signal loss detection, data must be sent by connected devices at an interval equal to or less than
the time set for the communication check. (The inverter makes a communication check (clearing
of communication check counter) regardless of the station number setting of the data sent from
the master.)
●
Communication check is started at the first communication when the inverter operates in the
Network operation mode and the command source is specified as communication via the Ether-
net connector.
Pr.1431 setting Description
Operation panel display/
indicator
LF signal output
0 (initial value) Detection disabled — No
1 Warning output EHR No
2 Warning and alarm output EHR Yes
3 Protective function (E.EHR) E.EHR Yes
Tab. 5-311: Pr. 1431 settings
Example When Pr. 1432 = 0.1 to 999.8 s
I003114A
Fig. 5-335: Timing chart for Ethernet communication check time interval
E.EHR
External Operation mode
Fault (E.EHR)
Network
OFF ON
Communication
check counter
Connected device
Time
Inverter
Inverter
Connected device
Pr. 1432
Check starts