Mitsubishi Electric FR-A820-00046 Instruction Manual page 884

(N) Operation via communication and its settings
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.
Pr.1431 setting
0 (initial value)
1
2
3
Tab. 5-311: Pr. 1431 settings
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.
Example When Pr. 1432 = 0.1 to 999.8 s
Operation mode
Connected device
Inverter
Inverter
Connected device
Communication
check counter
E.EHR
Fig. 5-335:
5 - 682
Description
Detection disabled
Warning output
Warning and alarm output
Protective function (E.EHR)
External Network
Check starts
Pr. 1432
Timing chart for Ethernet communication check time interval
Operation panel display/
indicator
—
EHR
EHR
E.EHR
OFF
Parameters
LF signal output
No
No
Yes
Yes
Fault (E.EHR)
Time
ON
I003114A