Signal Loss Detection (Pr.336 Rs-485 Communication Check Time Interval) - Mitsubishi Electric 800 Series Instruction Manual

NOTE
• The operation at a communication error occurrence depends on the Pr.502 Stop mode selection at communication
error setting. (Refer to
4.4.7

Signal loss detection (Pr.336 RS-485 communication check time interval)

• If a signal loss (communication stop) is detected between the inverter and computer as a result of a signal loss detection, a
communication fault (E.SER) occurs and the inverter trips.
• When the setting is "9999", communication check (signal loss detection) is not made.
• When the setting is "0", reading, etc. of monitors and parameters is possible, though a communication error (E.SER) occurs
instantly when the Network operation mode is switched to.
• A signal loss detection is made when the setting is any of "0.1 s to 999.8 s". To make a signal loss detection, it is necessary
to send data (for details on control codes, refer to
(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 in the operation mode having the operation source (Network
operation mode in the initial setting).
Example: Pr.336 = "0.1 to 999.8 s"
Operation Mode
Computer
Inverter
Inverter
Computer
Communication
check counter
ALM
page 27)
page
External Network
Pr.336
OFF
40) from the computer within the communication check time interval.
Check start
Fault (E.SER)
Time
ON
PARAMETER
4
45