Signal Loss Detection (Pr.122, Pr.336 Rs-485 Communication Check Time Interval) - Mitsubishi Electric FR-F800 Instruction Manual

Signal loss detection (Pr.122, 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 (PU connector communication: E.PUE, RS-485 terminal communication: 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", communication from the PU connector is not possible. In the case of communication by RS-485
terminals, 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
interval. (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 (PU
operation mode for PU connector communication in the initial setting or Network operation mode for RS-485 terminal
communication).
Example: PU connector communication, Pr. 122 = "0.1 to 999.8s"
Operation Mode
Computer
Inverter
Inverter Computer
Communication
check counter
ALM
page 454) from the computer within the communication check time
External
PU
Pr.122
OFF
(N) Operation via communication and its settings
Check start
Fault (E.PUE)
Time
ON
457
PARAMETERS
5
GROUP
N