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Alarm (LF) signal output (communication error warning)
• During a communication error, the Alarm (LF) signal is output by open collector output. Assign the terminal to be used using
any parameter from Pr.190 to Pr.195 (Output terminal function selection).
Master
Alarm data
Slave
Communication
0
error count
(Pr.343)
OFF
Signal LF
Communication error count is
increased in synchronization with
leading edge of LF signal
NOTE
• The LF signal can be assigned to an output terminal by setting Pr.190 to Pr.195. Changing the terminal assignment may affect
other functions. Set parameters after confirming the function of each terminal.
Signal loss detection (Pr.539 MODBUS RTU communication check time
interval)
• If a signal loss (communication) is detected between the converter unit and the master as a result of a signal loss detection,
the Communication fault (inverter) (E.SER) occurs and the inverter output is shut off.
• When the setting is "9999", communication check (signal loss detection) is not made.
• When the setting is "0", the monitor items and parameter settings can be read, but a communication error (E.SER) occurs.
• A signal loss detection is made when the setting is any of "0.1 s to 999.8 s". In order to enable the signal loss detection,
data must be sent by the master 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).
Alarm data
Alarm data
Not increased
1
ON
Turns off when normal data is received
Alarm data
Alarm data
Reply data
OFF
Alarm data : Data resulting in communication error.
5.7 (N) Communication operation parameters
Reply data
2
OFF
ON
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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