MITSUBISHI ELECTRIC FR-S520E - Manual (Page 153)

143
Communication parameters
2
F
UNCT
IO
NS
7) Open cable detection (Communication parameter n6 "communication check
time interval")
· If disconnection (communication stop) is detected between the inverter and
computer as a result of disconnection check, a communication error (OPT)
occurs and the inverter output is shut off.
· Disconnection check is made when the setting is any of "0.1s" to "999s". To make
disconnection check, it is necessary to send data (control code refer to page
141) from the computer within the communication check time interval. (The send
data has nothing to do with the station number)
· Communication check is performed in computer link operation mode from at the
first communication.
· When the setting is "---", communication check (disconnection detection) is not
made.
· When the setting is "0", RS-485 communication is disabled.
Computer
Operation Mode
Example: When communication parameter n6= "0.1 to 999"
External Computer link
Check start
Alarm(E.OPT)
Time
Inverter
Inverter
Computer
n6
ENQ
Communication
check counter