How To Switch Communications Enabled/Disabled - Fuji Electric FRENIC-AQUA series User Manual

2.3.3

How to switch communications enabled/disabled

To issue a frequency setting or operation command through communications to control the
inverter, select "Through RS-485 communications" by function code H30: link function
(operation selection).
In addition, when switching control through communications with control from the terminal block
(frequency setting from terminal [12], operation command from terminal [FWD] and so on) to
switch remote operations with operations on the inverter body, assign "link operation selection"
(data = 24: "LE") to the function code related to the digital input terminal (one of E01-E05:
terminals [X1] to [X5], E98: terminal [FWD], or E99: terminal [REV]). Control can be switched by
the terminal to which "link operation selection" (data = 24: "LE") is assigned.
Communications automatically becomes valid when link operation selection is not assigned to
any digital input terminal.
Table 2.5 Digital input terminal settings and communications statuses
- Via-communications command data and operation data must be rewritten from the
host (controller) because the memory is initialized when the power is turned ON.
- Although command data and operation data can be written even if communications
is invalid, they will not be validated because the switch is made invalid by link
operation selection. If communications is made valid with no operation data written
(operation command OFF, frequency setting = 0 Hz) during operation, the running
motor decelerates to a stop and may exert impact on the load depending on the set
deceleration time. Operation can be switched without causing impact to the load by
setting data in communications invalid mode in advance and then switching the
mode to valid.
- If negative logic is set as Link enable (data 1024), the logical value corresponding to
the ON/OFF status of the command "LE" will be reversed.
- The field bus option is handled prior to RS-485 communication depending on the
setting of the option in some cases. For details, see the function code y98 "Bus link
function (Mode selection)."
Input terminal
OFF
ON (short-circuited to
the terminal [CM])
Status
Communications invalid
Communications valid
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