Fuji Electric FRENIC-HVAC User Manual page 403

• When process control is performed by the PID processor integrated in the inverter:
The terminal command Hz/PID ("Cancel PID control") can switch PID control between
enabled (process is to be controlled by the PID processor) and disabled (process is to be
controlled by the manual frequency setting). In either case, the combination of the "PID
control" (J101, J201) or "Selection of normal/inverse operation for frequency command 1"
(C53) and the terminal command IVS determines the final operation as listed below.
When PID control is enabled:
The normal/inverse operation selection for the PID processor output (reference frequency) is
as follows.
PID control (Mode selection)
(J101, J201)
1: Enable (normal operation)
2: Enable (inverse operation)
When PID control is disabled:
The normal/inverse operation selection for the manual reference frequency is as follows.
Selection of normal/inverse operation
for frequency command 1 (C53)
0: Normal operation
1: Inverse operation
When process control is performed by the PID control facility integrated in the
inverter, the IVS is used to switch the PID processor output (reference frequency)
between normal and inverse, and has no effect on any normal/inverse operation
selection of the manual frequency setting.
 Refer to the descriptions of J101 through J138 and J201 through J231.
Interlock -- IL (Function code data = 22)

In a configuration where a magnetic contactor (MC) is installed in the power output
(secondary) circuit of the inverter, the momentary power failure detection feature provided
inside the inverter may not be able to accurately detect a momentary power failure by itself.
Using a digital signal input with the interlock command IL assures the accurate detection.
 Refer to F14.
Terminal command IL
OFF
ON
Enable communications link via RS-485 or fieldbus (option)

-- LE (Function code data = 24)
Turning this terminal command ON gives priorities to frequency commands or run
commands received via the RS-485 communications link (H30) or the fieldbus option (y98).
No LE assignment is functionally equivalent to the LE being ON.
 Refer to H30 (Communications link function) and y98 (Bus link function).
IVS
OFF
ON
OFF
ON
IVS
–
–
Meaning
No momentary power failure has occurred.
A momentary power failure has occurred.
(Restart after a momentary power failure enabled)
6-93
6.3 Details of Function Codes
Final operation
Normal
Inverse
Inverse
Normal
Final operation
Normal
Inverse