Fuji Electric FRENIC-Ace series, User Manual

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5.3 Description of Function Codes
5-107
FU
NCT
IO
N
C
O
DE
S
Chap 5
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Cancel PID control – “Hz/PID” (Function code data = 20)
Turning this terminal command “Hz/PID” ON disables PID control. If the PID control is disabled with this command,
the inverter runs the motor with the reference frequency manually set by any of the multistep frequency, keypad,
analog input, etc.
Terminal command “Hz/PID” Function
OFF Enable PID control
ON Disable PID control (Enable manual settings)
(

Function codes J01 to J19, J57 to J62)
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Switch normal/inverse operation – “IVS” (Function code data = 21)
This terminal command switches the output frequency control between normal (proportional to the input value) and
inverse in analog frequency setting or under PID process control. To select the inverse operation, turn the IVS ON.
The normal/inverse switching operation is useful for air-conditioners that require switching between
cooling and heating. In cooling, the speed of the fan motor (output frequency of the inverter) is increased
to lower the temperature. In heating, the speed of the fan motor (output frequency of the inverter) is
reduced to lower the temperature. This switching is realized by the IVS.
• When the inverter is driven by an external analog frequency setting sources (terminals [12] and [C1] (C1
function) and [C1] (V2 function)):
Switching normal/inverse operation can apply only to the analog frequency command sources (terminals [12] and
[C1] (C1 function) and [C1] (V2 function)) in frequency setting 1 (F01) and does not affect frequency setting 2 (C30)
or UP/DOWN control. As shown below, the combination of the “Selection of normal/inverse operation for frequency
setting 1” (C53) and the terminal command “IVS” determines the final operation.
C53 data Terminal command “IVS” Action
0: Normal operation OFF Normal
0: Normal operation ON Inverse
1: Inverse operation OFF Inverse
1: Inverse operation ON Normal
Output frequency
Inverse operation
Normal
operation
Analog input voltage
Analog input current