5.4 Details of Function Codes
5-130
Assignment of PID control cancel Hz/PID (Function code data = 20)
When Hz/PID is on, switching to the manual frequency setting (driven with the frequency selected by the
multi-frequency, keypad, and analog input) is by the PID control is possible.
Table 5.4-65
Input Signal Hz/PID Selected Function
OFF Enable PID Control
ON PID control invalid (Manual frequency setting)
(
Function code J01 to J19, J56 to J62)
Assignment of normal/inverse switching IVS (Function code data = 21)
This function switches the normal/inverse operation of the output signal (frequency setting) of PID control or
frequency setting.
Fig. 5.4-50
The normal/inverse switching operation is useful for air-conditioners that require switching
between cooling and heating. The cooler increases the speed of the fan motor (output frequency
of the inverter) in order to lower the temperature. The heater decreases the speed of the fan
motor (output frequency of the inverter) in order to lower the temperature. This switching is
executed by the normal/inverse switching function.
- When the inverter is driven by an external analog frequency command (terminals
[12], [C1] and [V2]
):
Switching normal/inverse operation can apply only to the analog frequency command (terminals [12], [C1],
and [V2]) in frequency command 1 (F01) and does not affect frequency command 2 (C30) or UP/DOWN
control. The combinations of normal/inverse operation selection (frequency command 1) (C53) and normal
operation/inverse operation switching IVS signals result the operations as shown in the following table.
Table 5.4-66
Data for C53 Input signal IVS Enable
0: Normal operation OFF Normal operation
0: Normal operation ON Inverse operation
1: Inverse operation OFF Inverse operation
1: Inverse operation ON Normal operation
- When process control is executed by the PID control function integrated in the inverter
In the mode that the process is controlled by the PID control function integrated in the inverter, PID cancel
Hz/PID signal can switch between the PID control valid (operation by the PID controller) and PID control
invalid (operation by the manual frequency setting). In either case, the combination of the inverse operation
select (Frequency command 1) (C53), PID control operation selection (J01), and normal/inverse operation
switching IVS signal. The normal/inverse operation is determined as shown in the following table.
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