Fuji Electric FRENIC-HVAC User Manual page 531

[ 4 ] External PID command by analog inputs (J502/J602/J652, data = 51)
When any analog input (voltage input to terminals [12] and [V2], or current input to terminal
[C1]) for an external PID command is used, it is possible to arbitrary specify the PID
command by multiplying the gain and adding the bias. The polarity can be selected and the
filter time constant and offset can be adjusted. In addition to J502, J602 and J652 settings, it is
necessary to select external PID command 1, 2 or 3 for analog input (specified by any of E61
to E63, function code data = 3). For details, refer to the descriptions of E61 to E63.
Adjustable elements of PID command
Input
Input range
terminal
Bias
0 to +10 V,
[12] C55
-10 to +10 V
4 to 20 mA,
[C1] C61
0 to 20 mA
0 to +10 V,
[V2] C67
-10 to +10 V
Offset (C31, C36, C41)

C31, C36 or C41 configures an offset for an analog voltage/current input. The offset also
applies to signals sent from the external equipment.
Filter time constant (C33, C38, C43)

C33, C38, and C43 provide the filter time constants for the voltage and current of the analog
input. Choose appropriate values for the time constants considering the response speed of the
machinery system, as large time constants slow down the response. If the input voltage
fluctuates because of noise, specify large time constants.
Polarity (C35, C45)

C35 and C45 specify the input range for analog input voltage.
Data for C35/C45
0 -10 to +10V
1 0 to +10V (negative value of voltage is regarded as 0 V)
Terminal [C1] input range selection (C40)

C40 specifies the input range for terminal [C1] (analog input current).
Data for C40
0 4 to 20 mA (factory default)
1 0 to 20 mA
Gain
Bias
Base
Base
Gain
point
point
C56 C32 C34
C62 C37 C39
C68 C42 C44
Terminal input specifications
Terminal input range
6-221
6.3 Details of Function Codes
Filter time
Polarity Offset
constant
C35 C33 C31
- C38 C36
C45 C43 C41
Input
range
-
C40
-