Fuji Electric FRENIC-HVAC User Manual page 497

[ 3 ] PID command with UP/DOWN control (J102, J202 = 3)
When the UP/DOWN control is selected as a PID command, turning the terminal command
UP or DOWN ON causes the PID command to change within the range from minimum scale
to maximum scale.
This can be set using a physical unit by means of display unit (J105) and scale (J106, J107).
To select the UP/DOWN control as a PID command, the UP and DOWN should be assigned
to the digital input terminals [X1] to [X7]. ( E01 to E07, data = 17, 18)
UP DOWN
Data = 17 Data = 18
OFF OFF
ON OFF
OFF ON
ON ON
Setting commands via the UP/DOWN control is the same as for external PID
controls 1, 2 and 3 (J501, J601 and J651).
[ 4 ] PID command via communications link (J102, J202 = 4)
Use function code S13 that specifies the communications-linked PID command. The
transmission data of 20000 (decimal) is equal to 100% (maximum frequency) of the PID
command. For details of the communications format, refer to the RS-485 Communication
User's Manual.
Selecting Feedback Terminals
For feedback control, determine the connection terminal according to the type of the sensor
output.
• If the sensor is a current output type, use the current input terminal [C1] of the inverter.
• If the sensor is a voltage output type, use the voltage input terminal [12] of the inverter, or
switch over the terminal [V2] to the voltage input terminal and use it.
 For details, refer to the descriptions of E61 through E63.
Application example: Process control (for air conditioners, fans and pumps)
The operating range for PID process control is internally controlled as 0% through 100%. For
the given feedback input, determine the operating range to be controlled by means of gain
adjustment.
(Example) When the output level of the external sensor is within the range of 1 to 5 V:
• Use terminal [12] designed for voltage input.
• Set the gain (C32 for analog input adjustment) at 200% in order to make the maximum
value (5 V) of the external sensor's output correspond to 100%. Note that the input
specification for terminal [12] is 0 to 10 V corresponding to 0 to 100%; thus, a gain factor
of 200% (= 10 V ÷ 5 V × 100) should be specified.
Function
Retain PID command value.
Increase PID command value at a rate between 0.1%/0.1 s
and 1%/0.1 s.
Decrease PID command value at a rate between 0.1%/0.1 s
and 1%/0.1 s.
Retain PID command value.
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6.3 Details of Function Codes