5-121
J02 PID Control (Remote command SV)
J02 sets the source that specifies the command value (SV) under PID control.
Data for J02 Function
0
Keypad
Specify the PID command by using the
/ keys on the keypad.
1
PID command 1 (Analog input: Terminals [12], [C1] and [V2])
Voltage input to the terminal [12] (0 to ±10 VDC, 100% PID command/ ±10 VDC)
Current input to the terminal [C1] (4 to 20 mA DC, 100% PID command/ 20 mA DC
Voltage input to the terminal [V2] (0 to ±10 VDC, 100% PID command/ ±10 VDC)
3
Terminal command
UP/DOWN
Using the
UP or DOWN command in conjunction with PID display coefficients (specified by E40
and E41) with which the command value is transformed to virtual physical value etc., you can
specify 0 to 100% of the PID command (± 100% for PID dancer control).
4
Command via communications link
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.
[ 1 ] PID command with the
/ keys on the keypad (J02 = 0, factory default)
Using the
/ keys on the keypad in conjunction with PID display coefficients (specified by E40 and E41), you
can specify 0 to 100% of the PID command (±100% for PID dancer control) in an easy-to-understand converted
command format. For details of operation, refer to FRENIC-MEGA User's Manual, Chapter 7, Section 7.3.3 "Setting up
frequency and PID commands."
[ 2 ] PID command by analog inputs (J02 = 1)
When any analog input (voltage input to terminals [12] and [V2], or current input to terminal [C1]) for PID command 1
(J02 = 1) 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 J02 setting, it is necessary
to select PID command 1 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
Bias Gain
Input
terminal
Input range
Bias
Base
point
Gain
Base
point
Polarity
Filter time
constant
Offset
[12] 0 to +10 V, -10 to +10V C32 C34 C35 C33 C31
[C1] 4 to 20 mA C37 C39 - C38 C36
[V2] 0 to +10 V, -10 to +10 V
C51 C52
C42 C44 C45 C43 C41
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 mechanical 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 and C45 Terminal input specifications
0 -10 to +10 V
1 0 to +10 V (negative value of voltage is regarded as 0 V)
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