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Special operation and frequency control
NOTE
If the multi-speed (RH, RM, RL, REX signal) or Jog operation (JOG signal) is entered with the X14 signal ON, PID
control is stopped and multi-speed or Jog operation is started.
If the setting is as follows, PID control becomes invalid.
Pr. 79 Operation mode selection ="6" (Switchover mode)
The inverter is at a stop with Pr. 261 Power failure stop selection selected.
Changing the terminal function using any of Pr. 178 to Pr. 182, Pr. 190 and Pr. 192 may affect the other functions.
Set parameters after confirming the function of each terminal.
When PID control is selected, the minimum frequency is the frequency set in Pr. 902 and the maximum frequency is
the frequency set in Pr. 903.
(Pr. 1 Maximum frequency and Pr. 2 Minimum frequency settings are also valid.)
The remote operation function is invalid during PID operation.
When the control is switched to PID control during normal
operation, the frequency command value calculated by PID
operation using 0Hz as standard is used without the
frequency during the operation.
(11) Bias and gain calibration for PID displayed values (C42(Pr. 934) to C45(Pr. 935))
When both of C42(Pr. 934) and C44(Pr. 935) "9999", bias/gain calibration is available for analog value of set
point, measured value, deviation value to perform PID control.
"Bias" / "gain" function can adjust the relation between PID displayed coefficient and measured value input
signal. Examples of measured value input signals are 0 to 5VDC, 0 to 10VDC, or 4 to 20mADC, and they are
externally input.
Set PID display bias coefficient for terminal 4 input with C42(Pr.934).
(Initial value is the coefficient for 4mA.)
Set PID display gain coefficient for 20mA of the frequency command current (4 to 20mA) with C44(Pr. 935).
When both of C42(Pr. 934) and C44(Pr. 935)
934) is treated as 0%, and C44(Pr. 935) as 100%.
Three methods of bias/gain adjustment for PID displayed values are the following.
(a)Method to adjust any point by application of voltage (current) across the terminals 4 and 5.
(b)Method to adjust any point without application of voltage (current) across terminals 4 and 5.
(c)Method to adjust only the frequency without adjusting the voltage (current).
(For the detail of (a) to (c), refer to page 188.
Make adjustment by assuming C7 (Pr. 905) as C45 (Pr. 935), and Pr. 126 as C44 (Pr. 935).)
NOTE
When the voltage/current input specifications are changed with voltage/current input switch and using Pr. 73 and Pr.
267, be sure to make calibration.
260
100
Bias
C42(Pr.934)
0
20
0
4
Frequency setting signal
C43(Pr.934)
Frequency
command
PID action
Normal
operation
Operation when control is switched to PID control
"9999" and Pr. 133 is set as the set point, the setting of C42(Pr.
Initial value
100%
20mA
C45(Pr.935)
PID set point
Frequency command
during normal operation
ON
Normal
PID operation
operation
during normal operation
Gain
C44(Pr.935)
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