Mitsubishi FR - S500 Instruction Manual page 114

(4) I/O signals
Signal Terminal Used
Depending on
X14
Pr. 60 to Pr. 63
Input 2
4
FUP
FDN
Depending on
Output
Pr. 64, Pr. 65
RL
Enter the set point across inverter terminals 2-5 or in Pr. 93 and enter the process
value signal across inverter terminals 4-5.
To exercise PID control, turn on the X14 signal. When this signal is off, PID control is
not exercised.
Item Entry
Across
Set point terminals 2-5
Pr. 93
Process Across
value terminals 4-5
(5) Parameter setting
Parameter
Name
Number
PID action
88
selection
PID
89 proportional
band
Function
PID control
selection
2 Set point input
Process value
4
input
Upper limit output
Lower limit output
Forward (reverse)
rotation direction
output
Set 0V as 0% and 5V as 100%.
Set 0V as 0% and 10V as 100%.
Set the set point (%) in Pr. 93.
4mA DC is equivalent to 0% and 20mA DC to 100%.
Setting
20 For heating, pressure control, etc. PID reverse action
21 For cooling, etc.
If the proportional band is narrow (parameter setting is
small), the manipulated variable varies greatly with a
slight change of the process value. Hence, as the
0.1 to 999% proportional band narrows, the response sensitivity
(gain) improves but the stability deteriorates, e.g.
hunting occurs.
Gain K = 1/proportional band
- - - No proportional control
Turn on X14 to exercise PID control.
Enter the set point for PID control.
Enter the 4 to 20mADC process value
signal from the detector.
Output to indicate that the process value
signal exceeded the upper limit value.
Output to indicate that the process value
signal exceeded the lower limit value.
"Hi" is output to indicate that the output
indication of the parameter unit is forward
rotation (FWD) or "Low" to indicate that it is
reverse rotation (REV) or stop (STOP).
Description
When "0" is set in Pr. 73 (5V
selected for terminal 2).
When "1" is set in Pr. 73 (10V
selected for terminal 2).
Description
105
Description
PID forward action
2