7ML19985CN01
Milltronics SF 500 - INSTRUCTION MANUAL
Page 63
mmm
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PI
D Co
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A properly set D term makes the initial oscillations around the setpoint smaller, as in
figure 6. A D term set too high induces high oscillations, as in figure 4. Omission of the D
term, or set too low, shows no effect on the system.
10. The above closed loop cycling procedure allows ease in start up, but final
adjustments may be necessary in actual process operation.
Programming
The SF 500 must be programmed to take advantage of the PID algorithms.
The SF 500 offers programming for two separate PID controls, 1 and 2. The controller
being programmed is identified by the index to the parameter number. E.g. P400-01
indicates that PID for control system 1 is accessed.
.
Access
Off disables the PID parameter set, P401 to P418. They are not accessible.
Manual: the control output is the manual output P410.
Auto: engages the PID controller function. This can also be done using the
key.
Note:
All programming should be done in the PID manual mode.
P400-01 PID System
E
Select: 0-Off, 1-Manual, 2-Auto
0
Note:
For the mA output:
•
mA output 2 (P201-02) is normally reserved for controller 1. The signal is
output at terminals 1 and 2 on the mA I/O board.
•
mA output 3 (P201-03) is normally reserved for controller 2. The signal is
output at terminals 3 and 4 on the mA I/O board.
P201-02 mA Output Function
E
Select: 1-Rate, 2-PID
1
Note:
For the mA input:
•
mA input 1 is an external signal normally reserved for controller 1. The
signal is input at terminals 5 and 6 on the mA I/O board.
•
mA input 2 is an external signal normally reserved for controller 2. The
signal is input at terminals 7 and 8 on the mA I/O board.
Select the PID function.
To program PID parameters,
select 1-Manual.
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