Siemens Milltronics SF 500 - Page 113

7ML19985CN01 Milltronics SF 500 - INSTRUCTION MANUAL Page 107
mmmmm
Parameters
P400 PID System
Enables the selected PID system, systems 1 or 2 (P400 – 01 or – 02).
Entry:
0 = OFF
f
1 = manual
2 = auto
P401 PID Update Time
Sets the update time (P401 – 01 or -02) for the corresponding PID system (1 or 2).
Normally the controller is updated each time the process value is updated (every 300 ms).
However in unstable or slow reacting systems the controller update can be programmed
to update on a multiple of the process value update. A high value can introduce instability.
(
f = 1)
Entry:
1 = 300 ms
2 = 600 ms
3 = 900 ms
etc.
P402 PID Process Value Source
Determines the source of the process value (P402 – 01 or – 02) for the corresponding PID
system (1 or 2)
The process value is the value that the controller is trying to match with the setpoint.
(
f = 1)
Enter:
1 = rate
f
2 = mA input 1
3 = mA input 2
P405 Proportional Term
Sets the proportional term (P405-01 or -02) for the corresponding PID system (1 or 2).
(
f = 0.400)
The proportional term is the proportional gain. A gain of 1 is equivalent to a proportional
band of 100%.
The proportional band is the range of deviation from the setpoint that corresponds to the
full range or the control output.
Enter the proportional term 0.000 to 2.000.