Operating & Mounting instructions – 8 074 143.03/03 – Page 32
A071
Selection of PID function: ON/OFF VIC 00 or 01 00
The PID controller is activated and deactivated using parameter A071.
Setting Function
00 PID controller not active
01 PID controller active; with digital input to setting 23 (PID enable) switch-over to
manual control
Generally is:
T
N is right at kp = 1
kp ≠ 1 ⇒ T
N = TN x kp
TN = selected reset time (A073) at kp = 1
T
N* = effective reset time at kp = 0,5
T
N* = TN x 0,5
*) After setting the scale conversion (parameter A075) this parameters are adjusted and displayed in process
sizes.
**) If the PID controller is active, the reference value is set and displayed in percent or in process size
dependent on A075. By switch-over to manual controll (DIx ... 23 PID enable) the values are scaled and
also displayed in Hz.
This values are scaled with parameters A011...A014 (terminal O [V]) and A101...A104 (terminal OI [mA]).
The display parameters F001 and d004 are updated continuously !
A072
PID controller: Proportional gain (kp) VIC 0,2...5,0 1,0
A073
PID controller: Integral gain(Tn) VIC 0,0...3600 s 1,0
A074
PID controller: Differential gain(Tv) VIC 0,00...100,0 s 0,00
Parameters A072, A073 and A074 are used to
set the PID controller factors.
Please not that the individual factors can be set
separately, but that they have an influence on
each other. If P (kp) is changed, T
N also
changes
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