Operating & Mounting instructions – 8 074 143.03/03 – Page 88
Reference value: Actual value:
Remark:
In order to ensure a correct control process within the whole PID range, the feedback value
must be able to exceed the reference value.
(A deviation is absolutely necessary in order to achieve a control action !)
To adjust the acutal value input (0...500 l/h) to the reference value input (0...300 l/h), it is necessary
to synchronize the actual value at the current input with parameter A101...A104.
Therefore, parameter A102 must be set to 500 l/h (166,6 %), so that an actual value of 300 l/h
corresponds with an reference value of 100 %.
Parameter adjustments:
A001 = 01 Reference value via control terminals
A002 = 01 Control command via digital input
A071 = 01 PID controller active
A075 = 3,0 Scale conversion
A072 = 1,0 P - gain
A073 = 1,0 s I - gain
A074 = 0,0 s D - gain
A011 = 0 l/h Adaptation of the analog ref. value
A012 = 300 l/h
A013 = 0 %
A014 = 100 %
A101 = 0 l/h Adaptation of the analog actual value
A102 = 500 l/h
A103 = 0 %
A104 = 100 %
F002 = appr. 3 s Adjust acceleration time
F003 = appr. 5 s Adjust deceleration time
C001 = 18 RS Reset on digital input 1
C021 = 04 PID deviation signal on terminal 11
C044 = 20 % maximum controller deviation as warning signal 20 %
A062 = 10 Hz Minimum frequency
After setting parameter A062 to 10 Hz, the frequency inverters displays the alarm message
W025. The PRG-LED starts flashing until the inverter is started. The alarm means, that the ref.
value is lower than the minimum frequency.
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General