Siemens Milltronics BW500 Operating Lnstructions page 84

Figure 2
Figure 3
5. Once the P term value is set to give the control output of the BW500 consistent
oscillation and the error is at its minimum, turn the feeder off.
6. The I term value can now be set. Begin by entering the default value of 0.2.
7. Restart the feeder (test weights or chains still applied) and feed rate setpoint
entered.
8. Again observe the oscillation of the control output. Compare results to the figures 4,5
and 6 below.
Figure 4
Page 78 Milltronics BW500 and BW500/L - OPERATING INSTRUCTIONS 7ML19985DK05
P term is too low
P term is correctly set
I term is too high
SETPOINT
SETPOINT
SETPOINT