12.9.5 PID Feedforward Control
Code
Name
Setting range
Default
Min.
Attri.
E4.19 PID feed forward dynamic
limit
0.00...100.00 %
10.00
0.01
Run
E4.20 PID feed forward limit offset 0.00...100.00 %
2.00
0.01
Run
E4.33 PID feedforward settings
0: Inactive; 1: Active
0
-
Stop
PID feedforward controls the process item through amending the output fre-
quency setting with the fine tuning signal of PID output. Before using this func-
tion, users need set [E4.00] ≠ 0, and E4.33 should be set refer to the following
choice:
0: PID feedforward inactive. If [E4.00] ≠ 0, the given frequency is set by PID out-
put.
1: PID feedforward activate. If [E4.00] ≠ 0, the given frequency is set by the re-
sult of PID output plus the main frequency setting; the given frequency is set by
parameter E0.00 "First frequency setting source", and be obtained through Acc /
Dcc module.
Fig. 12-38: PID feedforward
The parameters E4.19 and E4.20 are both used for limiting the value of PID feed-
forward. E4.19 is the percentage relative to the main frequency, and E4.20 is the
percentage relative to E0.08.
So, the range of PID feedforward frequency is:
-Min{[E4.19]
╳
Main frequency + [E4.20]
╳
[E0.08], [E0.09]}…Min{[E4.19]
╳
Main fre [E4.20]
╳
[E0.08], [E0.09]}
VFC 3210
Bosch Rexroth AG
Functions and Parameters
DOK-RCON04-VFC3210****-IT01-EN-P
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