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VFC 3210
12.9.5 PID Feedforward Control
Code
Name
PID feed forward dynamic
E4.19
limit
E4.20 PID feed forward limit offset
E4.33 PID feedforward settings
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 frequency + [E4.20] ╳ [E0.08], [E0.09]}
DOK-RCON04-VFC3210****-IT01-EN-P
Setting range
0.00...100.00 %
0.00...100.00 %
0: Inactive; 1: Active
Bosch Rexroth AG
Functions and Parameters
Default
Min.
10.00
0.01
2.00
0.01
0
-
Attri.
Run
Run
Stop
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