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Rexroth Frequency Converter EFC x610
Series
PID Regulation Mode Setting
Parameter [E4.30] 'PID deadband' is used to set the limit of the deviation be-
tween reference and feedback value. When the difference is within the defined
'PID deadband', PID control stops to bring a stable output.
When the PID output reaches [E0.09] 'Output frequency high limit' or
[E0.10]'Output frequency low limit' in PID control, following modes that is de-
fined by Parameter [E4.31] 'PID regulation mode' are available for PID regula-
tion:
[E4.31] = 0: Stop integral regulation when frequency arrives at upper / lower
limit
When the difference between the reference values and the feedback values
changes, the integral value follows immediately the difference. When the setting
frequency reaches the limits, the integration stops, and the integral value re-
mains unchanged. This mode is used in applications with fast change reference
values.
[E4.31] = 1: Continue integral regulation when frequency arrives at upper / low-
er limit
When the PID output reaches the limits, the integral continues up to its possible
numerical limit.
This mode is used in applications with stable reference values. When the differ-
ence between reference and feedback changes, more time is needed to elimi-
nate the impact of accumulated integral regulation before the integral value can
follow the change in the trend.
PID Feedforward Control
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
●
output.
1: PID feedforward activate. If [E4.00] ≠ 0, the given frequency is set by the
●
result 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.
Functions and Parameters
R912005854_Edition 09 Bosch Rexroth AG
281/653
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