GMC-I Messtechnik GmbH
R2500–26
Temporary Setpoint Increase (boosting)
Temporarily increasing the setpoint in the hot-runner control mode can be used to free clogged mold nozzles of “frozen” material remnants.
This procedure is triggered by bit 3 of the controller function, which is set via the interface, keyboard or the binary input. The binary input must be con-
figured as follows to this end:
In1
=
booS
. If the binary input is not used to this end, setpoint increase is activated or stopped by simultaneosly pressing
and holding the keys
. Boosting is ended by clearing this bit, or is stopped automatically after maximum boosting time has elapsed.
The relative increase is saved to the
setpoint increase
parameter, and the maximum duration of the increase is saved to the
boost time
parameter.
The increase effects the setpoint or setpoint 2 only, and has no influence on the start-up setpoint or the ramp function. The setpoint value, and not the
increase, is indicated with a
b
in the left digit.
Feed-Forward Control
When configured as a discontinuous or continuous-action controller (not as a step-action controller) control quality can be significantly improved by
means of feed-forward control where abrupt load fluctuations prevail, if the binary input is configured for feed-forward control (
In 1
=
FEFO
).
– When the contact at the binary input is closed, the controller’s manipulating factor is increased by an amount of
Y FF
,
– and is reduced by the same value when the contact is opened.
– No function during self-tuning.
Example: If a machine requires an average of 70% heating power during production operation, but only 10% during idle time, the difference of
Y FF
is
set to 60%, and the binary input is only activated during production.
Summary of Contents for R2500
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