HBM WTX110 - Page 143

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WTX110 A4774-1.0 HBM: public 141
10.2.11.2 Coarse and fine 2 (Coarse+Fine2)
Before the start of the coarse flow phase the fine flow is first activated for a
short time. Then Coarse+Fine flow is activated for the coarse flow phase.
When the coarse flow limit switch (CBK) is reached the coarse flow is
deactivated. If opening occurs in the fine flow phase, such as during re-dosing
(parameter P1 > 0), or when starting from a stop, only the fine flow is activated.
This priority fine flow serves to minimize foaming of the fill material.
Coarse flow
Fine flow Start
Start
Time
Time
OFF
OFF
ON
ON
Coarse flow cut-
off point
Fine flow cut-
off point
Fig. 10.5 Filling cycle with valve control Coarse+Fine2
Coarse flow
Fine flow
Start
Time
Time
Off
Off
On
On
Fine flow cut-
off point
Coarse flow cut-
off point
First fine flow phase
before coarse flow
Fig. 10.6 Fill cycle with valve control 'Coarse/Fine2' with first fine flow phase activated
(see also section 10.2.26)