Pressure
build‐up feature
Enabled
Setpoint for
pressure build-up
Line speed value for activating
pressure build‐up
Actual
Fig. 4‐109
M8
1
Fig. 4‐110
Motor LED
Operation
4‐78
P/N 213828_11
2014 Nordson Corporation
VersaBlue_PPA
Motor (contd.)
Parameters (Screen 5: Pressure Build‐up Feature)
This feature allows the material pressure to be regulated to an adjustable
value as soon as the line speed signal falls below an adjustable value. This
allows the melter to maintain a certain pressure even when there is a break in
production.
NOTE: The threshold switch is automatically deactivated as long as
pressure build-up is enabled.
The motors are speed‐controlled during production. If the line speed signal
falls below the value Line speed value for activating pressure build-up, the
motors are pressure-controlled to the value Setpoint for pressure build-up.
As soon as the line speed signal exceeds the value plus 5% (15% in the
example), the melter returns to speed‐controlled mode.
The appearance of the motor LED changes from a single color to two colors
as long as the condition for pressure build-up is fulfilled (Refer to illustration).
Characteristics
The pressure sensors A are always responsible for pressure control
during pressure build-up.
When pumps are in the process of building up pressure, there is no
pressure alarm monitoring (sensors A and B).
There is no pressure alarm monitoring for pressure sensors C as soon as
at least one pump is building up pressure.
The output Motor running on the interface Standard I/O is switched off as
long as the corresponding pump is in the process of building up pressure.
When pressure build-up has been completed for all pumps for which this
feature has been selected, meaning that the pressure setpoint has been
reached, an indication appears in the status line on the control panel and
a signal is switched via the interface Standard I/O or the field bus.
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