User guide

TrueFeed manual
48
2.4 Electrical installation
Solenoid valve
The solenoid valve needs to be connected to the control of the TrueFeed.
The wiring diagram for this connection is located in Appendix B.
3. Operation
3.1 How it works
The ejector pipe is located near the material supply and creates a vacuum on its inlet
by compressed air. This vacuum pulls on the material source and begins a flow of material
through the ejector pipe. Once inside the ejector pipe, the material is then ‘pushed’ by
the compressed air through the flex hose, towards the hopper of the dosing TrueFeed.
Once inside the hopper, the compressed conveying air is separated from the conveyed
material by a combination of gravity and the filter located on top of the loader. The
filter is a stainless steel perforated plate with ø0.07 inch {ø2mm} holes, plus an additional filter cloth.
3.2 Setting filling time and filling alarm
For the TrueFeed unit, the filling time and filling alarm need to be set. See section 7.10.
Filling time
Function:
When it is detected that the hopper is running empty the filling system/solenoid valve is switched
on. The filling time determines the duration of filling after the empty level is crossed again by filling
of material. This means that if the filling time is set to zero the loading system will only switch on
when the actual material level is under the empty level. When the filling time is set to 15
seconds the loading system will continue to convey material for 15 seconds after the empty level
is crossed.
Setting:
The filling time setting depends on several parameters. It is advised to start with 30 seconds and
adjust the time if necessary.
Filling alarm
Function:
The function of the filling alarm is to warn the operator that the hopper is not being filled even when
the hopper loader system is switched on. An empty material drum or loss of air pressure are
possible causes of a filling alarm.
Setting:
The filling alarm should be set longer then the filling time.