System Overview
2-5
Part 1618871−01
2020 Nordson Corporation
DC Power Supplies
There are up to two power supplies in a controller cabinet:
One 600 W − provides power to the dual spray gun cards, flow nodes,
and manual spray gun interface (MGI)
One 100 W (unswitched) − provides 24 Vdc power to the PLC, eWON
,
and touchscreen (main controller only)
Dual Spray Gun Cards
Each dual spray gun card in the card cage provides electrostatic controls for
two Encore automatic powder spray guns. The cards provide a 0−19 Vac
(peak) signal to drive the electrostatic power supplies inside the Encore
spray guns. The dual spray gun card also provides process feedback to the
operator interface.
Spray Gun Pump Control
The Engage controller and the manual spray gun controllers control the
powder pumps through the CAN network to the flow node. The flow node is
then hardwired out to the HD pump module.
Airflow and atomizing air for VT pumps is controlled through flow nodes.
iFlow
r
Digital Flow Modules
The controller controls air flow to the pumps supplying powder to the
automatic spray guns. The flow controls consist of precision regulators and
iFlow
digital flow modules.
One regulator supplies air to two iFlow modules. Each module supplies flow
and atomizing air to two powder pumps, plus gun air (electrode wash air) to
two spray guns. Flow and atomizing air is turned on and off when the spray
guns are triggered on and off.
For HD pumps, the iFlow module also includes HDLV valve drivers to
control the HD pumps.
The modules provide closed−loop control of the flow and atomizing air,
constantly sensing the output and adjusting it to maintain air flow at the
preset settings. The regulators provide air at a constant pressure to the
iFlow modules so the closed−loop controls can operate at the calibrated
range. The regulators are set 85−86 psi (5.86−5.93 bar) at the factory—do
not change their settings.
Maximum output per flow module is 27.18 m
3
/hr (16 scfm). Maximum
output per channel is 6.80 m
3
/hr (4 scfm).
Two solenoid valves on the iFlow modules control the flow of gun air to the
spray guns. The air flow is regulated by a fixed-orifice restrictor at the
output. The solenoids can be set to turn on and off as the guns are
triggered.
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