Installation
3-8
Part 1602966−05
E 2015 Nordson Corporation
Reclaim and Virgin Powder Feed Options
Bulk feed systems are optional. Most systems will use at least one HDLV
reclaim pump. Dual reclaim systems are often specified for coating wire
goods or for use with high gun counts.
Figures 3-17 and 3-18 illustrate typical connections and equipment required
for reclaim and virgin powder feed systems. Refer to your system drawings
for additional information and installation information.
Reclaim Powder Systems: The pump panel and HDLV transfer pump are
mounted on the cyclone stand. The purge valve is plumbed into an air drop
and the shuttle valve is mounted next to the purge valve. When the
operator turns on the reclaim pump, air flows from a solenoid-operated
valve through 8-mm tubing to the pump operating air regulator. 6-mm
tubing supplies regulated air to the transfer pan fluidizing air regulator and
line pressure to the manual purge pushbutton valve. This valve allows the
operator to purge the reclaim pump as needed.
During a color change cycle, the operator disconnects the reclaim transfer
hose from the sieve deck and connects it to one of the purge ports on the
side of the feed center. The operator then turns the purge switch to the
Pump Purge position. A signal from the feed center opens a solenoid valve
in the control manifold, sending pilot air to the reclaim pump purge valve.
The valve opens and allows air at line pressure to flow through the pump
and the 16-mm suction and delivery powder tubing to clean them. The
purged powder is dumped into the feed center exhaust duct to the afterfilter.
Virgin Powder Feed System: A typical bulk feed system includes a HDLV
transfer pump and pump panel as well a process valve to control system
operation. The process valve is connected directly to the main air manifold
on the feed center.
When a hopper is selected as the powder source and the lance level sensor
tells the system that the powder level is low, pilot air flows from the control
manifold through 6-mm tubing to the process valve, which opens and
supplies air at line pressure to the virgin powder system and turns on the
pump. Powder is pumped out of the bulk powder container to the feed
center hopper. The pump panel has regulators to control air pressure to the
pump and air pressure to an auxiliary function, such as a vibrator motor.
During a color change cycle, the operator disconnects the virgin transfer
hose and suction hose from the sieve deck and connects it to one of the
purge ports on the side of the feed center. The operator then turn the purge
switch to the Pump Purge position. A signal from the feed center opens a
solenoid valve in the control manifold, sending pilot air through 6-mm tubing
to the virgin pump purge valve. The valve opens and allows air at line
pressure to flow through the pump and the 16-mm suction and delivery
powder tubing to clean them. The purged powder is dumped into the feed
center exhaust duct to the afterfilter.
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