Operation
5-3
Part 1602966−05
E 2015 Nordson Corporation
Feed Center Operation
Refer to Figure 5-1 for the feed center operator controls, and Section 4,
Setup, for the PLC function settings.
Sieve Operation
See Figure 5-1. Powder is supplied to the feed center by HDLV reclaim and
virgin powder transfer pumps. The powder is screened before flowing into
the feed hopper. The sieve is turned on and off with the Sieve Control
switch (4).
When the sieve is turned off, the reclaim and virgin powder transfer pumps
are disabled.
Reclaim and Virgin Pump Selector Switch Operation
See Figure 5-1. The operation of the Reclaim and Virgin powder transfer
pumps are controlled by separate selector switches (2, 3). Turning the
switches to ON ( I ) enables the transfer pumps.
If the reclaim or virgin transfer pump selector switches are in the ON
position when the feed center is turned on, or after a color change cycle is
completed, then the pumps will be forced off. To re-enable the pumps,
toggle the selector switches off then on.
The virgin transfer pump is disabled when the sieve is turned off.
Reclaim Transfer Pump Operation
The reclaim pump operates continuously as long as it is turned on.
Virgin Transfer Pump Operation
The virgin transfer pump operation is controlled by a level sensor on the
lance. If the powder level in the feed hopper falls below the level sensor, a
delay timer (Screen 2, Virgin Powder Transfer Delay) is started. When the
delay timer runs out, the virgin powder transfer pump is started. The pump
runs until the powder in the feed hopper reaches the level sensor, then turns
off.
If the level sensor detects a low level of powder for too long (Low Powder
Alarm Delay, Screen 3), a buzzer is turned on to warn the operator that the
feed hopper powder supply has not been replenished.
The buzzer can be silenced by:
S filling the feed hopper until the powder contacts the level sensor.
S momentarily turning on gun purge.
S turning the virgin transfer pump off.
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