External Control - Digital Input; Pump Orientation; Pump Dry Priming - White Knight PPMC300 Owner's Manual

5.2.3 External Control - Digital Input

With the Plug-n-Play disabled, the pump requires external control signals. In digital input control method, the user
has the most flexibility in operating the pump. The user specifies a faster and slower cycle rate by directly
controlling the timing of the valves. There are two digital inputs that connect to the internal air valves. One is tied
to the pistons' up stroke and the other is tied to the down stroke. The pump works by oscillating the up stroke and
the down stroke signals opposite of each other. The digital signals work with NPN or Sink type digital connections.
An example digital control signal is shown below:
Note: The CPT-1 is a pump controller offered by White Knight and is capable of operating the PPMC300 in digital
control mode.

5.3 Pump Orientation

This pump uses spring loaded checks which enables the pump to
be oriented in any direction. This provides design flexibility allowing
it to be mounted anywhere. While the pump can be mounted in any
direction and function, there is still a preferred mounting
orientation. This pump prefers to be mounted such that the flow
path travels up hill; this allows for air bubbles that might travel in
the line to have a free path to exit the pump and be more
repeatable.

5.4 Pump Dry Priming

Flow Direction
Because of the small size of this pump, it has a limited dry prime
capability of approximately 20". Dry prime functions optimally
between 200-400 CPM, and with 80 PSI air pressure. Once the
pump is primed then much higher suction lift is available.
For applications that require higher suction lift a DI water purge can be used to prime the pump. To perform a DI
water purge, connect a pressurized DI line to the pump inlet, let the water run till you see fluid coming out the
outlet, then switch back to the source tank. This can be done by placing a 3-way valve on the inlet line; then the
user could switch between the DI water and the supply tank.
Manual Version 1.0.7 11
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Copyright © 2022 White Knight Fluid Handling | A Graco company