White Knight PPMC300, Руководство пользователя

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10 Manual Version 1.0.7
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Copyright © 2022 White Knight Fluid Handling | A Graco company 6 October 2022
cycle rate (which needs to be specified at the time of purchase), or from the internal potentiometer that can be
accessed from inside the electrical enclosure (see below in section 5.2.1.1.). A device that was not previously set
in Plug-n-Play operation can be modified to operate to perform in this manner, and if a pump was set in plug-n-
play, and was not hard coded, can be modified to accept external controls.
5.2.1.1 Switching Between Plug-n-Play and External Control:
To switch the operation mode of
the PPMC300, the electrical cover
will need to be removed. To
remove the cover, remove the
cap screw covers and the two cap
screws that hold the electrical
cover in place (shown in image to
the left). Once the cover has been
removed find the surface mount
potentiometer on the circuit board
(Shown in image to the right). Use
a small flathead screwdriver and rotate the potentiometer to the desired position. Rotating clockwise will decrease
the cycle rate, and rotating counter-clockwise will increase the cycle rate.
Note: there are no hard limits. After reaching minimum and maximum cycle rates the potentiometer will continue
to rotate without changing value. Full range of the cycle rate requires multiple turns to achieve.
Note: the potentiometer can be adjusted while the power is on, to assist in properly tuning the cycle rate.
However, care should be taken to not short circuit the circuitry.
Note: A revision change in 2022 inverted the rotation direction of the potentiometer to increase and decrease
cycle rate. If the desired effect is not achieved, attempt to rotate in the opposite direction.
After the potentiometer is set in either the Plug-n-Play operation, or in External Control operation the electrical
cover should be replaced being careful to not pinch any wires. Tighten the socket head screw caps until they are
snug; do not over tighten, as this could strip out the plastic housing. Replace the screw cap covers.
5.2.2 External Control - Analog Input
With the Plug-n-Play control disabled, then the pump is in external control. At this point the imbedded controller
watches its analog input and will vary its cycle rate depending on the signal received. Analog input signal is 0-5
VDC with the common ground from the power input is the reference voltage for the analog input signal. The
analog input is interpreted as follows:
•
0-1 VDC: Pump will not operate.
•
1 VDC: is the transition from on to off, and should be avoided as a signal input, as the pump may toggle
between the on and off position and will not flow.
•
1-5 VDC: Pump will operate based upon the voltage to cycle rate conversion equation below.
o
𝐶𝑦𝑐𝑙𝑒𝑅𝑎𝑡𝑒 = 100 ∗ 𝑉𝑜𝑙𝑡𝑎𝑔𝑒𝐼𝑛𝑝𝑢𝑡 − 100
o
This equation outputs a linear cycle rate output below are some example voltage to cycle rates:
▪
1.1 VDC = 10 CPM
▪
2 VDC = 100 CPM
▪
3 VDC = 200 CPM
▪
4 VDC = 300 CPM
▪
5 VDC = 400 CPM