Nova-Tech Chem-Tech XP Series - Manual (Page 8)

REV. L PN J63031 - 8-
Figure 6: Adjustable Feed-Rate Pump Control Panel (Note Fixed Speed
only has 3-Way Rocker Switch)
The cycle time is 2 seconds and the adjustment dial provides the setting
percentage as the amount of time that the pump is on in each 2 second cycle.
For example, a dial setting of 5% provides a 0.10-second on-time (0.05 X 2) and
corresponding 1.90-second off-time (2 – 0.10). Conversely a setting of 95%
provides a 1.90-second on-time (0.95*2) and corresponding 0.10-second (2 –
0.10) off-time. The graph below provides a convenient reference for all dial
settings in terms of on and off-times.
Relative On-Off Times
0
0.5
1
1.5
2
0% 20% 40% 60% 80% 100%
Dial Set Point (%)
R
el
at
ive T
im
e (
seco
n
d
s)
On-Time (seconds) Off-Time (seconds)
Note that the momentary “On” (100% switch position) by-passes the adjustable
timer setting of the pump, causing the pump to run continuously regardless of the
timer percentage setting. When released the switch returns to the “Off” position
(O).
Continuous On
Off
Momentary On
0 to 100%
Adjustable
Feed-Rate
Rocker 3-Position Switch