ENCORE
®
700 METERING PUMP
Intermittent Start-Stop Operation (Refer to Dwg. 440.400.130.010 In Section 2)
Intermittent start-stop operation, also called semi-automatic operation,
is simply the starting and stopping of the treatment (pump) in synchro-
nism with an intermittent flow. This is accomplished by interrupting the
electric current to stop the pump. The usual example calls for treating
the discharge from a pumping system that starts and stops in response
to predetermined variations in elevation or pressure of the liquid being
treated.
Adjustment of Feed Rate
The feed rate of the pump is governed by the frequency of the pump
stroke, the length of the pump stroke, and the strength of the solution
to be fed.
Frequency of the Pump Stroke
Thefrequencyofthepumpstrokeisdeterminedbythegearratioof the speed
reducer. Available speeds for the Encore 700 are listed in Table 3.1:
Table 3.1 - Pump Gear Ratios and Speeds
Available
Number of Strokes
24:1
72 spm
If the pump is a pulley drive arrangement, each stroking speed can be
further turned down. Refer to Table 1.3 (in Section 1) for further details
on stroking speeds. If the pump is equipped with a variable speed drive,
refer to the applicable instruction manual.
Length of the Pump Stroke
CAUTION: To avoidequipment damage, do notforcethestrokecontrol
above 100% or below the 0% position. If it is hard to turn, have the
pump operating and then turn the stroke control knob.
•
Manual Positioning: Pump stroke length is adjusted by turning the
stroke control knob (47, Dwg. 440.400.000.010B). Percent stroke
length is shown on the micrometer scale, which consists of a linear
scale and a circular scale. Ten turns of the knob covers 0 to 100% of
WT.440.400.001.UA.IM.1012
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