UGSI Encore 700, Руководство по эксплуатации и обслуживанию

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CF.440.400.001.IM.0417
ENCORE
®
700 METERING PUMP
27
3.3 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 synchronism with
an intermittent fl ow. 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.
3.4 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.
3.4.1 Frequency of the Pump Stroke
The frequency of the pump stroke is determined by the gear ratio of the speed
reducer. Available speeds for the Encore 700 are listed in Table 3.1:
Table 3.1 - Pump Gear Ratios and Speeds
Available Gear
Ratios
Number of Strokes at
1725 rpm, 60 Hz
10:1 144 spm (50 Hz)
12:1 144 spm
24:1 72 spm
48:1 36 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 ap-
plicable instruction manual.
3.4.2 Length of the Pump Stroke
CAUTION: To avoid equipment damage, do not force the stroke control
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 the stroke length. Numbers on
the scale represent percent stroke. Each full turn of the knob will result in
a 10% change of the stroke length. Each graduation on the circular scale
!