23
4
Continue to run the pump for 30 minutes or longer to let it warm up. Check that no
abnormality is found. This procedure is necessary only during the first operation, but when the
ambient temperature is extremely low, continue no-load running until the oil temperature rises
sufficiently because the motor may sometimes be overloaded a little due to an increase in the
viscosity of oil in the drive unit.
5. Open an air vent valve to purge the discharge line of air.
6.
Increase the stroke length up to 100% and continue to run the pump for 30 minutes or longer
again.
7.
Close the air vent valve gradually, watching the pressure gauge. The liquid will come into the
discharge line and be discharged from the end of the pipe. Should the discharge pressure
exceed the permissible pressure for the pump before the air vent valve is completely closed,
check the piping system.
8.
Check that the motor amperage does not exceed the rated value and that no abnormality is
found.
Metering and Calibration
1. Operate the pump using the actual liquid and installation conditions.
2. Setting the stroke length at 100%, determine the discharge capacity per minute several times. If
no noticeable variation is found after repeated measuring, the pump is working normally.
3. Measure the discharge capacity at two or three points of the stroke length. When a set point is
changed, measure the discharge capacity after running one minute or longer.
4. Plot a pump calibration curve using the results of the above procedures.
[Note] Our in-plant test data is based on pumping water at normal ambient temperature with a
short piping system. Therefore, there will be a difference between the test data and the practical
performance data.
5. The relationship between the amount of stroke length dial revolution and stroke length is shown
in the following graphs.
LKN3
0 ½ 1 1½ 2
Revolution
St
ro
ke
le
ng
th
%
25
50
75
10
0
St
ro
ke
le
ng
th
%
0 1 ½ 3 4½ 6
Revolution
St
ro
ke
le
ng
th
%
25
50
75
10
0
LKN4
0 2 4 6 8 10
Revolution
20
40
60
80
1
00
LKN5
