ProMinent Makro/ 5 Operating Instructions Manual page 30

Start up
Installing a vent screw
Checking the oil level
Checking the direction of rotation
Fig. 15: Tapping the valve set disc
Adjusting the stroke length
30
Replace the sealing screw at the oil filler neck with the supplied
vent screw - see chapter "Overview of equipment and control ele‐
ments".
When the pump is idle, check whether the pump oil level slightly
covers the lower oil inspection window.
This indicates that the pump has not lost oil and consequently
been damaged.
When commissioning the unit, check whether the drive motor is
rotating correctly - check this against the arrow on the motor
housing or the diagram in the chapter entitled "Electrical Installa‐
tion."
Eliminating suction problems (only for single ball
valves with PTFE ball seat)
For suction problems occurring during start up:
Exclude the possibility that there are foreign bodies
–
in the valve.
Place the valve on a stable surface.
–
Using a hammer (1) and a brass bar (2), gently tap
–
the PTFE ball seat above the valve ball - see figure
below.
Then with the valve in a damp condition allow it to
–
prime.
Only adjust the stroke length when the pump is run‐
ning. This is easier and also better for the pump.
Correctly adjusting the pump:
Select as large a stroke length as possible for viscous feed
n
chemicals.
Select as large a stroke length as possible for outgassing feed
n
chemicals.
Select as high a stroke rate as possible for good mixing.
n
For precise metering using quantity-proportional metering, do
n
not set the stroke length to less than 30 %.
The pump can now be released for operation.