ProMinent Sigma 3 Basic Operating Instructions Manual page 48

Start up
Remove the gearbox vent stopper
Checking the oil level
Avoid particles
Checking the direction of rotation
Using the integral relief valve
48
CAUTION!
Possible environmental and material damage
In event the red gear bleeding plug is sealed, during
operation it prevents any pressure compensation
between the drive housing and the surroundings. This
ensure that oil can be pushed from the drive housing.
– Remove the gear bleeding plug before commis‐
sioning.
Before start up, remove the red gearbox vent stopper, see "Overview of
equipment and control elements" chapter.
When the pump is idle, check whether the oil level in the pump is in the
middle of the oil level indicator.
This will rule out the pump losing oil and suffering damage.
The valves may no longer close properly with feed
chemicals with a particle size of greater than 0.3 mm.
Install a suitable filter in the suction line.
–
When commissioning the unit, check whether the drive motor is rotating
correctly - check this against the arrow on the motor housing or the dia‐
gram in the chapter entitled "Electrical Installation."
WARNING!
Risk of injury from the fan impeller
The fan impeller beneath motor's fan cowling can cause
severe injuries while it is turning.
– The pump must only be connected to the mains
voltage with the fan cowling closed.
CAUTION!
Danger due to incorrect use of the integral relief valve
The integral relief valve can only protect the motor and
the gear, and then only against impermissible positive
pressure that is caused by the metering pump itself. It
cannot protect the system against positive pressure.
– Protect the motor and gear of the system against
positive pressure using other mechanisms.
– Protect the system against illegal positive pressure
using other mechanisms.