Operation
Filling and venting the bearing housing (vertical version)
1. Remove the screw plugs A5 and E6.
2. Fill slowly wi th pumped liquid in filling hole A 5 until liquid
escapes from vent opening E6.
3. Screw in and tighten screw plugs A5 and E6.
6.1.5 Checking the direction of rot atio n
DANGER
Risk of death due to rotating parts!
Use personal protective equipment when carrying out any
work on the pump.
Keep an adequate distan ce to rotating parts.
NOTE
Material damage due to incorrect direction of rotation!
Make sure the d irection of rotation of the motor corre-
sponds to the arrow indicating the dire c tion of rotation on
the motor bell housing.
1. Switch the motor on and immediately off again.
2. Check whether the directio n of rota tion of the mo tor corre-
sponds to the arrow indicating the dire c tion of rotation on
the pump.
3. If the direction of rotation is different: swap two phases
(→ 5.5 Electrical connection, Page 18).
6.2 Start-up
6.2.1 Switching on
Pump aggregate set up and connected properly
All connections stress-free and sealed
Any available auxiliary systems are ready for operation
All s afety equipment installed and tested for fu nctionality
Pump prepared, filled and bled properly
DANGER
Risk of injury due to running pump!
Do not touch the running pump.
Ensure that the coupling gua rd is attached.
Do not carry out any work on the running pump.
Allow the pump to cool down comp letel y before starting any
work.
DANGER
Risk of injury and poisoning caused by pumped medium
spraying out!
Use personal protective equipment when carrying out any
work on the pump.
NOTE
Material damage caused by dry running!
Make sure the pump is filled properly.
NOTE
Risk of cavitation when throttling down the suction flow
rate!
Fully open the s uction-side armature and do not use it to
adjust the flow rate.
Do not open the pressu re-side armature beyond the oper-
ating point.
NOTE
Material damage caused by overheating!
Do not operate the pump for long periods with the pressure-
side fitting closed.
Observe the minimum flow rate (→ o rder data sheet).
1. Open the suction-side armature.
2. Close t he pressure-side arma
ture.
3. Switch on the mo t or and ch eck it for smooth running.
4. Once the motor has reached its nominal speed, open the
pressure-side armatu re slowly until the operating point is
reached.
5. For pumps with hot pum
ped liquids, make sure any tem-
perature c hanges
do not exceed 5 K/min.
20 NIT series BA-2017.03 en-U S 160-282/ 0 – 550 154
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