Operation
6.2 Start up
6.2.1 Switching on
✔ The pump is correctly set up and connected
✔ The motor is correctly set up and connected
✔ The motor is exactly aligned with the pump
✔ All connections are stress-free and sealed
✔ Any existing auxiliary operating systems are ready for oper-
ation
✔ All safety installations have been installed and tested for
integrity
✔ The pump has been correctly prepared, filled and bled
DANGER
Risk of injury due to running pump!
Do not touch the running pump.
Do not carry out any work on the running pump.
Allow the pump to cool down completely before commenc-
ing any work on it.
DANGER
Risk of injury and poisoning caused by pumped medium
spraying out!
Use protective equipment when carrying out any work on
the pump.
CAUTION
Material damage caused by dry r unning!
Make certain that the pump is properly filled.
CAUTION
Risk of cavitation when throttling down the suction flow
rate!
Fully open th e suction-side a rmature, do not use for adjust-
ing the flow rate.
Do not open the pressure-side armature beyond the oper-
ating point.
CAUTION
Material damage caused by overheating!
Do not operate the pump while the pressure-side armature
is closed.
Observe the minimum flow rate (→ Order data sheet).
1. Open the suction-side armature.
2. Close the pressure-side armature.
3. Switch on the motor and check for smooth running.
4. Once the motor has reached its nominal speed, slowly
open the pressure-side armature until the operating point
is reached.
5. For pumps with hot pumped media, make certain that tem-
perature changes do not exceed 50 °C/h.
6. After the first stresses caused by pressure and operating
temperature, check that the pump is not leaking.
7. For hot pumped media, briefly switch off the pump at oper-
ating te mperature, check t he alignment of the coupling and
realign the motor if necessary (→ 5.8 Fine alignment of the
coupling, Page 20).
6.2.2 Switching off
✔ The pressure-side armature is closed (recommended)
WARNING
Risk of injury caused by hot pump parts!
Use protective equipment when carrying out any work on
the pump.
1. Switch off the motor. Maintain the following functions if
applicable:
– for double mechanical seals: block pressure until the
pump is unpressurized
2. Check all connecting bolts and tighten if necessary.
22 NPC series BA-2005.07 EN – 02
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