Table of Contents
Advertisement
Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P
11 Operation
Caustic burns or other burns through dosing media!
After connecting the mains supply, residual dosing media in the
dosing head can spray out.
ð
Before connecting the mains supply, connect the dosing lines.
ð
Check that all the screw connections have been tightened
correctly and are leak-proof.
Danger of automatic start up!
The dosing pump does not have an ON/OFF switch and may start to
pump as soon as it is connected to the mains supply. This means that
dosing medium can escape. Depending on the type and hazardous-
ness of the dosing medium, this can result in injury.
ð
Stop the dosing pump before disconnecting it from the mains
supply.
ð
Ensure that the dosing pump has been installed correctly before
connecting it to the mains supply.
11.1 Commissioning the dosing pump
Precondition for action:
ü
The dosing pump has been assembled and installed in accordance
with chapter 7 "Installing the Dosing Pump" on page 17, chapter 8
"Hydraulic installations" on page 18 and chapter 9 "Electrical
installation" on page 24.
ü
All the mechanical fastenings have been inspected to ensure
adequate load-bearing capacity.
ü
The dosing head screws have been tightened with the correct torque
(see chapter 12.2 "Tighten up dosing head bolts" on page 34).
ü
All the hydraulic sections have been inspected to ensure they are
adequately leak-proof and that the through flow direction is correct.
i
For initial commissioning, it is advisable to use water as the
dosing medium to check that the system is leak-proof and that
the dosing pump is functioning correctly. Check first whether
undesirable reactions could occur between the actual dosing
medium and the water.
Perform the following working steps:
1. Open the shut-off valves on the suction and discharge sides if
present.
2. Plug in the dosing pump's mains plug to the power supply.
3. If the dosing head is fitted with a vent screw, vent the dosing pump
(see section 11.1.1 "Venting the dosing pump" on page 30).
Operation
30
Commissioning the dosing pump
WARNING
CAUTION
4. NXP-M: Turn the stroke frequency setting slowly counter-clockwise
until the dosing pump draws in enough and dosing starts.
NXP-P: Select an operating mode and start the dosing pump in
accordance with the instructions in the chapter 11.2 "NXP-P:
Operating modes" on page 31.
4
The dosing pump primes. If it does not prime enough, use a priming
aid (see chapter 8.7.6 "Priming aid" on page 22).
i
At initial commissioning, it is advisable to prime the pump
without backpressure. For this purpose, we recommend
installing a relief valve on the discharge side of the dosing
pump.
ü
The dosing pump is commissioned.
11.1.1 Venting the dosing pump
Size NXP-M/P 68, 140, 285 plastic dosing heads are fitted with a vent
screw. Gas bubbles can be removed from the dosing head using vent
screws, in order to improve the performance of the pumps / to remedy
faults.
Danger of personal injury and material damage!
Dosing medium can escape if you loosen connections on the dosing
head (e.g. for venting) during operation.
ð
Use sufficient personal protective equipment.
ð
Follow the safety data sheet of the dosing medium.
ð
Clean the dosing pump if dosing medium escapes.
ð
Dispose of the dosing medium correctly.
Fig. 28: Dosing head venting facility with vent screw
Precondition for action:
ü
The dosing head venting facility connected has been connected in
accordance with the chapter 8.6 "Connecting the dosing head
venting facility" on page 21.
Operating instructions
CAUTION
Advertisement
Table of Contents
