KNF NMP 830 KPDC User manual

KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English Keep for future use
Operating and Installation Instructions
Micro Diaphragm Gas Pumps
Type range:
NMP 830 KPDC
NMP 830 KPDC-B
NMP 830 KNDC
NMP 830 KNDC-B
NMP 830 KNE
NMP 830 KVDC
NMP 830 KVDC-B
NMP 830 KVE
NMP 830 KTDC
NMP 830 KTDC-B
NMP 830 KTE
NMP 850 KPDC
NMP 850 KPDC-B
NMP 850.1.2 KPDC-B
NMP 850 KTDC
NMP 850 KTDC-B
NMP 850.1.2 KTDC-B
You have selected a high-quality KNF product; the following tips will help you operate it safely, and
reliably over a long period of time. Carefully study the Operating and Installation Instructions before
using the pumps and observe at all times the relevant instructions to avoid dangerous situations. The
manual was produced for the serial pumps stated above. With customer-specified projects (pump
types starting with “PJM“ or “PMM“) there could be differences in detail. For customer-specified pro-
jects please therefore take into account any agreed technical specifications, as well as these instruc-
tions.
Contents Page
1. About this document................................................................. 2
2. Use........................................................................................... 3
3. Safety ....................................................................................... 4
4. Technical Data.......................................................................... 6
5. Design and function................................................................ 10
6. Installation and connection..................................................... 11
7. Operation................................................................................ 15
8. Servicing................................................................................. 16
9. Troubleshooting...................................................................... 20
10. Returns................................................................................... 22
KNF Micro AG
Zelglimatte 1b
CH-6260 Reiden
Switzerland
Phone [phone]
E-mail: [e-mail]
www.knf.com

Diaphragm Pumps NMP 830, NMP 850 About this document
KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English 2
1. About this document
1.1. Using the Operating and Installation Instruc-
tions
The Operating and Installation Instructions are part of the pump.
➔Pass on the Operating and Installation Instructions to the next
owner.
Customer-specific project pumps (pump models which begin with
"PJ", "PM", "PJM" or "PMM") may differ from the Operating and
Installation Instructions.
➔For project pumps, also observe the agreed upon specifica-
tions.
1.2. Symbols and markings
Warning
WARNING
A danger warning is located here.
Possible consequences of a failure to observe the
warning are specified here. The signal word, e.g.
Warning, indicates the danger level.
➔Measures for avoiding the danger and its conse-
quences are specified here.
Danger levels
Signal word
Meaning
Consequences if not observed
DANGER
warns of immedia-
te danger
Death or serious injuries
and/or serious damage are the
consequence.
WARNING
warns of possible
danger
Death or serious injuries
and/or serious damage are
possible.
CAUTION
warns of a possibly
dangerous situa-
tion
Minor injuries or damage are
possible.
Tab. 1
Other information and symbols
➔An activity to be carried out (a step) is specified here.
1. The first step of an activity to be carried out is specified here.
Additional, consecutively numbered steps follow.
This symbol refers to important information.
Project pumps

Diaphragm Pumps NMP 830, NMP 850 Use
KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English, 3
2. Use
2.1. Proper use
The pumps are exclusively intended for transferring gases.
Owner's responsibility
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4, Technical data.
Only complete pumps may be taken into service.
Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
Before using a medium, check whether the medium can be trans-
ferred danger-free in the specific application case.
Before using a medium, check the compatibility of the materials of
the pump head, pump housing, diaphragms, and valves with the
medium.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
2.2. Improper use
The pumps may not be operated in an explosive atmosphere.
The pumps are not suitable for transferring dusts.
The pumps are not suitable for transferring vapors and liquids.
The pumps must not be used to create vacuum and overpressure
simultaneously.
An overpressure must not be applied to the suction side of the
pump.
Operating parameters and
conditions
Requirements for
transferred medium

Diaphragm Pumps NMP 830, NMP 850 Safety
KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English, 4
3. Safety
Note the safety precautions in Chapters 6. Installation and
connection, and 7. Operation.
The pumps are built according to the generally recognized rules of
technology and in accordance with the occupational safety and
accident prevention regulations. Nevertheless, dangers can result
during their use which lead to injuries to the user or others, or to
damage to the pump or other property.
Only use the pumps when they are in a good technical and proper
working order, in accordance with their intended use, observing the
safety advice within the Operating and Installation Instructions, at
all times.
Make sure that only trained and instructed personnel or specially
trained personnel work on the pumps. This especially applies to
assembly, connection and servicing work.
Make sure that the personnel has read and understood the Operat-
ing and Installation Instructions, and in particular the "Safety"
chapter.
Observe the accident prevention and safety regulations when
performing any work on the pump and during operation.
When transferring dangerous media, observe the safety regula-
tions when handling these media.
Be aware that the pumps are not designed to be explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed to the maximum permissible operating pressure of the
pump.
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and inter-
national regulations. This especially applies to parts contaminated
with toxic substances.
For the purposes of the Machinery Directive 2006/42/EC, pumps
are “partly completed machinery,” and are therefore to be regarded
as not ready for use. Partly completed machinery may not be
commissioned until such time as it has been determined that the
machine in which the partly completed machinery is to be
assembled is in conformity with the provisions of the Machinery
Personnel
Working in a safety-
conscious manner
Handling dangerous media
Handling combustible media
Environmental protection
EC Directives / Standards

Diaphragm Pumps NMP 830, NMP 850 Safety
KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English, 5
Directive 2006/42/EC. The following essential requirements of
Annex I of Directive 2006/42/EC (general principles) are applied
and observed:
−General Principles No. 1
−No. 1.1.2. / 1.1.3. / 1.3.1. / 1.3.3. / 1.3.4. / 1.4.1. / 1.5.1.* /
1.5.2.* / 1.5.8. / 1.5.9. / 1.7.4. / 1.7.4.1. / 1.7.4.3.
(* only for pump type NMP 830 K_E)
As these partly completed machinery are OEM-models the power
supplies and the equipment for disconnecting and switching-off the
partly completed machinery respectively have to be considered
when mounting as well as over-current and overload protective
gear.
In addition a protection against mechanical parts in motion and hot
parts, if existing, has to be provided when mounting.
The pumps conform to the Directive 2011/65/EU (RoHS2).
The pumps conform to the EC Directive 2004/108/EC concerning
Electromagnetic Compatibility.
The following harmonized standards have been used:
NMP 830 K_E
NMP 830 K_DC
NMP 850 K_DC
NMP 830 K_DCB
NMP 850 K_DCB
NMP 850.1.2 K_DCB
DIN EN 55014-1/2
DIN EN 55014-1/2
DIN EN 55014-1
DIN EN 61000-3-2/3
DIN EN 60034-1
DIN EN 61000-6-2
DIN EN 60335-1
DIN EN 61000-6-1/2
Tab. 2
Only have repairs to the pumps carried out by the KNF Customer
Service responsible.
Customer service and
repairs

Diaphragm Pumps NMP 830, NMP 850 Technical Data
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Translation of original Operating and Installation Instructions, English, 6
4. Technical Data
Pump materials
NMP 830 KPDC, NMP 830 KPDC-B
Assembly
Material
Head plate; intermediate plate
PPS
Housing
PA-GF50
Valve plate
EPDM
O-ring
EPDM
Diaphragm
EPDM
Tab. 3
NMP 830 KNDC, NMP 830 KNDC-B
NMP 830 KNE
Assembly
Material
Head plate; intermediate plate
PPS
Housing
PA-GF50
Valve plate
CR
O-ring
NBR
Diaphragm
EPDM
Tab. 4
NMP 850 KPDC, NMP 850 KPDC-B
NMP850.1.2 KPDC-B
Assembly
Material
Head plate; intermediate plate
PPS
Housing
PA-GF50
Valve plate
EPDM
Diaphragm
EPDM
Tab. 5
NMP 830 KVDC, NMP 830 KVDC-B
NMP 830 KVE
Assembly
Material
Head plate; intermediate plate
PPS
Housing
PA-GF50
Valve plate
FPM
O-ring
FPM
Diaphragm
FPM
Tab. 6

Diaphragm Pumps NMP 830, NMP 850 Technical Data
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Translation of original Operating and Installation Instructions, English, 7
NMP 830 KTDC, NMP 830 KTDC-B
NMP 850 KTDC, NMP 850 KTDC-B
NMP 850 KTE, NMP 850.1.2 KTDC-B
Assembly
Material
Head plate; intermediate plate
PPS
Housing
PA-GF50
Valve plate
FFPM
O-ring
FPM
Diaphragm
PTFE coated
Tab. 7

Diaphragm Pumps NMP 830, NMP 850 Technical Data
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Translation of original Operating and Installation Instructions, English, 8
Pneumatic values
Pump type
Delivery rate at
atm. pressure
[l/min]*
Max. permissible
operating pressure
[bar g]
Ultimate vacuum
[mbar abs.]
NMP 830 KNE
1.8
1
250
NMP 830 KVE
NMP 830 KTE
1.6
310
NMP 830 KPDC
3.1
250
NMP 830 KNDC
NMP 830 KVDC
2.7
NMP 830 KTDC
2.6
350
NMP 830 KNDC-B
2.5
1.4
240
NMP 830 KVDC-B
2.1
NMP 830 KTDC-B
1.3
330
NMP 850 KPDC
4.5
1.5
230
NMP 850 KTDC
3.9
300
NMP 850 KPDC-B
4.2
230
NMP 850 KVDC-B
3.5
300
NMP 850.1.2 KPDC-B
8
230
NMP 850.1.2 KTDC-B
6
300
Tab. 8 * Liters in standard state (1,013 mbar)
Electrical data
Parameter
Value
Electrical data
See type plate
Tab. 9
Dimensions
Pump type
Dimensions [L x W x H]
NMP 830 E
approx. 98 x 56 x 66
NMP 830 DC
approx. 76 x 30,5 x 51
NMP 830 DC-B
approx. 63.5 x 54x 66
NMP 850 DC
approx. 80.5 x 38 x 54
NMP 850 DC-B
approx. 76.5 x 54 x 69.5
NMP 850.1.2 DC-B
approx. 143 x 76 x 59
Tab. 10
Weight
Pump type
Weight [kg]
NMP 830 E
approx. 0.590
NMP 830 DC
approx. 0.195
NMP 830 DC-B
approx. 0.270
NMP 850 DC
approx. 0.210
NMP 850 DC-B
approx. 0.360
NMP 850.1.2 DC-B
approx. 0.430

Diaphragm Pumps NMP 830, NMP 850 Technical Data
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Translation of original Operating and Installation Instructions, English, 9
Tab. 11
Other parameters
Parameter
Values
Pneumatic connections
NMP 830
For tube ID 4 mm
Pneumatic connections
NMP 850
For tube ID 5 mm
Pneumatic connections
NMP 850.1.2
For tube ID 4 mm
Permissible
ambient temperature
+ 5 °C to + 40 °C
Permissible media temperature
+ 5 °C to + 40 °C
Maximum permissible ambient
relative humidity
80 % for temperatures up to
31 °C, decreasing linearly to
50 % at 40 °C
Max. altitude of site
[m above sea level]
2000
Tab. 12

Diaphragm Pumps NMP 830, NMP 850 Design and function
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Translation of original Operating and Installation Instructions, English, 10
5. Design and function
Design
1Motor
2Inlet
3Outlet
4Pump head
Fig. 1: Diaphragm pump NMP 830__DC
Function
1Outlet valve
2Inlet valve
3Transfer chamber
4Diaphragm
5Eccentric
6 Connecting rod
7Pump drive
Fig. 2: Pump head
The pumps transfer, compress and evacuate gases.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connecting rod (6). In the downward stroke it aspirates
the gas to be transferred via the inlet valve (2). In the upward
stroke, the diaphragm presses the medium out of the pump head
via the outlet valve (1). The transfer chamber (3) is hermetically
separated from the pump drive (7) by the diaphragm.

Diaphragm Pumps NMP 830, NMP 850 Installation and connection
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Translation of original Operating and Installation Instructions, English, 11
6. Installation and connection
Only install and operate the pumps under the operating parameters
and conditions described in Chapter 4, Technical data.
Observe the safety precautions (see Chapter 3).
6.1. Installation of the pump
➔Before installation, store the pump at the installation location to
bring it up to ambient temperature.
➔See the data sheet for the mounting dimensions.
➔Make sure that the installation location is dry and the pump is
protected against rain, splash, hose and drip water.
➔Install the pump at the highest point in the system to prevent
condensate from collecting in the pump head.
➔Choose a safe location (flat surface) for the pump.
➔Protect the pump from dust.
➔Protect the pump from vibrations and jolts.
For pumps with alternating current motors:
WARNING
Danger of injury during operation
➔Take protective measures against touching parts
which are energised (live), such as electrical
connections or windings.
➔Take protective measures against touching
moving parts (e.g. fan).
Danger of damaging the pump during operation
➔Take protective measures to ensure that no
foreign objects can get into the pump or pene-
trate the motor (see protection class).
6.2. Electrical connection
For pumps with alternating current motors:
DANGER
Risk of electric shock, danger of death
➔Pump should only be connected by a specialist.
➔Only connect the pump when the power supply
is turned off.
For pumps with alternating current motors:
➔Only have the pump connected by an authorized specialist.
➔Only have the pump connected when the power supply is
disconnected.
➔All electrical connection work must adhere to the pertinent
guidelines, regulations and technical standards.
Mounting dimensions
Installation location
Touch and foreign object
protection

Diaphragm Pumps NMP 830, NMP 850 Installation and connection
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Translation of original Operating and Installation Instructions, English, 12
Connecting pump
1. Compare the supply data with the data on the motor-plate. For
operating current see type plate.
The voltage must not vary by more than + 10% and - 10% from
that shown on the type-plate.
2. Connect the earth (ground) wire to the motor (not necessary on
dc motors up to 24V).
3. Connect the positive and negative pole.
Always check polarity of cables.
For DC motors:
red motor lead: +
black motor lead: -
In the case of brushless DC motors:
incorrect polarity may cause damage to the electronics.
The Tests:
- Magnetic field with energy-technical frequency
- Electromagnetic HF field, amplitude-modulated
- Electromagnetic HF field, pulse-modulated
- Discharging of static electricity
- High frequency, asymmetric
- Fast transients
were not carried out, cause the products do not contain electronic
modules, which can be affected by these tests.
The Surge-test can only be passed with additional means, or is not
mandatory, if:
From EN61000-6-1 technical norm for EMC protection, part 1,10
test demands for EMC protection, table 3, EMC protection, D.C.-
power in- and outputs. Remark 3: (quotation) Not to be used with
input connections which are foreseen for a connection with a
battery or a rechargeable battery which has to be removed or
disconnected from the device for the recharge.
Devices with a D.C. power input which are foreseen to be operated
with an A.C. / D.C. converter have to be tested at an A.C. power
input of an A.C. / D.C. converter fixed by the manufacturer. In case
the converter was not fixed they have to be tested at an A.C.
power input of a typical (usual) A.C. / D.C. converter.
The test is applicable for D C power inputs which are foreseen for
a permanent connection to cables which are longer than 10 m.
EMC-compatible Installation
brushed DC-Motor

Diaphragm Pumps NMP 830, NMP 850 Installation and connection
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Translation of original Operating and Installation Instructions, English, 13
In order to remove the electrical interference according to EN
55014-1:1993 + A1:1997 all pumps with brushless DC motor (DC-
B) must be equipped with an additional electronic circuit. This
electronic circuit has to be installed as close to the motor as possi-
ble.
The supplemental circuit must be structured according to the
following electrical diagram and the components defined therein in
order to achieve the required level of suppression
Fig. 3: Electrical diagram of the supplemental circuit
6.3. Pneumatic connection
➔Only connect components to the pump which are designed for
the pneumatic data of the pump (see Chapter 4, Technical da-
ta).
➔If the pump is used as a vacuum pump, safely discharge the
pump exhaust at the pump´s pneumatic outlet.
Connecting pump
A marking on the pump head shows the direction of flow.
1. Remove the protective plugs from the hose connectors.
2. Connect the suction line and pressure line.
3. Lay the suction and pressure line at a downward angle to
prevent condensate from running into the pump.
EMC-compatible Installation
brushless DC-Motor
C1: Capacitor
≥ 470 μF
Connected
components
Pump exhaust

Diaphragm Pumps NMP 830, NMP 850 Installation and connection
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6.4. Fixation
Fixation (for NMP830 and NMP850)
The pump offers two mounting points, which allow an easy fixation
of the pump with either 2x Delta PT35 screws on the side or 4x
DIN 912 M3 screws on the bottom with max. 0.5 Nm torque.
Fixation (for NMP830K_DC-B and NMP850K_DC-B)
The pump offers two different ways for mounting, which allow an
easy fixation of the pump with 2x Delta PT35 screws on the side or
2x DIN 912 M3 screws on the bottom.
Fixation (for NMP850.1.2)
The pump offers two different ways for mounting, which allow an
easy fixation of the pump with 2x DIN 912 M3 screws.

Diaphragm Pumps NMP 830, NMP 850 Operation
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Translation of original Operating and Installation Instructions, English, 15
7. Operation
Only operate the pumps under the operating parameters and
conditions described in Chapter 4, Technical data.
Make sure the pumps are used properly (see Chapter 2.1).
Make sure the pumps are not used improperly (see Chapter 2.2).
Observe the safety precautions (see Chapter 3).
WARNUNG
Hazard of the pump head bursting due to excessive
pressure increase
➔Do not exceed max. permissible operating
pressure (see Chapter 4, Technical data).
➔Monitor pressure during operation.
➔If the pressure exceeds the maximum permissi-
ble operating pressure, immediately switch off
pump and eliminate fault (see Chapter 8. Trou-
bleshooting).
➔Only throttle or regulate the air or gas quantity in
the suction line to prevent the maximum permis-
sible operating pressure from being exceeded.
➔If the air or gas quantity in the pressure line is
throttled or regulated, make sure that the maxi-
mum permissible operating pressure is not ex-
ceeded.
Excessive pressure (with all of the related hazards) can be
prevented by placing a bypass line with a pressure-relief valve
between the pressure and suctions sides of the pump. For
further information, contact our technical adviser (see front
page for telephone number).
➔With the pump at a standstill, open pressure vacuum and
suction lines to normal atmospheric pressure.
The pump may not start up against pressure or vacuum during
switch-on. This also applies in operation following a brief power
failure.
➔Make sure that normal atmospheric pressure is present in the
lines during switch-on.
➔Regulary inspect the pump for external damage or leaks.
Diaphragm and valve plate(s) are the only parts subject to
wear. Wear is usually indicated by a drastic reduction in the
pneumatic performance. When replacing parts proceed as de-
scribed in Chapter 8.
Pump standstill
Switching pump on
Inspection

Diaphragm Pumps NMP 830, NMP 850 Servicing
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Translation of original Operating and Installation Instructions, English, 16
8. Servicing
Before working on the pump, isolate the power supply secure-
ly, then check that the lines are not live.
Always change valve plate(s), diaphragm, and O-rings (if existing)
at the same time.
8.1. NMP 830
Type range
Part
Order-No.
NMP 830 KP_
1 Diaphragm
2 Valve plates
2 O-Rings
045742
125971
056651
NMP 830 KN_
1 Diaphragm
2 Valve plates
2 O-Rings
045742
125973
023544
NMP 830 KV_
1 Diaphragm
2 Valve plates
2 O-Rings
051574
126108
023545
NMP 830 KT_
1 Diaphragm
2 Valve plates
2 O-Rings
073735
125970
023545
Tab. 13: Parts
Tool
Torx screwdriver, Torx 10 IP
Pencil
Tab. 14: Tools
See fig. 4.
1. Mark the position of head parts relative to each other by a
drawing line with a pencil. This helps to avoid incorrect assem-
bly later.
2. Undo the four screws (1) in the head.
3. Lift the head plate (2) and the intermediate plate (5) complete
with valve plates (3) and O-rings (4) off the housing.
4. Hold the pump with one hand, so that the diaphragm is point-
ing downwards. Lift the diaphragm (6) by the opposing side
Parts required
Tools required
Connecting rod
Fig. 4: Pump head NMP 830 K_
Specification
1 Screw
2 Head plate
3 Valve plate
4 O-ring
5 Intermediate plate
6 Diaphragm
7 Spacer

Diaphragm Pumps NMP 830, NMP 850 Servicing
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Translation of original Operating and Installation Instructions, English, 17
edges, grasp it and unscrew it in the counter-clockwise direc-
tion.
5. Take the diaphragm spacers (7) off the threaded portion of the
diaphragm and put them on the threaded portion of the new di-
aphragm.
6. Move the connecting rod to the upper point.
7. Screw the new diaphragm (6) with spacers (7) clockwise onto
the connection rod and tighten hand-tight.
8. Place the intermediate plate (5) on the housing, in the position
indicated by the drawing line.
9. Exchange both valve plates (3) and both O-rings (4). The valve
plates for pressure and suction sides are identical, as are up-
per and lower sides of the plates.
10. Place the head plate (2) on the intermediate plate (5), in the
position indicated by the drawing line; gently tighten the four
screws (1) evenly and diagonally (if a torque screwdriver is
available: torque about 0.30 Nm).
11. Let the pump run.

Diaphragm Pumps NMP 830, NMP 850 Servicing
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Translation of original Operating and Installation Instructions, English, 18
8.2. NMP 850
Typre range
Parts
Order-No.
NMP 850 KP_
1 Diaphragm
1 Valve plate
314717
059785
NMP 850.1.2 KP_
2 Diaphragms
2 Valve plates
314717
059785
NMP 850 KT_
1 Diaphragm
1 Valve plate
059784
059786
NMP 850.1.2 KT_
2 Diaphragms
2 Valve plates
059784
059786
Tab. 15: Parts
Tools
Torx screwdriver, Torx 10 IP
Pencil
Tab. 16: Tools
See fig. 5.
For pump NMP 850.1.2 KPDCB:
To avoid opening the pneumatic connection between the pump
heads service the pump as described below with the following
addition: Make steps 1 to 3 and 11 for both pump heads together.
1. Mark the position of head parts relative to each other by a
drawing line with a pencil. This helps avoid incorrect assembly
later.
2. Undo the four screws (1) in the head.
3. Lift the head plate (2) and the intermediate plate (4) off the
housing.
4. Hold the pump with one hand, so that the diaphragm is point-
ing downwards. Lift the diaphragm (5) by the opposing side
edges, grasp it and unscrew it in the counter-clockwise direc-
tion.
5. Remove connection rod disc (6) and diaphragm spacers (7)
from the threaded pin of the diaphragm.
6. Push the connection rod disc (6) and the diaphragm spacers
(7) in this order onto the threaded pin of the new diaphragm.
Parts required
Tools required
Specification
1 Screw
2 Head plate
3 Valve plate (one piece)
4 Intermediate plate
5 Diaphragm
6 Connecting rod disc
7 Spacer
Fig. 5: Pump head NMP 850 K_

Diaphragm Pumps NMP 830, NMP 850 Servicing
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Translation of original Operating and Installation Instructions, English, 19
7. Move the connecting rod to the upper point.
8. Screw the new diaphragm (5) with connection rod disc (6) and
spacers (7) clockwise onto the connection rod and tighten
hand-tight.
9. Place the intermediate plate (4) on housing, in the position
indicated by the drawing line.
10. Place the new valve plate (3) on the intermediate plate (4).
11. Place the head plate (2) on the intermediate plate (4), in the
position indicated by the drawing line; gently tighten the four
screws (1), evenly and diagonally (if a torque screwdriver is
available: torque about 0.30 Nm).
12. Let the pump run.

Diaphragm Pumps NMP 830, NMP 850 Troubleshooting
KNF Neuberger BA121556-121559 NMP830_850-EN 0221.doc
Translation of original Operating and Installation Instructions, English, 20
9. Troubleshooting
➔Disconnect the pump power supply before working on the
pump.
➔Make sure the pump is deenergized and secure.
Check the pump (see Tab. 14 and 16).
Pump does not transfer
Cause
Fault remedy
Connections or lines blocked.
➔Check connections and lines.
➔Remove blockage.
External valve is closed or filter
is clogged.
➔Check external valves and filters.
Condensate has collected in
pump head.
➔Install pump at highest point in system.
Diaphragm or valve plates are
worn.
➔Replace pump.
Tab. 17
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
Condensate has collected in
pump head.
➔Install pump at highest point in system.
There is gauge pressure on
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.
➔Change the pressure conditions.
Pneumatic lines or connection
parts have an insufficient cross
section.
➔Disconnect pump from system to determine output values.
➔Eliminate throttling (e.g. valve) if necessary.
➔Use lines or connection parts with larger cross section if
necessary.
Leaks occur on connections,
lines or pump head.
➔Eliminate leaks.
Connections or lines completely
or partially jammed.
➔Check connections and lines.
➔Remove the jamming parts and particles.
Head parts are soiled.
➔Clean head components.
Diaphragm or valve plates are
worn.
➔Change diaphragm or valve plates (see Chapter 8 Servicing).
Tab. 18
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases.
2. Remove the pump
3. Clean the pump