Pfeiffer Vacuum MVP 020-3 AC User manual

PK 0217 BEN/R (1607)
OPERATING INSTRUCTIONS EN
Translation of the original instructions
MVP 020-3 AC
Diaphragm Pumps

Table of contents
2
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 Before switching on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.2 Cleaning and replacing diaphragms and valves . . . . . . . . . . . . . . . . . . . . 15
7.3 Checking the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
13 Technical data and dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
13.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
13.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
13.4 Substances in contact with the media. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

About this manual
3
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refers to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.com.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.com
For information about other certifications, if applicable, please see the signet on the prod-
uct or:
●www.tuvdotcom.com
●TUVdotCOM-ID 0000021320
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
MVP 020-3 AC Operating instructions
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
Safety
Pictographs
Instructions in the
text
Work instruction: here you have to do something.
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Power connection
Exhaust flange
2Safety
2.1 Safety precautions
●Before pumping dangerous, corrosive or environmentally hazardous media, take suit-
able precautions:
– Test the compatibility with substances in contact with the media.
– Prevent the release of process gases and their reaction products and by-products
or dispose of them according to the relevant regulations.
– Safety measures (e.g. wearing protective clothing and safety goggles) to prevent
inhalation and skin contact.
●Connect the vacuum pump to a shockproof socket only.
Prohibition of an action to avoid any risk of accidents, the disregarding
of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document
V
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum pump
must read and observe the safety-related parts of these operating instructions.
The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.

Safety
5
– Use only undamaged network cables which comply with the regulations.
– Make sure that the grounding is sufficient.
●Do not expose any body parts to the vacuum.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●Do not carry out any unauthorised modifications or conversions to the pumps.
●Depending on the operating and ambient conditions, the surface temperature of the
pumps may rise above 70 °C. Use suitable finger guards if necessary.
●The unit has been accredited with protection class IP 40. Take necessary measures
when installing into ambient conditions, which afford other protection classes.
●When returning the pumps to us please note the instructions in the Service section.
2.2 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Installation, operating and maintenance regulations must be complied with.
●Other accessories, than those described in this manual, must not be used without the
agreement of Pfeiffer Vacuum.
●When pumping gases which could form explosive or ignitable mixtures, take suitable
precautions:
– If necessary, connect inert gas for ventilation or gas ballast supply.
2.3 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●pumping of corrosive or explosive media
●operation in potentially explosive areas
●pumping of gases containing impurities such as particles, dusts and condensate; note
the vapour compatibility levels of the pump
●pumping of substances that tend to sublime
●use of the vacuum pump to generate pressure
●pumping of liquids
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
NOTICE
EC conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accord-
ingly.

6
Transport and storage
3 Transport and storage
3.1 Transport
Remove the locking cap from the vacuum and fore-vacuum flange immediately before
connecting!
Use only the handles provided for that purpose to lift the pump.
– Do not use the interhead connections on the top side of the pump to carry the
pump.
3.2 Storage
Check that all the openings on the pump are securely closed.
Store the pump in a cool, dry place; preferably at room temperatures (approx. 20 °C).
– For a longer period of storage, seal the pump in a PE bag with drying agents en-
closed.
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
●Pump model and model number
●Serial number
●Date of manufacture
Scope of delivery ●Pump with drive unit
●Operating instructions

Product description
7
4.2 Function
The diaphragm vacuum pumps of the series MVP 020-3 AC are dry compressor vacuum
pumps with 3 pump stages. The pumps are positive displacement pumps with a periodic
change of size of the suction chamber produced by the movement of the diaphragm. The
gas flow causes the valves to open and close automatically. The pump units are directly
connected to the drive motor.
Fig. 1: MVP 020-3 AC
1 Vacuum connection
2 Exhaust (with silencer)
9 Handle, removable
10 Interhead connection
11 Banjo bolt
13 Mains connection with secur-
ing ring and main switch
14 Voltage selection switch
20 Screw plug
20.1 Purge orifice, optional
10
9
2
13
14 20/20.1
11
1
V

8
Installation
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
●Consider the load-bearing capacity of the installation site.
●Maximum installation altitude 2000 m (above mean sea level)
●Permissible ambient temperature: +12 ... 40°C
●Maximum relative humidity 85%
Always place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Voltage and frequency information given on the motor rating plate must be visible.
– Keep the ventilation openings at the motor free, in order to provide sufficient cooling
air.
5.2 Connecting the vacuum side
Remove locking cap on intake connection and connect vacuum pump to the appara-
tus.
The connection between the pump and the vacuum chamber should be kept as short
as possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange con-
nections.
– Separators, filters etc. may be installed upstream to protect the pump (see acces-
sories). However, please observe the loss of pumping capacity due to the conduc-
tivity of the accessories.
5.3 Connecting the exhaust side
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
Lay piping from the pump sloping downward so that no condensate can flow back into
the pump; otherwise fit a condensate separator.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
Install the line without shut-off valves on the exhaust side.
Do not operate the pump with excess pressure at the inlet; observe the maximum al-
lowable pressures and pressure differences.

Installation
9
5.4 Connecting to the mains power supply
The pump is driven by single-phase extended voltage range motors with reversible volt-
age ranges.
Single phase motors The mains voltage must be determined on-site each time before the pump is installed
or moved to a different location.
Changing the voltage range
Disconnect the pump from the power supply.
Set the desired voltage range on the voltage selector switch using a suitable screw-
driver.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to health
and/or can pollute the environment, depending on the particular application.
Comply with the applicable regulations when working with toxic substances.
Only officially approved filter systems may be used to separate and remove these
substances.
NOTICE
Excess voltage!
Danger of destroying the motor.
Power connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and fre-
quency values.
To protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented.
NOTICE
Overvoltage!
An incorrect voltage range setting can damage the motor.
Always check the set voltage range before switching on the pump.
Only change the voltage range when the pump is disconnected from the power
mains.

10
Installation
Motor protection
A self-locking thermal winding protector switches off the pump motor in the event of over-
heating (> 95°C).
Allow the pump to cool off several minutes and do not switch it back on until it has
cooled off.
Intermittent operation with TC via relay box (accessory)
Connection of diaphragm pumps in the pumping station according wiring diagram in op-
erating instructions of the relay box (accessory):
Fig. 2: Connection of MVP 020-3 AC with relay box to TC 110/400
Switch position: "115/120" "230/240"
Voltage ranges: 90 ... 126 V, 50/60 Hz 180 ... 254 V, 50/60 Hz
115
230
11 5
230
11 5
230
3
Acc. A
MVP-Reihe
MVP series
TC
L
N
PE
PE
N
L´
4

Operation
11
6Operation
6.1 Before switching on
Compare the voltage information on the rating plate with the supply voltage.
Check that the exhaust connection allows free flow (max. permissible pressure 1100
hPa absolute).
– Activate the shut-off valves in such a way that they open before or at the same time
as the pump is started.
Protect the pump sufficiently from taking in contaminants by means of suitable precau-
tions (e.g. dust filters).
6.2 Switching on the pump
The pump can be switched on in any pressure range between atmospheric and
ultimate pressure.
The pump attains the stated values for throughput rates and ultimate pressure levels only
once the operating temperature is reached.
Switch on the pump with the vacuum flange closed and allow to warm up for 15 min-
utes.
Intermittentoperation
with TC via relay box
(accessory)
To prolong the life of diaphragm pumps, intermittent operations can be selected with
lesser gas throughputs of < 0.18 hPa l/s. This means that, dependent on the TMP power
take-up, the backing pump will be switched on and off. TMP power take-up is dependent
on the fore-vacuum pressure and gas throughput.
– By comparing the power take-up with an upper and a lower limit value, the relative
switch-on duration with lesser gas throughputs can be reduced to approx. 1 to 60%.
– To avoid too frequent switching on, the buffer volume in the fore-vacuum line should
amount to 0.5 liter from approx. 0.018 hPa l/s.
Note! For this operation mode there is no variable speed control possible.
Connect galvanic isolated PWM-signal to signal input 16.
– 0 V ==> Pump „off“
– 24 V ==> Pump „on“ (max. rotation speed)
6.3 Pumping condensable vapours
Steam or moisture from pumped media can condense in the vacuum pump and hence
impair the suction performance.
CAUTION
Dangerous overpressure overload!
Mixing up the connections leads to a dangerous overpressure overload in the pump,
and the motor could be damaged.
Before commissioning, make sure that no impermissibly high pressure arises on the
pressure side.
Start pumps at a maximum pressure differential of 1000 hPa between inlet and outlet.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient con-
ditions, the surface temperature of the pump may rise above 70 °C.
In this case, use suitable finger guards.

12
Operation
Purge orifice (option) The rate of expulsion of condensate can be increased by admitting a purge media (air)
and the pump will attain the specified ultimate pressure within a shorter time.
For this replace the screw plug 20 with a purge orifice 20.1.
6.4 Switching off
The pump can be switched off in any pressure range.
WARNING
Reactive, explosive or otherwise dangerous mixtures!
Uncontrolled gas inlet at the gas ballast valve can result in dangerous mixtures.
By implementing the required safety measures, the user must prevent potentially ex-
plosive mixtures from occurring in the inside of the pump and from being ignited in
the event of a diaphragm crack by mechanically produced sparks, hot surfaces or
static electricity.
If necessary, use inert gas for ventilation and gas ballast supply.
NOTICE
Bad ultimate pressure and damage to the pump!
Danger of condensation and a reduced ultimate pressure during operation without a gas
ballast or in case of insufficient supply of flushing gas.
Only pump vapors when the pump is warm and the gas ballast valve is open.
When the process has been completed, allow the pump to continue running for about
30 minutes at atmospheric pressure with the gas ballast open.
WARNING
Danger of process gas discharge!
For intake pressures > 500 hPa process gas can discharge at the gas ballast valve.
Use a suction line, if applicable.

Maintenance
13
7 Maintenance
7.1 Precautions
The valves and the diaphragms are wear parts. If the rated ultimate vacuum is no longer
achieved, the pump interior, the diaphragms and the valves must be cleaned and the di-
aphragms and valves must be checked for cracks or other damage.
Depending on individual cases it may be efficient to check and clean the pump heads on
a regular basis. In case of normal wear the lifetime of the diaphragms and valves is
10000 operating hours at nominal rotation speed.
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool.
Only dismantle the pump as far as necessary to carry out maintenance.
Use only alcohol or similar agents for cleaning pump parts.
Reassemble pump in reverse order.
WARNING
Pump parts may be contaminated from pumped media!
Danger of poisoning due to contact with harmful substances.
Decontaminate the pump before carrying out any maintenance work.
In the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.
NOTICE
Service work should be carried out by a qualified person only!
Pfeiffer Vacuum is not liable for any damage to the pump resulting from work carried out
improperly.
Take advantage of our service training programs; additional information at www.pfei-
ffer-vacuum.com.
Please state all the information on the pump rating plate when ordering spare parts.

14
Maintenance
Checklist for inspec-
tion, maintenance
and overhaul
Certain maintenance and overhaul work should only be performed by Pfeiffer Vacuum
Service (PV). Pfeiffer Vacuum will be released from all warranty and liability claims if the
required, below listed, intervals are exceeded or maintenance or overhaul procedures
are not performed properly. This also applies if replacement parts other than Pfeiffer Vac-
uum OEM replacement parts are used.
Depending on the process, the required intervals for inspection and maintenance may be shorter than
the guide values specified in the table. Please consult Pfeiffer Vacuum, if necessary.
Activity daily as required; at least once every six months as required; at least after 10000 h as required; at least every 2 years
Check silencer for contamination X
Clean, change valves and diaphragms X
Change silencer X

Maintenance
15
7.2 Cleaning and replacing diaphragms and valves
Cleaning and replac-
ing the valves
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool.
Disconnect the drive motor from the mains and secure it so that it cannot be switched
on.
Unscrew banjo bolt 11 with open-end wrench (SW 14) at housing cover 1.1;
– loosen connecting hose only at the top.
Loosen Phillips head screws at handle 9 and slide handle off the guide.
Unscrew cylinder head screws 1.3 at the pump head and remove housing cover 1.1;
be mindful of the position of the valve seals 3.
– If the valve seals stick to the housing cover, carefully loosen the seals, otherwise
remove the valve seals from the head covers.
– Replace damaged valve seals.
Remove head cover 3.1.
Clean all parts and inspect for wear.
Reassemble pump in reverse order.
Check the other membrane head in the same way.
Fig. 3: MVP 020-3 AC
NOTICE
Damage to the valves
Valves can be destroyed by gluing to after wrong installation.
Pay attention to the fitting position of the inlet and outlet valves. The valve flap of the
valves may not cover the groove in the head and housing cover.
1.1 Housing cover I
1.3 Cylinder head screw
2.1 Housing cover II
3 Valve seals
3.1 Head cover
4 Diaphragm spring
washer with square head
screw
5 Diaphragm
6 Diaphragm support disk
7 Washers
8 Housing bearing flange
9 Handle
10 Interhead connection
11 Banjo bolt
12 Usit-Ring
9
3
3.1
4
5
6
7
11
1. 3
1. 1
2.1
11
10
8

16
Maintenance
Changing the dia-
phragm
Attach the diaphragm key Carry out preliminary work as described before.
Carefully raise the diaphragm at the side without causing it any damage; do not use
sharp-edged tools.
Slide diaphragm key under the diaphragm until it reaches the support disk.
Use the diaphragm key to loosen the diaphragm support disk and unscrew together
with diaphragm and diaphragm clamping disk.
Detach diaphragm support disk 6 and diaphragm 5 from the square head of the con-
necting screw of the diaphragm clamping disk 4.
– If it is difficult to separate the old diaphragm from the diaphragm support disk 6,
loosen in alcohol or cleaning solvent, for example.
Assembly Assembling is carried out in reverse order.
Position new diaphragm 5 between diaphragm clamping disk 4 with square head
screw and diaphragm support disk 6; make sure that the square head screw of the
diaphragm clamping disk is correctly seated in the guide hole of the diaphragm sup-
port disk.
NOTICE
Damage to the pump and bad ultimate pressure!
A changed dead centre (TDC) leads in the most unfavorable case to a bearing damage.
Check for spacer disk 7.
Make sure that the original number is reassembled at the individual membrane head.

Maintenance
17
Assemble diaphragms with
diaphragm keys
Fig. 4: Position of the valve seal
Raise the diaphragm at the side and carefully slide the diaphragm key through to the
diaphragm support disk.
When existing, re-fit spacer disks 7 under the diaphragm support disk 6.
Screw diaphragm clamping disk, diaphragm, diaphragm support disk and spacer
disks (if applicable) by hand to connecting rod.
Bring the diaphragms into a position in which they are in contact with the housing and
centred with respect to the bore.
Refit head cover and valve seals in reverse order, taking care with the position of valve
seals (see fig.).
Mount housing cover 1.1;
– move housing cover slightly to make sure that the head covers are correctly posi-
tioned.
First gently and then firmly tighten diagonally-offset cheesehead screws 1.3; torque:
6 Nm.
Turn pump 180° and similarly disassemble diaphragm head.
Assemble handle 9 with screws and tighten.
– Check for correct position of the handle above the centre of gravity of the pump.
The handle is in correct position if the end of the handle matches with the end of
the housing cover.
Reassemble connecting hose 10 between the diaphragm heads and screw banjo bolt
tightly with open-end wrench (SW 14).
7654
33.1

18
Decommissioning
7.3 Checking the pump
8 Decommissioning
8.1 Shutting down for longer periods
Before shutting down the pump, observe the following procedure and adequately protect
the pump system against corrosion:
Shortly after conden-
sate has formed:
Let the vacuum pump continue to run for several minutes with the intake port open.
Should media get into the pump which could corrode the pump materials or form de-
posits, clean and check the diaphragm heads.
In the long term: Carry out the measures described for brief shutdowns.
Disconnect the pump from the equipment.
Close the gas ballast valve, if existing.
Close the inlet and outlet opening (e.g. with transport caps).
Store the pump in a dry place.
9 Malfunctions
Please note the following instructions should the pump malfunction:
The pump doesn’t achieve the specified values for throughput and ultimate pres-
sure!
A run-in period of several hours is required before the pump achieves its specifications.
Check connecting hoses between pump heads.
If necessary examine the work performed.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. The surface temperature of the pump may rise
above 105 °C in case of malfunction.
Carry out work on the pump only after it has cooled to a safe temperature.

Malfunctions
19
9.1 Rectifying malfunctions
Problem Possible causes Remedy
Pump will not start up Pump temperature too low Check control voltage
Thermal protection switch of the
motor has responded
Warm up pump to > 12 °C
Diaphragms or valves dirty Detect and fix cause of overheating; allow
pump to cool off, if necessary
Overpressure in the exhaust line Clean pump (see p. 13, chap. 7)
Pump switches off af-
ter a while after being
started
Thermal protection switch of the
motor has responded
Check exhaust line
Exhaust pressure too high Check opening of exhaust line and exhaust
accessories
Pump not achieving
the ultimate pressure
Condensate in the pump Operate pump for a longer period of time at
atmospheric pressure; open gas ballast
valve, if necessary
Flushing gas nozzle open Close flushing gas nozzle
Valves or diaphragms dirty or de-
fective
Clean or change valves and diaphragms
(see p. 13, chap. 7)
Leak in the system Repair leak
Pumping speed of
pump too low
Intake line not well dimensioned Keep connections as short as possible and
ensure that cross-sections are sufficiently
dimensioned
Exhaust pressure too high Check opening of exhaust line and exhaust
accessories
Unusual noises during
operation
Diaphragms or valves defective Clean or change valves and diaphragms
Suction chamber dirty Clean suction chamber
Silencer loose or missing Check silencer, replace if necessary
Valves dirty or defective Clean or change valves and diaphragms
Connection rod or motor bearing
defective
Contact Pfeiffer Vacuum Service
NOTICE
Service work should be carried out by a qualified person only!
Pfeiffer Vacuum is not liable for any damage to the pump resulting from work carried out
improperly.
Take advantage of our service training programs; additional information at www.pfei-
ffer-vacuum.com.
Please state all the information on the pump rating plate when ordering spare parts.

20
Service
10 Service
Pfeiffer Vacuum offers first-class service!
●Maintenance/repairs on the spot by Pfeiffer Vacuum field service
●Maintenance/repairs in the nearby service center or service point
●Fast replacement with exchange products in mint condition
●Advice on the most cost-efficient and quickest solution
Detailed information and addresses at: www.pfeiffer-vacuum.com (Service).
Maintenance and repairs in the Pfeiffer Vacuum ServiceCenter
The following steps are necessary to ensure a fast, smooth servicing process:
Download the forms "Service Request" and "Declaration on Contamination".1)
Fill in the "Service Request" form and send it by fax or e-mail to your service address.
Include the confirmation on the service request from Pfeiffer Vacuum with your ship-
ment.
Fill in the contamination declaration and enclose it in the shipment (required!).
Dismantle all accessories.
Send the pump in its original packaging if at all possible.
Sending of contaminated pumps or devices
No units will be accepted if they are contaminated with micro-biological, explosive or ra-
dioactive substances. “Hazardous substances” are substances and compounds in ac-
cordance with the hazardous goods directive (current version). If pumps are contaminat-
ed or the declaration on contamination is missing, Pfeiffer Vacuum performs
decontamination at the shipper's expense.
Neutralise the pump by flushing it with nitrogen or dry air.
Close all openings airtight.
Seal the pump or unit in suitable protective film.
Return the pump/unit only in a suitable and sturdy transport container and send it in
while following applicable transport conditions.
Service orders
All service orders are carried out exclusively according to our repair conditions for vacu-
um units and components.
1) Forms under www.pfeiffer-vacuum.com