Watson-Marlow 620DuN User manual

Watson-Marlow 620DuN and 620Du User Manual 1
WATSON-MARLOW BREDEL MANUALS
Watson-Marlow
620DuN / 620Du pumps
m-620dun-du-gb-02
1 Declaration of conformity 3
2 Declaration of incorporation 3
3 Five-year warranty 3
4 When you unpack your pump 4
5 Information for returning pumps 5
6 Peristaltic pumps - an overview 5
7 Safety notes 6
8 Pump specifications 8
8.1 Pressure capability 12
8.2 Dimensions 13
9 Good pump installation practice 14
9.1 General recommendations 14
9.2 Do’s and do not’s 15
10 Connecting this product to a
power supply 16
11 Start-up check list 17
12 Switching the pump on for the
first time 17
13 Switching the pump on in
subsequent power cycles
(if not in auto-restart mode) 19
14 Manual operation 20
14.1 Keypad functions 20
14.2 Speed 22
14.3 Direction 22
14.4 Keypad lock 23
14.5 Keypad beep 23
14.6 Manual operation and
remote digital inputs
and outputs 23
14.7 Backlight 24
14.8 Auto-restart 24
15 Main menu 25
15.1 Keypad functions in
menu screens 25
15.2 Main menu entry 25
16 Pin-secure process protection 27
17 Head and tubing calibration 28
18 Setup 31
18.1 Trim 32
18.2 Analogue 33
18.2.1 Input 1: speed 34
18.2.2 Scaling - stroke 35
18.2.3 Trim 36
18.2.4 Exit 36
18.3 Display 36
18.4 Pump I/D 37
18.5 Baud 38
18.6 Stop bits 38
18.7 Xon/Xoff 38
18.8 Flow units 39
18.9 Run time 40
18.10 Outputs 40
18.11 Remote stop 42
18.12 Auto-restart 43
18.13 Set maximum allowed
speed 44
18.14 Set minimum allowed
speed 44
18.15 Scrolling 45
18.16 Date and time 45
18.17 Backlight 46
18.18 ROM 46
18.19 Language 47
18.20 Defaults 47
18.21 Beep 48
18.22 Security code 49
18.23 Exit 50
19 Pin out details 50
20 MemoDose 52
20.1 Changing dosing speed 53
20.2 Footswitch operation and
other remote inputs and
outputs with MemoDose 54
21 Exit 54
22 Automatic control wiring using the
620N module 55
22.1 620N module removal and
replacement 55
22.2 Wiring up 56
22.3 Speed: analogue input 59
22.4 Scaling: analogue input 60
22.5 Speed: analogue output 61
22.6 Tachometer frequency
output 61
22.7 Run/stop input 62
22.8 Direction input 62
22.9 Auto / manual toggle
input 63
22.10 MemoDose input 63
22.11 Leak detection input 63
22.12 Outputs 1, 2, 3, 4 64
Contents

Watson-Marlow 620DuN and 620Du User Manual 2
22.13 Supply voltages 64
22.14 RS485 input 65
23 Automatic control wiring
without the 620N module 66
23.1 Speed: analogue input 1 68
23.2 Scaling: analogue input 2 69
23.3 Speed: analogue output 70
23.4 Tachometer frequency
output 70
23.5 Run/stop input 71
23.6 Direction input 71
23.7 Auto / manual toggle
input 72
23.8 MemoDose input 72
23.9 Leak detection input 73
23.10 Pump status outputs 74
23.10.1 Logic output 1 74
23.10.2 Logic output 2 75
23.10.3 Logic output 3 76
23.10.4 Logic output 4 76
23.11 Supply voltages 77
24 Automatic control and operation 78
25 Network control and operation 80
25.1 RS232 and RS485
command strings 82
26 Troubleshooting 83
26.1 Error codes 84
27 Drive maintenance 85
28 Drive spares 85
29 620RE, 620RE4 and 620R
pumpheads 86
29.1 620RE, 620RE4 and 620R
Key safety information 86
29.2 620RE, 620RE4 and 620R
safe-guarding 86
29.3 620RE, 620RE4 and 620R
pumping conditions 87
29.4 620RE, 620RE4 and 620R
pump installation 87
29.5 620RE, 620RE4 and 620R
general operation 88
29.6 620RE and 620RE4
tube element loading 89
29.7 620R continuous
tube loading 90
29.8 620RE, 620RE4 and 620R
tube element or
continuous tube removal 91
29.9 620RE, 620RE4 and 620R
maintenance 91
29.10 620RE, 620RE4 and 620R
CIP and SIP 94
29.11 620RE, 620RE4 and 620R
pumphead spares 95
30 620RE, 620RE4 and 620R
performance data 97
30.1 620RE, 620RE4 and 620R
flow rates 98
31 620R continuous tubing
product codes 100
32 620RE and 620RE4 LoadSure
tube element product codes 101
33 620L and 620LG pumpheads 102
33.1 620L and 620LG key
safety information 102
33.2 620L and 620LG guarding102
33.3 620L and 620LG pumping
conditions 103
33.4 620L and 620LG
removal and installation 103
33.5 620L and 620LG
tube loading 105
33.6 620L and 620LG care
and maintenance 106
33.7 620L and 620LG
track adjustment 106
33.8 620L and 620LG
pumphead spares 107
34 620L and 620LG
performance data 108
34.1 620L and 620LG
flow rates 108
34.2 620L tubing codes 109
34.3 620LG element codes 110
35 Pumping accessories 110
36 Trademarks 111
37 Warning not to use pumps in
patient-connected applications 111
38 Publication history 111
39 Decontamination certificate 112

Watson-Marlow 620DuN and 620Du User Manual 3
1 Declaration of conformity
This declaration was issued for Watson-Marlow 620DuN and 620Du pumps
on September 19, 2005. When this pump unit is used as a stand-alone
pump it complies with: Machinery Directive 98/37/EC, Low Voltage
Directive 73/23/EC, EMC Directive 89/336/EC.
This pump is ETL listed: ETL control number 3050250. Cert to CAN/CSA
std C22.2 No 61010-1. Conforms to UL std 61010A-1.
See 8 Pump specifications.
2 Declaration of incorporation
When this pump unit is to be installed into a machine or is to be assembled with
other machines for installations, it must not be put into service until the relevant
machinery has been declared in conformity with the Machinery Directive 98/37/EC
BS EN 60204-1.
Responsible person: Christopher Gadsden, Managing Director, Watson-Marlow
Limited, Falmouth, Cornwall TR11 4RU, England. Telephone [phone]
Fax [phone].
The information in this user guide is believed to be correct at the time of publica-
tion. However, Watson-Marlow Limited accepts no liability for errors or omissions.
Watson-Marlow Bredel has a policy of continuous product improvement, and
reserves the right to alter specifications without notice. This manual is intended for
use only with the pump it was issued with. Earlier or later models may differ. The
most up-to-date manuals appear on the Watson-Marlow website:
http://www.watson-marlow.com
3 Five-year warranty
520 cased pumps, 620 cased pumps and 720 cased pumps
For any 520, 620 or 720 cased pump purchased after 1 January 2007, Watson-
Marlow Limited (“Watson-Marlow”) warrants, subject to the conditions and excep-
tions below, through either Watson-Marlow, its subsidiaries, or its authorised distrib-
utors, to repair or replace free of charge, any part of the product which fails within
five years of the day of manufacture of the product. Such failure must have occurred
because of defect in material or workmanship and not as a result of operation of the
product other than in normal operation as defined in this pump manual.
Watson-Marlow shall not be liable for any loss, damage, or expense directly or indi-
rectly related to or arising out of the use of its products, including damage or injury
caused to other products, machinery, buildings, or property, and Watson-Marlow
shall not be liable for consequential damages, including, without limitation, lost prof-
its, loss of time, inconvenience, loss of product being pumped, and loss of produc-
tion. This warranty does not obligate Watson-Marlow to bear any costs of removal,
installation, transportation, or other charges which may arise in connection with a
warranty claim.
DuN, Du
DuN, Du
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 4
Conditions of and specific exceptions to the above warranty are:
Conditions
Products must be returned by pre-arrangement, carriage-paid, to Watson-
Marlow, or a Watson-Marlow approved service centre.
All repairs or modifications must have been made by Watson-Marlow Limited,
or a Watson-Marlow approved service centre or with the express permission of
Watson-Marlow.
Warranties purporting to be on behalf of Watson-Marlow made by any person,
including representatives of Watson-Marlow, its subsidiaries, or its distributors,
which do not accord with the terms of this warranty shall not be binding upon
Watson-Marlow unless expressly approved in writing by a Director or Manager
of Watson-Marlow.
Exceptions
The warranty shall not apply to repairs or service necessitated by normal wear
and tear or for lack of reasonable and proper maintenance.
All tubing and pumping elements as consumable items are excluded.
Products which, in the judgment of Watson-Marlow, have been abused, mis-
used, or subjected to malicious or accidental damage or neglect are excluded.
Electrical surge as a cause of failure is excluded.
Chemical attack is excluded
All pumphead rollers are excluded.
The 620R family of pumpheads are excluded from all warranty when pumping
above 2 bar while above 165rpm.
Pumpheads from the 313/314 and the Microcassette ranges and any 701
extension pumpheads are excluded and retain their one-year standard pump-
head warranty. The drive they are attached to is subject to the five-year war-
ranty as set out here.
Ancillaries such as leak detectors are excluded.
4 When you unpack your pump
Unpack all parts carefully, retaining the packaging until you are sure all components
are present and in good order. Check against the components supplied list, below.
Packaging disposal
Dispose of packaging materials safely, and in accordance with regulations in your
area. The outer carton is made of corrugated cardboard and can be recycled.
Inspection
Check that all components are present. Inspect components for damage in transit.
If anything is missing or damaged, contact your distributor immediately.
Components supplied
620Du and 620DuN pumps are available in two forms, dedicated to either 620R
series pumpheads or 620L series pumpheads. Pumps are supplied as:
Dedicated 620R pump drive unit fitted with 620R, 620RE or 620RE4 pumphead
(see 8. Pump specifications); OR: Dedicated 620L pump drive unit fitted with
620L or 620LG pumphead (see 8. Pump specifications)
A 620N module providing pump ingress protection to IP66, NEMA 4X, if a
620DuN.
Note: the module is attached for transit, but must be removed to allow wiring
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 5
up, voltage selection and fuse inspection and then re-affixed before the pump
is operated.
The designated mains power lead for your pump
PC-readable CDROM containing these operating instructions
Quick Start manual
Note: Some versions of this product will include components different from those
listed above. Check against your purchase order.
Storage
This product has an extended shelf life. However, care should be taken after storage
to ensure that all parts function correctly. Users should be aware that the pump con-
tains a battery with an unused life of seven years. Long-term storage is not recom-
mended for peristaltic pump tubing. Please observe the storage recommendations
and use-by dates which apply to tubing you may wish to bring into service after stor-
age.
5 Information for returning pumps
Equipment which has been contaminated with, or exposed to, body fluids, toxic
chemicals or any other substance hazardous to health must be decontaminated
before it is returned to Watson-Marlow or its distributor.
A certificate included at the rear of these operating instructions, or signed state-
ment, must be attached to the outside of the shipping carton. This certificate is
required even if the pump is unused.
If the pump has been used, the fluids that have been in contact with the pump and
the cleaning procedure must be specified along with a statement that the equipment
has been decontaminated.
6 Peristaltic pumps - an overview
Peristaltic pumps are the simplest pump, with no valves, seals or glands to clog or
corrode. The fluid contacts only the bore of a tube, eliminating the risk of the pump
contaminating the fluid, or the fluid contaminating the pump. Peristaltic pumps can
run dry.
How they work
A compressible tube is squeezed between a roller and a track on an arc of a circle,
creating a seal at the point of contact. As the roller advances along the tube, the
seal also advances. After the roller has passed, the tube returns to its original shape,
creating a partial vacuum which is filled by fluid drawn from the inlet port.
Before the roller reaches the end of the track, a second roller compresses the tube
at the start of the track, isolating a packet of fluid between the compression points.
As the first roller leaves the track, the second continues to advance, expelling the
packet of fluid through the pump’s discharge port. At the same time, a new partial
vacuum is created behind the second roller into which more fluid is drawn from the
inlet port.
Backflow and siphoning do not occur, and the pump effectively seals the tube when
it is inactive. No valves are needed.
The principle may be demonstrated by squeezing a soft tube between thumb and
DuN, Du
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 6
finger and sliding it along: fluid is expelled from one end of the tube while more is
drawn in at the other.
Animal digestive tracts function in a similar way.
Suitable applications
Peristaltic pumping is ideal for most fluids, including viscous, shear-sensitive, corro-
sive and abrasive fluids, and those containing suspended solids. They are especial-
ly useful for pumping operations where hygiene is important.
Peristaltic pumps operate on the positive displacement principle. They are particu-
larly suitable for metering, dosing and dispensing applications. Pumps are easy to
install, simple to operate and inexpensive to maintain.
7 Safety notes
In the interests of safety, this pump and the tubing selected should only be used by
competent, suitably trained personnel after they have read and understood this
manual, and considered any hazard involved. If the pump is used in a manner not
specified by Watson-Marlow Limited, the protection provided by the pump may be
impaired.
Any person who is involved in the installation or periodic maintenance of this equip-
ment should be suitably skilled or instructed and supervised using a safe system of
This symbol, used on the pump and in this manual,
means: Caution, risk of electric shock.
This symbol, used on the pump and in this manual,
means: Caution, refer to accompanying documents.
This symbol, used on the pump and in this manual,
means: Do not allow fingers to contact moving parts.
There is a user-replaceable type T5A H
250V fuse in the fuseholder in the centre of
the switchplate at the back of the pump.
The 620N module must be removed, if a 620DuN, to allow
access to the switchplate. See 22.1 620N module removal and
replacement. There are thermal fuses within the pump which
self-reset within 60 seconds; if they trip an error code is dis-
played. This pump contains no user-serviceable fuses or parts.
DuN, Du
This symbol, used on the pump and in this manual,
means: Recycle this product under the terms of the EU
Waste Electrical and Electronic Equipment (WEEE)
Directive.

Watson-Marlow 620DuN and 620Du User Manual 7
work. In the UK this person should also be familiar with the Health and Safety at
Work Act 1974.
There are moving parts inside the pumphead. Before opening the tool-
unlockable fixed guard (620R) or tool-unlockable track (620L), ensure that
the following safety directions are followed.
Ensure that the pump is isolated from the mains power.
Ensure that there is no pressure in the pipeline.
If a tube failure has occurred, ensure that any fluid in the pumphead has been
allowed to drain to a suitable vessel, container or drain.
Ensure that protective clothing and eye protection are worn if hazardous fluids
are pumped.
Primary operator protection from rotating parts of the pump is provided by the
pumphead fixed guard. Note that guards differ, depending on the type of
pumphead. See the pumphead sections of this manual: 29 and 33.
Secondary operator protection from rotating parts of the pump is provided by
indicator-only switching of the pumphead guard. This function will stop the
pump if the guard is inadvertently opened while the pump is running. For
details of permissible pumphead orientations, see the pumphead sections of
this manual: 29 and 33.
This pump must be used only for its intended purpose. The pump must be accessi-
ble at all times to facilitate operation and maintenance. Access points must not be
obstructed or blocked. The pump’s mains plug is the disconnecting device (for iso-
lating the motor drive from the mains supply in an emergency). Do not position the
pump so that it is difficult to disconnect the mains plug. Do not fit any devices to the
drive unit other than those tested and approved by Watson-Marlow. Doing so could
lead to injury to persons or damage to property for which no liability can be accept-
ed.
If hazardous fluids are to be pumped, safety procedures specific to the particular
fluid and application must be put in place to protect against injury to persons.
The exterior surfaces of the pump may get hot during operation. Do not take hold
of the pump while it is running. Let it cool after use before handling it.
No attempt should be made to run the drive without a pumphead fitted.
The pump weighs more than 18kg (the exact weight depends on model and pump-
head—see 8 Pump specifications). Lifting should be performed according to standard
Health and Safety guidelines. Finger recesses are built into the sides of the lower
shell for convenience in lifting; in addition, the pump can conveniently be lifted by
grasping the pumphead and (where fitted) the 620N module at the rear of the pump.
This product does not comply with the ATEX directive
and must not be used in explosive atmospheres.
Fundamental work with regard to lifting,
transportation, installation, starting-up,
maintenance and repair should be per-
formed by qualified personnel only. The unit must be isolated
from mains power while work is being carried out.

Watson-Marlow 620DuN and 620Du User Manual 8
8 Pump specifications
Labels fixed to the rear of the pump contain manufacturer and contact details, prod-
uct reference number, serial number and model details.
The same information is carried on the drive’s backplate, accessible when the 620N
module is removed. The picture below is how a 620Du looks from the box. The num-
ber of connectors varies according to the model.
DuN
DuN, Du
620DuN, IP66 NEMA 4X model and 620Du, IP31 model
This pump can be controlled from the keypad or remotely. It features:
Manual control
Speed adjustment; run and stop; direction control; keypad scaling; “max” key
for rapid priming.
Remote control
The pump can be digitally controlled with a contact closure or logic input signal.
Analogue control
The pump speed can be controlled through an analogue signal input in the
ranges 0-10V, 1-5V or 4-20mA. Scaling can be controlled similarly using
Analogue signal input 2.

Watson-Marlow 620DuN and 620Du User Manual 9
Outputs
A 0-10V, 4-20mA or 0-1478Hz output signal provides feedback of the pump
speed. There are four relay status outputs which can be configured in software
for a variety of pump parameters.
MemoDose
Allows repeat dosing. Stores in memory a pulse count from the motor. This
count is repeated each time START is pressed to provide a single-shot dose.
Calibration
Full calibration with default figures for a range of pumpheads and tubes.
Calibration dose facility.
Serial communications
Full pump control from a PC or other controller with the ability to network up to
16 pumps (620Du) or 32 pumps (620DuN).
Guard switch
Primary operator protection from rotating parts of the pump is provided by the
fixed guard. Secondary operator protection from rotating parts of the pump is
provided by indicator-only switching of the pumphead guard.
PIN-secure process protection
Two levels of control protection: main PIN code and user PIN code.
IP NEMA
1st Digit 2nd Digit
3
Protected against
ingress of solid objects
with a diameter of
more than 2.5mm.
Tools, wires etc with a
thickness of more than
2.5mm are prevented
from approach
1
Protection against
dripping water falling
vertically. No harmful
effect must be
produced
2
Indoor use to provide a
degree of protection
against limited
amounts of falling
water and dirt
5
Protected against
harmful dust deposits.
Ingress of dust is not
totally prevented but
the dust must not
enter in sufficient
quantity to interfere
with satisfactory
operation of the
equipment. Complete
protection against
contact
5
Protection against
water projected from a
nozzle against the
equipment (enclosure)
from any direction.
There must be no
harmful effect (water
jet)
12
Indoor use to provide a
degree of protection
against dust, falling
dirt and dripping, non-
corrosive liquids
13
Indoor use to provide a
degree of protection
against dust and
spraying of water, oil
and non-corrosive
coolants
6
Protection against
ingress of dust (dust-
tight). Complete
protection against
contact
6
Protection against
heavy seas or powerful
water jets. Water must
not enter the
equipment (enclosure)
in harmful quantities
(splashing over)
4X
Indoor or outdoor use*
to provide a degree of
protection against
splashing water, wind-
blown dust and rain,
hose-directed water;
undamaged by the
formation of ice on the
enclosure. (Resist
corrosion: 200-hour
salt spray)
IP (Ingress Protection) and NEMA definitions
* 620 cased pumps are rated to NEMA 4X (indoor use) only.

Watson-Marlow 620DuN and 620Du User Manual 10
Control range (turndown ratio) 0.1-265rpm (2650:1)
Supply voltage/frequency Filtered 100-120V/200-240V 50/60Hz 1ph
Maximum voltage fluctuation
±10% of nominal voltage. A well
regulated electrical mains supply is
required along with cable connections
conforming to the best practice of noise
immunity
Installation category
(overvoltage category) II
Power consumption 250VA
Full load current <1.1A at 230V; <2.2A at 115V
Eprom version Accessible through pump software
Enclosure rating - 620DuN
IP66 to BS EN 60529; Equivalent to
NEMA 4X to NEMA 250* (indoor use).
Suitable for heavy industrial, process
and filthy environments. The drive uses
a Gore membrane vent to equalise the
pressure inside the enclosure and to
prevent ingress of water and corrosive
vapours.
Enclosure rating - 620Du
IP31 to BS EN 60529. Equivalent to
NEMA 2, suitable for indoor use.
Protected against dripping water and
falling dirt. May be wiped with a damp
cloth, but should not be immersed.
Pumphead options (620R models) 620R, 620RE, 620RE4
Pumphead options (620L models) 620L, 620LG
Operating temperature range 5C to 40C, 41F to 104F
Storage temperature range -25C to 65C, -13F to 149F
Maximum altitude 2,000m, 6,560ft
Humidity (non-condensing)
(620Du)
80% up to 31C, 88F, decreasing
linearly to 50% at 40C, 104F
Humidity (condensing) (620DuN) 10% - 100% RH
Weight See table on previous page
Noise <70dB(A) at 1m
Pump specifications
* Protect from prolonged UV exposure.

Watson-Marlow 620DuN and 620Du User Manual 11
EC
harmonised
standards
Safety of machinery—electrical equipment of machines:
BS EN 60204-1
Safety requirements for electrical equipment for
measurement, control and laboratory use:
BS EN 61010-1 incorporating A2 Category 2, Pollution degree 2
Degrees of protection provided by enclosures (IP code):
BS EN 60529 amendments 1 and 2
Conducted emissions:
BS EN 55011 A1 and A2, Class A, called by BS EN 61000-6-4
Radiated emissions:
BS EN 55011 A1 and A2, Class A, called by BS EN 61000-6-4
Electrostatic discharge: BS EN 61000-4-2 A1 and A2
Radiated RF immunity:
BS EN 61000-4-3 A1 and A2, called by BS EN 61000-6-2
Fast transient burst:
BS EN 61000-4-4 A1 and A2, Level 3 (2kV),
called by BS EN 61000-6-2
Surge testing:
BS EN 61000-4-5 A1 and A2, called by BS EN 61000-6-2
Conducted RF immunity:
BS EN 61000-4-6, called by BS EN 61000-6-2
Voltage dips and interruptions:
BS EN 61000-4-11, called by BS EN 61000-6-2
Mains harmonics: BS EN 61000-3-2 Ed 2
Safety of machinery—basic concepts, general principles of
design: BS EN 292-1 and BS EN 292-2
Pumps and pump units for liquids—common safety
requirements: BS EN 809
Other
standards
UL 61010A-1
CAN/CSA-C22.2 No 61010-1
Conducted emissions FCC 47CFR, Part 15.107
Radiated emissions FCC 47CFR, Part 15
NEMA 4X to NEMA 250 (indoor use) for IP66 products only
Standards

Watson-Marlow 620DuN and 620Du User Manual 12
8.1 Pressure capability
0-4 bar higher pressure pumping
This pump’s default running speed is 165rpm. It can be run at any speed up to
265rpm. Please note, however:
The 620RE and 620RE4 rotor warranty is limited to 2 bar from 165rpm
to 265rpm.
A warning is displayed when the user sets the speed above 165rpm.
Note: Applies to 620RE MarkII and 620RE4 MarkII pumpheads only. (The
620LG is not limited).
The pump’s software records the duration of operation above 165rpm.
0-2 bar pressure pumping

Watson-Marlow 620DuN and 620Du User Manual 13
Drive only + 620R, 620RE + 620RE4 + 620L, 620LG
IP31 16.5kg, 36lb 6oz 19.6kg, 43lb 3oz 20.1kg, 44lb 5oz 24.3kg, 53lb 9oz
IP66 NEMA 4X 17.4kg, 38lb 6oz 20.5kg, 45lb 3oz 21.0kg, 46lb 5oz 25.2kg, 55lb 9oz
Unit weights
8.2 Dimensions

Watson-Marlow 620DuN and 620Du User Manual 14
9 Good pump installation practice
9.1 General recommendations
Position
A correctly engineered installation will promote long tube life. Site the pump on a
flat, horizontal, rigid surface, free from excessive vibration, to ensure correct lubri-
cation of the gearbox. Allow a flow of air around the pump to ensure that heat can
be dissipated. Ensure that the temperature around the pump does not exceed 40C.
Do not stack other 620 pumps on top of this pump. It is, however, acceptable to
stack other equipment on the upper surface of the 620 (as long as the ambient tem-
perature does not exceed 40C).
Emergency disconnection
The pump’s mains plug is the disconnecting device (for isolating the motor drive
from the mains supply in an emergency). Do not position the pump so that it is dif-
ficult to disconnect the mains plug. The STOP key on the keypad will always stop
the pump. However, it is recommended that a suitable local emergency stop device
is fitted into the mains supply to the pump.
Valves
Peristaltic pumps are self-priming and self-sealing against backflow. No valves are
required in inlet or discharge lines. Valves in the process flow must be opened before
the pump operates. Users are advised to fit a pressure relief device between the
pump and any valve on the discharge side of the pump to protect against damage
caused by accidental operation with the discharge valve closed.
The pump may be set up so that the direction of rotor rotation is clockwise or count-
er-clockwise, whichever is convenient.
Tubing materials: run-in advice
Sta-Pure and Marprene TM tubing are hard to compress when new. When using
tubing made of these materials, the first five pumphead revolutions should be at a
speed of 10rpm or greater. If the pump is run slower, the safety system built into
pump drive’s software may cause it to stop and display an over-current error
message.
Pressure advice
In most circumstances, rotor and tube life are maximised if the pumphead is run
slowly, particularly when pumping at high pressure. However, to maintain
performance at pressures above 2 bar, avoid running the pumphead below 50rpm.
If low-flow, high-pressure operation is necessary, switching to a smaller tube is
recommended.
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 15
9.2 Do’s and do not’s
Do not build a pump into a tight location without adequate airflow around the pump.
Do ensure that when the 620N watertight module is fitted the seals are intact and
properly located. Ensure that the holes for cable glands are properly sealed to main-
tain the IP66 / NEMA 4X rating.
Do not strap the control and mains power cables together.
Do keep delivery and suction tubes as short and direct as possible - though ideally
not shorter than 1m - and follow the straightest route. Use bends of large radius: at
least four times the tubing diameter. Ensure that connecting pipework and fittings
are suitably rated to handle the predicted pipeline pressure. Avoid pipe reducers and
lengths of smaller bore tubing than the pumphead section, particularly in pipelines
on the suction side. Any valves in the pipeline (not usually needed) must not restrict
the flow. Any valves in the flow line must be open when the pump is running.
Do use suction and delivery pipes equal to or larger than the bore of the tube in the
pumphead. When pumping viscous fluids use pipe runs with a bore several times
larger than the pump tube.
Do ensure that on longer tube runs at least 1m of smooth bore flexible tubing is con-
nected to the inlet and discharge port of the pumphead to help to minimize impulse
losses and pulsation in the pipeline. This is especially important with viscous fluids
and when connecting to rigid pipework.
Do site the pump at or just below the level of the fluid to be pumped if possible.
This will ensure flooded suction and maximum pumping efficiency.
Do keep the pumphead track and all moving parts clean and free from contamina-
tion and debris.
Do run at slow speed when pumping viscous fluids (though see Pressure advice in
9.1 General recommendations). Flooded suction will enhance pumping performance
in all cases, particularly for materials of a viscous nature.
Do recalibrate after changing pump tubes, fluid, or any connecting pipework. It is
also recommended that the pump is recalibrated periodically to maintain accuracy.
IP66 / NEMA 4X models may be hosed down, but should not be immersed. Protect
from prolonged UV exposure.
IP31 models may be wiped with a damp cloth, but should not be hosed or
immersed. The front of IP31 models is further protected against light spillages onto
the pump.
When using Marprene or Bioprene continuous tubing, do re-tension the tube
after the first 30 minutes of running.
Tube selection: The chemical compatibility lists published in Watson-Marlow pub-
lications are guides. If in doubt about the compatibility of a tube material and the
duty fluid, request a Watson-Marlow tube sample card for immersion trials.

Watson-Marlow 620DuN and 620Du User Manual 16
The voltage selector is mounted in the switchplate at
the rear of the pump, protected from water by the
620N module (620DuN). The module must be
removed to allow access to the switchplate. See 22.1
620N module removal and replacement. Set the
voltage selector to 115V for 100-120V 50/60Hz
supplies or 230V for 200-240V 50/60Hz supplies.
Always check the voltage selector switch before con-
necting the mains supply. Make suitable connection
to an earthed, single-phase mains electricity supply.
We recommend using commer-
cially available supply voltage
surge suppression where there
is excessive electrical noise.
DuN
Power cable: The pump is supplied fitted with either of two cable glands and
approximately 2.8m of power cable. The European cable is to Harmonised code
H05RN-F3G0.75, used with our gland part number SL0128 which is suitable for an
outside cable sheath diameter of 4-7mm. The north American cable is to type
SJTOW 105C 3-18AWG VW-1 used with our gland part number SL0123 which is suit-
able for an outside cable sheath diameter of 7-9mm.
Power cables of NEMA 4X specification pumps are fitted with a standard US mains
power plug. IP66 specification pumps are supplied with no plug. Wiring a mains plug
must only be undertaken by suitably skilled, qualified personnel.
DuN, Du 10 Connecting this product
to a power supply
A well regulated electrical mains supply is required along with cable connections
conforming to the best practice of noise immunity. It is not recommended to site
these drives alongside “dirty” electrical mains supplies such as 3-phase
contactors and inductive heaters without special attention being paid to
unacceptable mains-borne noise.
If the mains power cable is inappropriate for your installation, it can be changed.
Please contact your local Watson-Marlow Bredel service centre.
The voltage selector switch is not visible while the
620N module is in place. Do not switch the pump on
unless you have checked that it is set to suit your
power supply by removing the module and inspecting
the switch, and then refitting the module. See 22.1 620N
module removal and replacement.
DuN
DuN, Du
European North American
line brown black
neutral blue white
ground green/yellow green
Conductor coding

Watson-Marlow 620DuN and 620Du User Manual 17
Input line fusing: type T5A H 250V
20mm time-delayed cartridge fuse,
located in a fuseholder in the centre of
the switchplate at the rear of the pump.
Power interruption: This pump has
an auto-restart feature which, when
active, will restore the pump to the
operating state it was in when power
was lost. See 18.12 Auto-restart.
Stop / start power cycles: Do not
power up/power down for more than
100 starts per hour, whether manually
or by means of the auto-restart facility.
We recommend remote control where a
high number of starts is required.
11 Start-up check list
Note: See also 29.6, 29.7, 29.8 and 33.5, Tube loading.
Ensure that proper connections are achieved between the pump tube and
suction and discharge piping.
Ensure proper connection has been made to a suitable power supply.
Ensure that the recommendations in section 9 Good pump installation practice
are followed.
12 Switching the pump on
for the first time
Note: This manual uses bold type to highlight the active option in menu screens:
“English” in the first screen represented here. The active option appears on the
pump display in inverse text.
Switch on the power supply at the rear of the pump. The pump runs a power-
on test to confirm proper functioning of the memory and hardware. If a fault is
found, an error message is displayed. See 26.1 Error codes.
The pump displays a language menu. Use the UP and DOWN keys to select
your language. Press the ENTER key to confirm your choice.
The information which follows assumes that your choice was English.
DuN, Du
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 18
When the language is chosen this menu will not appear again and all menus
will appear in the language you chose. (Language can be reset as described
later. See 18.19 Language.)
The pump displays the Watson-Marlow start-up screen for four seconds,
followed by the pump model identity screen for four seconds, and then the
manual mode main screen.
The rotation symbol on the display indicates clockwise rotation. The default
speed setting is 165rpm, but 265rpm is available (see 18.13 Set maximum
allowed speed). Other initial start-up operational parameters are listed in the
table below.
First-time start-up defaults
Language Not set Analogue input 4-20mA
Speed 165rpm User trim None
Direction Clockwise Remote stop Open=run
Pumphead 620R Pump number 1
Tube size 15.9mm Baud rate 9600
Calibration 620R 15.9mm tube Stop bits 2
Backlight On Xon/Xoff Off
Keypad lock Off Scrolling increment 0.1rpm
Auto-restart Off Output 1 Run/Stop *
Scaling Off Output 2 Direction †
Pump status Stopped Output 3 Auto/Man ‡
Beeper On Output 4 General alarm
Manual screen rpm * Run = high
Security code Not set † Clockwise rotation = high
‡ Auto = high
Note: The settings shown above for Run, Clockwise rotation and Auto are those in
force on initial start-up for the functions available on Output 1, Output 2 and Output
3 respectively. For example, a high signal on Output 2 indicates clockwise rotation.
These can be changed later according to user requirements.
Note: High is equivalent to the common and normally open contacts of the relay on
the adapter board being closed.
The pump is now ready to operate according to the defaults listed above.
All operating parameters may be changed by means of key-presses. See 14 Manual
operation.

Watson-Marlow 620DuN and 620Du User Manual 19
13 Switching the pump on
in subsequent power cycles
(if not in auto-restart mode)
Switch on the power supply at the rear of the pump. The pump runs a power-
on test to confirm proper functioning of the memory and hardware. If a fault is
found, an error message is displayed. See 26.1 Error codes.
The pump displays the Watson-Marlow start-up screen for four seconds
followed by the pump model identity screen for four seconds, and then the
manual mode main screen.
Note: Once in the manual mode main screen, keys assume their normal func-
tions - see 15.1 Keypad in menu screens below. A subsequent press on START
causes the pump to operate.
Start-up defaults are those in place when the pump was switched off last.
Check that the pump is set to operate as you require it.
The pump is now ready to operate.
All operating parameters may be changed by means of key-presses. See 14 Manual
operation below.
DuN, Du

Watson-Marlow 620DuN and 620Du User Manual 20
14 Manual operation
14.1 Keypad functions
All settings and functions of the pump in manual mode are set and controlled by
means of key-presses. Immediately after the start-up display sequence detailed
above, the manual mode main screen will be displayed. The currently selected rota-
tion direction is indicated on the display by a clockwise or counter-clockwise seg-
mented arrow. If an exclamation
mark ( !) shows, it indicates that
Auto-restart is on. If a padlock icon
( ) shows, it indicates that
Keypad lock is on.
Note: A number of the controls
listed below are shortcuts to com-
mands which are also available
through the Main menu. See 15
Main menu.
Note: SHIFT gives access to func-
tions which appear on the upper
part of numeric keys. To access the
MAX function, for example, press
SHIFT once and release it. A sym-
bol appears in the bottom left of the display to indicate that the next keypress will
be SHIFTed. Press 4 (MAX).
A brief single press on each key triggers a beep sound (if enabled - see 14.5 Keypad
beep) and causes the pump to function as follows:
START: starts the pump at the speed and in the direction shown on the dis-
play. The rotation symbol will become animated to confirm that the pump is
operating.
If the pump is running when START is pressed, it causes the information
shown on the manual mode main screen to cycle from revolutions per minute,
to flowrate in a choice of units (via a warning screen if flowrate has not been
calibrated and if this is the first cycle since power-up) to rpm, flowrate and Run
time. An example is shown here. The default can be altered from within the
Setup menu (see 18.3 Display).
MAX (SHIFT, 4): while pressed, MAX (SHIFT, 4) operates the pump at the
maximum allowed speed and in the direction shown on the display. When
released, the pump returns to its previous status.
Note: Priming can be achieved by pressing MAX (SHIFT, 4) until fluid flows
through the pump and reaches the point of discharge, and then releasing MAX
(SHIFT, 4).
DuN, Du