Watson Marlow Pumps 720DuN User manual

Watson-Marlow 720DuN User Manual 1
WATSON-MARLOW BREDEL MANUALS
Watson-Marlow 720DuN pumps
m-720dun-gb-02
Contents
1 Declaration of conformity 3
2 Declaration of incorporation 3
3 Five-year warranty 4
4 When you unpack your pump 5
5 Information for returning pumps 6
6 Peristaltic pumps: an overview 7
7 Safety notes 8
8 Pump specifications 10
8.1 Dimensions 15
9 Good pump installation practice 16
9.1 General recommendations 16
9.2 Do’s and do not’s 17
10 Connecting this product to a
power supply 18
11 Start-up check list 19
12 Switching the pump on for the
first time 20
13 Switching the pump on in
subsequent power cycles
(if not in auto-restart mode) 22
14 Manual operation 23
14.1 Keypad functions 23
14.2 Speed 26
14.3 Direction 26
14.4 Keypad lock 26
14.5 Keypad beep 27
14.6 Manual operation and
remote digital inputs
and outputs 27
14.7 Backlight 27
14.8 Auto-restart 28
15 Main menu 29
15.1 Keypad functions in
menu screens 29
15.2 Main menu entry 29
16 Pin-secure process protection 31
17 Head and tubing calibration 32
18 Setup 36
18.1 Trim 37
18.2 Analogue 38
18.2.1 Input 1: speed 39
18.2.2 Scaling - stroke 41
18.2.3 Trim 41
18.2.4 Exit 41
18.3 Display 42
18.4 Pump I/D 43
18.5 Baud 43
18.6 Stop bits 44
18.7 Xon/Xoff 44
18.8 Flow units 45
18.9 Counters 46
18.10 Outputs 47
18.11 Remote stop 49
18.12 Auto-restart 50
18.13 Set maximum allowed
speed 51
18.14 Set minimum allowed
speed 51
18.15 Scrolling 52
18.16 Date and time 53
18.17 Backlight 53
18.18 ROM 54
18.19 Language 54
18.20 Defaults 55
18.21 Beep 55
18.22 Security code 56
18.23 Exit 57
19 Pin out details 57
20 MemoDose 58
20.1 Changing dosing speed 60
20.2 Footswitch operation and
other remote inputs and
outputs with MemoDose 60
21 Exit 60
22 Automatic control wiring
using the 720N module 61
22.1 720N module removal and
replacement 61
22.2 Wiring up 62
22.3 Speed: analogue input 65
22.4 Scaling: analogue input 66
22.5 Speed: analogue output 67
22.6 Tachometer frequency
output 67
22.7 Run/stop input 68
22.8 Direction input 68
22.9 Auto / manual toggle
input 69

Watson-Marlow 720DuN User Manual 2
22.10 MemoDose input 69
22.11 Leak detection input 69
22.12 Outputs 1, 2, 3, 4 70
22.13 Supply voltages 70
22.14 RS485 input 71
23 Automatic control and operation 72
24 Network control and operation 75
24.1 RS485 command strings 77
25 Troubleshooting 78
25.1 Error codes 79
26 Drive maintenance 80
27 Drive spares 80
28 720R, 720RX, 720RE and
720REX pumpheads installation 81
28.1 Pumphead dos
and do nots 81
28.2 720R, 720RX, 720RE
and 720REX
Key safety information 82
28.3 720R, 720RX, 720RE
and 720REX
safe-guarding 82
28.4 All 720R and 720RE
pumping conditions 82
28.5 All 720R and 720RE
pumpheads: fluid
management 82
29 Pumphead fitting 83
29.1 Removing and refitting
the pumphead 83
29.2 Fitting an extension
pumphead 84
30 Tube loading 85
30.1 720R and 720RX
continuous tube loading 85
30.2 720RE and 720REX
LoadSure element loading 87
31 Pumphead spares: continuous
tubing models 720R and 720RX 88
32 Pumphead spares: LoadSure
element models 720RE and
720REX 89
33 Pumphead spares: rotor 90
34 All 720R and 720RE flow rates 91
35 720RE LoadSure element
product codes 92
36 720R continuous tubing product
codes 93
37 Trademarks 93
38 Warning not to use pumps in
patient-connected applications 93
39 Publication history 93
40 Decontamination certificate 94

Watson-Marlow 720DuN User Manual 3
1 Declaration of conformity
This declaration was issued for Watson-Marlow 720DuN pumps on May 1,
2007. When this pump unit is used as a stand-alone pump it complies
with: Machinery Directive 2006/42/EC, EMC Directive 2004/108/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
2006/42/EC.
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

Watson-Marlow 720DuN User Manual 4
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.
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.
620R pumphead rotors are consumable and excluded from all warranty when
pumping above 2 bar while above 165rpm.
Pumpheads from the 313/314 and the Microcassette ranges and any 701/720
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.

Watson-Marlow 720DuN User Manual 5
4 When you unpack your pump
Note on lifting: The pump weighs more than 18kg (the exact weight depends on
model and pumphead—see 8 Pump specifications). Lifting should be performed
according to standard health and safety guidelines.
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
720DuN pumps supplied as:
Dedicated 720 pump drive unit fitted with 720R, 720RE, 720RX or 720REX
pumpheads (see 8. Pump specifications).
A 720N module providing pump ingress protection to IP66, NEMA 4X.
Note: the module is attached for transit, but must be removed to allow wiring
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.

Watson-Marlow 720DuN User Manual 6
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.

Watson-Marlow 720DuN User Manual 7
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
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.

Watson-Marlow 720DuN User Manual 8
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.
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.
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.
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 720N module must be removed to allow
access to the switchplate. See 22.1 720N 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.
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.
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
work. In the UK this person should also be familiar with the Health and Safety at
Work Act 1974.

Watson-Marlow 720DuN User Manual 9
There are moving parts inside the pumphead. Before opening the tool-
unlockable track, 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 track. See the pumphead section of this manual: 28.
Secondary operator protection from rotating parts of the pump is provided by
indicator-only switching of the pumphead track. This function will stop the
pump if the track is inadvertently opened while the pump is running.
This product does not comply with the ATEX directive
and must not be used in explosive atmospheres.
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.
Lifting
The unit 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.

Watson-Marlow 720DuN User Manual 10
8 Pump specifications
Labels fixed to the rear of the pump contain manufacturer and contact details,
product reference number, serial number and model details.
The same information is carried on the drive’s backplate, accessible when the 720N
module is removed. The picture below is how a 720Du looks from the box. The num-
ber of connectors varies according to the model.

Watson-Marlow 720DuN User Manual 11
720DuN, IP66 NEMA 4X 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.
Outputs
A 0-10V, 4-20mA or 0-768Hz 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 via RS485 with the ability to
network up to 32 pumps.
Guard switch
Primary operator protection from rotating parts of the pump is provided by the
pumphead track. Secondary operator protection from rotating parts of the
pump is provided by indicator-only switching of the pumphead track.
PIN-secure process protection
Two levels of control protection: main PIN code and user PIN code.

Watson-Marlow 720DuN User Manual 12
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
* 720N cased pumps are rated to NEMA 4X (indoor use) only.
Unit weights
Drive only + 720R, 720RE + 720RX, 720REX
IP66 NEMA 4X 18.5kg, 40lb 13oz 25kg, 55lb 2oz 31.5kg, 69lb 7oz

Watson-Marlow 720DuN User Manual 13
Pump specifications
Control range (turndown ratio) 0.1-360rpm (3,600:1)
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 350VA
Full load current <1.5A at 230V; <3.0A at 115V
Eprom version Accessible through pump software
Enclosure rating - 720DuN
IP66 to BS EN 60529; Equivalent to
NEMA 4X to NEMA 250* (indoor use).
Suitable for heavy industrial, process
and dirty environments. The drive uses a
Gore membrane vent to equalise the
pressure inside the enclosure and to
prevent ingress of water and corrosive
vapours.
Pumphead options 720R, 720RE, 720RX, 720REX
Operating temperature range 5C to 40C, 41F to 104F
Storage temperature range -40C to 70C, -40F to 158F
Maximum altitude 2,000m, 6,560ft
Humidity (condensing) (720DuN) 10% - 100% RH
Weight See table on previous page
Noise <85dB(A) at 1m
Max peak pressure rating †2 bar (30 psi)
* Protect from prolonged UV exposure.
† For all tube materials including STA-PURE.

Watson-Marlow 720DuN User Manual 14
Standards
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
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 immunity:
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 A2
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

Watson-Marlow 720DuN User Manual 15
8.1 Dimensions
242mm86mm 180mm
346mm
65mm164mm 186mm
508mm
150mm
658mm
160mm
305mm
280mm
221mm
61mm

Watson-Marlow 720DuN User Manual 16
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. Allow a flow of air
around the pump to ensure that heat can be dissipated. Ensure that the tempera-
ture around the pump does not exceed 40C.
Do not stack other 720 pumps on top of this pump. It is, however, acceptable to
stack other equipment on the upper surface of the 720 (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
difficult 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
counter-clockwise, whichever is convenient.
Tubing materials: run-in advice
Sta-Pure and Marprene tubing are hard to compress when new. When using
tubing made of these materials, the first 30 seconds should be at a speed of 10 rpm
or greater. If the pump is run slower, the safety system built into pump drive’s soft-
ware may cause it to stop and display an over-current error
message.
Connecting pipework
When using elements in a 720RE or 720REX pumphead, ensure that at least 600mm
(2ft) of the connecting pipework rises as it approaches the pumphead on both the
inlet and discharge sides. This helps the sliders which hold the element in place to
find their optimum position. Failure to do this may result in premature element fail-
ure.

Watson-Marlow 720DuN User Manual 17
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 720N 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. When pumping viscous fluids use pipe runs with a bore several
times larger than the pump tube. 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 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.
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. 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.
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.
Do not run the pump with no tube or element fitted to the pumphead. If the direc-
tion is changed, the rotor will continue turning as it tries to reverse and the software
will flag an error condition.

Watson-Marlow 720DuN User Manual 18
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.
The voltage selector is mounted in the switchplate at
the rear of the pump, protected from water by the
720N module. The module must be removed to allow
access to the switchplate. See 22.1 720N 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 volt-
age selector switch before connecting the mains sup-
ply. Make suitable connection to an earthed, single-
phase mains electricity supply. To comply with Safety
Standards, the mains plug must be a separable plug
(not a locking type).
We recommend using commer-
cially available supply voltage
surge suppression where there
is excessive electrical noise.
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.
Conductor coding
European North American
line brown black
neutral blue white
ground green/yellow green

Watson-Marlow 720DuN User Manual 19
The voltage selector switch is not visible while the
720N 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 720N
module removal and replacement.
If the mains power cable is inappropriate for your installation, it can be changed.
Please contact your local Watson-Marlow Bredel service centre.
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 30 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.

Watson-Marlow 720DuN User Manual 20
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 25.1 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.
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 a warning 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 300 rpm, but 360 rpm is available (see 18.13 Set maximum
allowed speed). Other initial start-up operational parameters are listed in the
table below.