REHM BARRACUDA RTC 60 User manual

BARRACUDA RTC 60 / 100 / 150
OPERATING INSTRUCTIONS
Plasma arc cutting
GB

Product Identification
Product Identification
Plasma cutting equipment
BARRACUDA RTC 60
BARRACUDA RTC 100
BARRACUDA RTC 150
Rehm GmbH u. Co. KG
Ottostr. 2
73066 Uhingen, Germany
Telephone: [phone]
Fax: [phone]
e-mail: [e-mail]
Internet: http://www.rehm-online.de
Doc. no.: 730 1200
Issue date: 06/2013
Rehm GmbH u. Co. KG, Uhingen, Germany 2005
The content of this specification is the sole property of the Rehm GmbH u. Co.
KG company.
Dissemination and/or duplication of this document and use and/or communication
of its content are forbidden except where expressly permitted.
Compensation shall be payable in the event of contraventions. All rights reserved
in the event of registration of a patent, utility model or design.
Manufacture using this documentation is not permitted.
We reserve the right to alter the specification without notice.
Designation
Type
Manufacturer

Table of Contents
3
Table of Contents
Product Identification 2
1Introduction 5
1.1 Foreword 5
1.2 General Description 7
1.2.1 Performance features of BARRACUDA cutting equipment 8
1.2.2 Principle of plasma arc cutting 8
1.2.3 Area of application of plasma cutting equipment 9
1.2.4 Function principle of REHM BARRACUDA cutting equipment 9
1.2.5 Proper use 9
1.3 Symbols used 10
2. Safety Instructions 11
2.1 Safety symbols in these operating instructions 11
2.2 Warning symbols on the equipment 11
2.3 General 12
3Description of Function 13
3.1 Preparations for cutting 13
3.1.1 Mains connection and power-up 13
3.1.2 Adjustment of compressed air –gas test 13
3.1.3 Operating modes 13
3.1.3.1 2-step operating mode 13
3.1.3.2 4-step operating mode 13
3.1.4 Choosing the cutting current 13
3.1.5 Nozzle selection 14
3.2 Cutting operation 14
3.2.1 General description 14
3.2.2 The REHM control panel 15
3.2.3 Symbols and their meanings 16
3.2.4 Operating modes 17
3.2.4.1 2-step function sequence 17
3.2.4.2 4-step function sequence 17
3.3 Possible applications 18
3.3.1 Cutting of perforated sheets 18
3.3.2 Hole-piercing 18
3.3.3 Gouging 18
3.3.4 Weld preparation 18
3.3.5 Circle cutting 18
3.4 Machine Functions 19
3.4.1 Gas pre-flow 19
3.4.2 Soft start 19
3.4.3 Quick start 19
3.4.4 Safety shut-down 19
3.4.5 Post-purge gas flow time 19
3.4.6 Safety contact in plasma torch 19
3.4.7 Detection of phase failure 19
4Accessories 20
4.1 Standard Accessories 20
4.2 Options 20
4.2.1 80A torch for RTC 100 and RTC 150 20
4.2.2 Automatic torch 20
4.2.3 Torch accessories 20
4.2.4 Air filter attachment 20
4.2.5 Mechanised interlock 20
4.2.6 Special voltages 21

Table of Contents
4
4.3 Torches and accessories 21
4.3.1 RTC 60 machine configuration 21
4.3.1.1 Standard accessories for RTC 60 21
4.3.1.2 Plasma torches A80 and P80 Aut 22
4.3.2 Machine configuration RTC 100 / RTC 150 23
4.3.2.1 Standard accessories RTC 100 / RTC 150 23
4.3.2.2 Plasma torches R145 and R145P 23
4.3.2.3 Accessories for torch R145 25
4.3.3 Circle cutting equipment and magnet clamps 26
5Commissioning 27
5.1 Safety instructions 27
5.2 Working under increased electrical danger in accordance with the provisions
of IEC 974, EN 60974-1 and VBG 15 (S) 27
5.3 Transport and set-up of the plasma cutting equipment 27
5.4 Connection of the plasma cutting equipment 28
5.5 Cooling of the plasma cutting equipment 28
5.6 Compressed air supply 28
5.7 Guidelines for working with cutting current sources 28
5.8 Connection of workpiece return cables/torch 29
5.9 Recommended cross-sections of welding power supply cables 29
5.10 Connection to jigs 29
6Operation 30
6.1 Safety instructions 30
6.2 Electrical Hazards 30
6.3 Information for your personal safety 31
6.4 Fire Protection 31
6.5 Ventilation 32
6.6 Checks before switching on 32
6.7 Connection of the earthing cable 33
7Faults 34
7.1 Safety instructions 34
7.2 Troubleshooting Table 35
8Maintenance Work 38
8.1 Safety instructions 38
8.2 Maintenance table 38
8.3 Cleaning of equipment interior 39
8.4 Proper waste disposal 39
9Circuit diagrams 40
10 List of Components 43
10.1 Sparepart list REHM RTC 43
11 Mechanised interlocks 48
11.1 RTC units with 7-pin interface (only for RTC 100 and RTC 150) 48
11.2 RTC units with 17-pin interface (only for RTC 100 and RTC 150) 48
11.3 Connection schematic for 7-Pole mechanised cutting interface 49
11.4 Connection schematic for A-pole mechanised cutting interface 50
12 Technical Data 51
13 Index 52

Introduction
5
1 Introduction
1.1 Foreword
Dear customer,
You have purchased a REHM plasma cutting machine, a brand-name
German product. We would like to thank you for the confidence you have
placed in our high quality products.
Only components of the highest quality are used in the development and
manufacture of REHM plasma cutting equipment. In order to achieve a
long life-span even in heavy-duty use, only parts which fulfil REHM’s
stringent quality requirements are used for REHM plasma cutting
equipment. BARRACUDA plasma cutting equipment has been developed
and manufactured in accordance with generally recognised safety and
technical regulations. All the relevant legal requirements have been
observed, and the equipment is supplied with a declaration of conformity
as well as the CE symbol.
REHM plasma cutting equipment is produced in Germany and carries the
"Made in Germany" quality mark.
As REHM tries to make immediate use of technical advances, we reserve
the right to adapt and modify the design of this plasma cutting equipment
to conform with the latest technical requirements.

Introduction
6
except where expressly stated otherwise in writing by REHM, REHM plasma
cutting equipment is only intended for sale to commercial or industrial users and
only for use by such users.
BARRACUDA plasma cutting equipment should only be used
a) for the purpose intended and
b) in a safe condition
REHM plasma cutting equipment may only be operated by personnel trained and
instructed in the use and maintenance of plasma cutting equipment. Only
qualified, authorised and trained staff may work on and with the equipment.
These operating instructions contain important information on the safe, correct
and economic operation of the equipment. A copy of the instructions must be kept
at all times in an appropriate place where the equipment is being used.. Please
make sure that you read the information summarised in this operating manual
before using the equipment. You will gain important information regarding the use
of the equipment which will enable you to use the technical advantages of your
REHM equipment to the full. In addition, you will find details regarding
maintenance and upkeep, as well as operating and functional safety.
These operating instructions are no substitute for training given by REHM service
staff.
The documentation relating to any optional accessories installed must also be
noted.
No alterations to the equipment are permitted, nor are the attachment or
installation of any additional equipment. Such actions will result in cancellation of
any right to make warranty and liability claims.
Warranty rights will also be forfeited if any work is performed on the unit by third
parties or if any safety devices are deactivated.
Areas of
application
Qualifications of
operating
personnel
Purpose of the
document
Alterations to the
equipment

Introduction
7
1.2 General Description
Fig.1 BARRACUDA

Introduction
8
1.2.1 Performance features of BARRACUDA cutting
equipment
Housing in REHM design
Improved ergonomics thanks to systematic and continuing enhancement of
the REHM design. The protected and well thought-out design means that
protection class IP23 is achieved. The equipment can therefore be used for
cutting outdoors.
REHM high-performance transformers
High-performance transformer with double enamelled wire, insulation class H
(180°C).
High-quality enamelled copper wire is used for all transformers.
All transformer windings are wound in layers, with inter-layer insulation.
REHM thermal protection
All REHM equipment is protected against overheating by thermal sensors.
REHM transistor heavy-duty circuit breaker
The patented REHM transistor heavy-duty circuit breaker, proved in tens of
thousands of instances, permits fine control of the cutting current, which is
continuously adjustable. Precise control with voltage compensation means
that cutting current can be held constant for maximum cut quality. The high
duty cycle values of 60% (10 mins.) are achieved safely through use of only
high-grade service components.
REHM safety system
With the monitoring of torches and wearing parts, with active early warning
and automatic safety shutdown aimed at damage prevention, the logic control
system offers the maximum safety for man and equipment.
REHM cost-effectiveness
Because the controlled pilot current is switched off during cutting and a soft
start function is standard, service life is longer and wear and tear is reduced.
Dependable ignition using REHM Zetronik is possible both for contact and
distant cutting. The quick start function permits immediate ignition, even
during the post-purge gas flow time. The post-purge gas flow time is demand-
oriented. Changing a torch on the central connector is simple and quick.
Material-oriented regulation of high-speed pilot and cutting current allows
uninterrupted cutting of perforated sheets.
1.2.2 Principle of plasma arc cutting
In plasma arc cutting operations, the material is melted using a high-energy arc.
In the plasma torch, air or gas is heated to such high temperatures that an
electrically conductive plasma is produced. The plasma issues from a nozzle as a
concentrated jet at high speed and thus forms the contact between electrode and
workpiece. The high energy density of the jet melts the material to be cut and
simultaneously blows it out of the kerf.

Introduction
9
1.2.3 Area of application of plasma cutting equipment
BARRACUDA cutting machines are direct-current sources. All conductive metals
can be cut using plasma arc cutting. The maximum material thickness to be cut in
each case depends on the arc power of the current source, the type of material
and the cutting speed used.
1.2.4 Function principle of REHM BARRACUDA cutting
equipment
All REHM BARRACUDA cutting equipment is continuously adjustable. This
means that it is possible for the user to quickly adapt it to the specific cutting
tasks. The cutting arc is extremely stable within broad limits thanks to internal
regulation of current. Fluctuations in the power supply are compensated in the
range between +6% and -10%.
High performance reserves guarantee the optimum material penetration and
constant cutting performance even under extreme requirements.
With REHM BARRACUDA cutting equipment both contact and distant cutting is
possible. In the case of contact cutting, however, the cutting current should not
exceed 50A.
In the development and design of this equipment, the priorities were the best
cutting characteristics, high efficiency, low wear and tear and simple operation
and handling.
All the components were tested extensively under practical conditions for heavy-
duty and industrial usage.
1.2.5 Proper use
REHM plasma cutting equipment is designed to cut all conductive metals. Please
note also any special regulations which may apply to your application. Please
contact your safety officer or REHM Customer Service if you have any queries.
Except where expressly stated otherwise in writing by REHM, REHM plasma
cutting equipment is only intended for sale to commercial or industrial users and
only for use by such users. It must be operated only by people who have been
trained and are qualified in the use and maintenance of plasma cutting
equipment.
Cutting current sources must not be positioned in areas where there is a
significant electrical hazard see Chapter 5, Commissioning.
These operating instructions contain rules and guidelines for the proper use of
your equipment. Only use in accordance with these operating instructions will be
deemed to be proper use. Any risks which arise from other forms of use are the
responsibility of the operator. For special requirements, it may be necessary to
observe special additional conditions as well.
Please contact your safety officer or REHM Customer Service if you have any
queries.
Attention should be paid to the specific directions regarding proper use referred to
in the delivery documentation.
Any national regulations which are more stringent than the requirements of these
operating instructions also apply.

Introduction
10
Proper use also includes compliance with the specified conditions for installation,
dismantling, re-installation, commissioning, operation, maintenance and disposal
measures. Please heed in particular the information in the chapter on safety.
The equipment may be operated only under the above-mentioned conditions. Any
other form of use is deemed as not being proper use. The operator will be liable
for any consequences arising from improper use of the equipment.
1.3 Symbols used
Lists preceded by bullet point: general list
Lists preceded by square: working or operating steps which must be carried
out in the order listed.
Section 2.2, Warning symbols on the equipment
Cross-reference: in this case to Section 2.2, Warning symbols on the
equipment
Bold type is used for emphasis
Note:
... Indicates user tips and other particularly useful information.
For the safety symbols used in this manual, Section 2.1.
Typographical
conventions
Safety symbols

Safety Instructions
11
2. Safety Instructions
2.1 Safety symbols in these operating instructions
You will find this symbol or one which specifies the danger more precisely
by all safety instructions in these operating instructions where there is a
risk to life and limb.
One of the following words (Danger!, Warning!, Caution!) indicates the
extent of the hazard:
Danger! ... There is an immediate danger.
If the hazard is not avoided, then death or serious injury will occur.
Warning! ... There is the possibility of a dangerous situation.
If the danger is not avoided, then death or serious injury could occur.
Caution! ... There is the possibility of a harmful situation.
If this is not avoided, light or minor injury could occur and damage could
be caused to property.
Important!
Reference to a possibly harmful situation. If it is not avoided, then the
product or something in the vicinity may be damaged.
Substances which are injurious to health and/or the environment. Materials
/ fuels which have to be handled and/or disposed of in accordance with
legislation.
2.2 Warning symbols on the equipment
indicate hazards and sources of danger on the equipment.
Danger!
Dangerous electrical voltage!
Disregarding the danger can lead to death or injury.
Warnings and
symbols

Safety Instructions
12
2.3 General
The equipment was designed and manufactured in accordance with generally
recognised technical regulations.
Nevertheless, risks of personal injury to the user or third parties or damage to the
equipment or to other material assets could arise during use.
Under no circumstances may any safety mechanisms be dismantled or taken out
of service, as this will result in exposure to danger and proper use of the
equipment is no longer guaranteed.
Dismantling of safety mechanisms during set-up, repair and maintenance is
described separately. Immediately after this work has been completed, the safety
mechanisms must be re-installed.
The operator of the equipment must ensure its safety during the use of external
agents (e.g. solvents for cleaning).
All safety and warning notices and the nameplate on the equipment must be kept
in a legible condition and must be heeded.
Safety instructions are intended to promote occupational health and safety and
prevent accidents. They must be observed.
It is important to observe not only the safety instructions listed in this chapter but
also the special safety instructions given throughout these operating instructions.
In addition to the instructions in these operating instructions, general safety and
accident prevention regulations (in Germany among others UVV VGB15 on
welding, cutting and associated processes, especially the references to arc
welding and cutting, or the appropriate national regulations) must also be
observed.
Please observe the safety notices in the operator’s workshop as well.
Dangers of
disregarding safety
instructions
Safety
instructions

Description of Function
13
3 Description of Function
3.1 Preparations for cutting
3.1.1 Mains connection and power-up
REHM cutting equipment is fitted with a Euro CEE plug for 3x400V three-phase
alternating current. The equipment is connected to the power supply voltage via
the main switch on the front side. The control lamp MAINS ON shows that the
equipment is ready for operation.
3.1.2 Adjustment of compressed air –gas test
The pressure and the flow rates for cooling and cutting air must in each case be
appropriately adjusted to the torch used. If the gas pressure is incorrectly set,
cutting quality will be reduced, wear and tear will be higher and, under extreme
conditions, the torch could be destroyed. The necessary air pressure must be
adjusted using the adjustment knob provided for this purpose on the control
panel.
To do so, turn the function selection switch to the “GAS TEST” position and pull
the blue adjustment knob upwards. Continue turning in this position until the
pressure displayed on the pressure gauge corresponds exactly to the required air
pressure. Then push the rotary knob back down to lock it. The setting is now
protected against inadvertent adjustment. After that, to begin cutting operation,
switch the function selection switch back to 2-step or 4-step operating mode.
3.1.3 Operating modes
3.1.3.1 2-step operating mode
In this operating mode, the torch button is kept pressed down throughout cutting
until cutting is terminated. Releasing the torch button terminates the cutting
operation, just as does extinguishing of the arc.
This operating mode is recommended for short, alternating cutting operations.
3.1.3.2 4-step operating mode
After ignition of the cutting arc, the torch button can be released. Reactivation and
release of the torch button terminates the cutting operation, just as does
extinguishing of the arc.
In this operating mode, it is possible to operate the torch effortlessly for extended
periods.
3.1.4 Choosing the cutting current
The current required depends essentially on the type of material to be cut and on
the material thickness Continuous adjustment of the cutting current supplied to
REHM BARRACUDA cutting equipment permits optimum adjustment to particular
cutting tasks.
If the current is set too high, this will lead to higher wear and tear of nozzle and
torch electrode. If the current is set too low, then either no material penetration
occurs or else this is too slow.

Description of Function
14
3.1.5 Nozzle selection
A plasma nozzle that is appropriate to the cutting current setting must be
selected. If the nozzle is too big, cutting performance is impeded, while too small
a nozzle will cause thermal overload and hence higher wear and tear.
To make the correct choice of nozzle, the areas of application of the various
nozzle diameters are shown on the cutting current adjustment dial.
Only replace parts with original REHM spare parts (see Chapter 4).
3.2 Cutting operation
3.2.1 General description
To achieve an optimal cutting quality, the choice of cutting current, nozzle and
cutting speed must take into account the type of material to be machined and the
thickness of the work piece.
Where light gauge sheet metal is to be cut, better cutting quality is achieved when
the torch is in contact with the material.
If thick sheets are to be cut, higher cutting performance is needed. Therefore
cutting must be performed with the torch held at a distance. The relevant spacer
elements will be found in the appendix entitled “Torches and accessories”.
In hand cutting operations, the quality of the cut and the amount of wear and
tear sustained by the torch components depends not only on the factors already
mentioned, but also on the skill of the user in handling the plasma torch.
Press torch button and move torch with pilot arc to the point at which the cut is to
start.
Following ignition of the cutting arc, draw the torch across the work piece at a
constant speed. The optimal cutting speed is achieved when the cutting jet is
facing towards the direction of cut and is inclined at approx. 10º from the kerf.
The pilot arc should not be ignited unnecessarily, as this will result in higher wear
and tear of the torch components.
With straight cuts, it is recommended using a stop rail to guide lateral movement
of the torch. To obtain even and stick-slip free movement of the torch, we
recommend using a torch carriage (see Chapter 4).

Description of Function
15
3.2.2 The REHM control panel
The plasma cutting equipment is operated using the REHM control panel shown
in Fig. 3.1.
Figure 3.1 Control panel on the BARRACUDA RTC 150 (RTC 60 and RTC 100
layouts are similar)
The control panel is divided into the following areas:
Measuring instruments for the compressed air setting
Cutting current selection knob
Rotary knob for compressed air setting
Control lamps
Function selection switch 2-step, 4-step, gas test
730 0178
1,2
40
50
60
70
80 90 100
110
120
130
140
150
30
25
60
50
40
30
25
R145
A80
5,0-5,5 BAR ( A80 / R145 )
72,5-79,75 psi
150

Accessories
16
3.2.3 Symbols and their meanings
The symbols used on the control panel have the following meanings:
The cutting equipment is currently in 2-step cutting mode (see Section 3.2.4.1).
The cutting equipment is currently in 4-step cutting mode (see Section 3.2.4.2).
The cutting equipment is set to gas test. By pulling upwards and then turning
the blue adjustment knob, it is possible to set the required air pressure using
the pressure gauge (see Section 3.1.2).
Blue adjustment knob used to set the required air pressure. To do so, pull the
adjustment knob upwards and continue turning in this position until the
pressure displayed on the pressure gauge corresponds exactly to the required
air pressure (see Section 3.1.2).
Recommended range of adjustment on the current scale, using an electrode
diameter of 1.4 mm (the symbol is modified appropriately with other sizes).
R145
Current scale for torches R145 and R145P (see Section 4.3.2.2, “Machine
configuration”).
A80
Current scale for torch A80 (see Section 4.3.1.2, “Machine configuration”).
Control lamps
Wear and tear on the torch parts is displayed as follows:
Flashing: Early warning of increased level of wear and tear. It is
recommended that the wear parts are changed.
Continuous: Wear has exceeded permitted limits. Equipment will shut down.
The point in time at which the wear parts are changed is determined by the user.
There is a voltage at the torch. The pilot current is active, or following ignition of
the cutting arc the set cutting current is flowing.
The air pressure is no longer sufficient to supply the torch.
Equipment will shut down.
The cutting equipment has shut down due to excessive temperature. After it
has cooled down, the cutting equipment automatically reverts to operating
mode.
When heavily loaded, especially when cutting work takes place in a hot
environment, the overtemperature protection can switch off the welding current.
This is indicated by the control lamp.
Power supply voltage switch is switched on, power supply voltage is on (only
with RTC 60).

Accessories
17
3.2.4 Operating modes
3.2.4.1 2-step function sequence
Step 1 - Press torch button
Gas pre-flow time 4 seconds.
Pilot arc is ignited.
On contact with work piece, the cutting arc is ignited and the compressed air
is increased to the required throughput rate.
If contact is not made with the work piece within four seconds, the equipment
switches itself off automatically (safety shutdown).
Step 2 - Release torch button
Cutting current is interrupted, cutting voltage is switched off.
Post-purge gas flow time (demand-oriented).
If the torch button is pressed once again during the post-purge gas flow time,
no gas pre-flow will occur. Functional sequence is immediately restarted
(quick start).
3.2.4.2 4-step function sequence
Step 1 - Press torch button
Gas pre-flow time 4 seconds.
Pilot arc is ignited.
On contact with work piece, the cutting arc is ignited and the compressed air
is increased to the required throughput rate.
If contact is not made with the work piece within four seconds, the
equipment switches itself off automatically (safety shutdown).
Step 2 - Release torch button
- Prior to ignition of the cutting arc
Equipment switches to the basic setting (safety shut-down).
- After ignition of the cutting arc
Cutting operation is resumed.
If the torch is withdrawn during cutting, the arc is extinguished. This has the
effect of interrupting the cutting current and the equipment shuts down. This
function corresponds to the fourth step.
Step 3 - Press torch button
Cutting operation is resumed.
Step 4 - Release torch button
Cutting current is interrupted, cutting voltage is switched off.
Post-purge gas flow time (demand-oriented).
If the torch button is pressed once again during the post-purge gas flow time,
no gas pre-flow will occur. Functional sequence is immediately restarted
(quick start).

Accessories
18
3.3 Possible applications
3.3.1 Cutting of perforated sheets
Interrupted cuts, for example, cutting of perforated sheets, gratings etc., can only
be carried out in “2-step” operating mode. The functional sequence is identical to
the sequence involved in “2-step” mode up to beginning of the hole.
Moving towards the beginning of the hole:
Cutting current interrupted and/or cutting arc extinguished.
Compressed air is reduced.
Pilot current flowing / pilot arc active.
Moving towards the end of the hole:
When contact with material is resumed, the cutting arc is ignited and the
compressed air increases.
If contact is not made with the work piece within four seconds, the equipment
switches itself off automatically (safety shutdown).
3.3.2 Hole-piercing
Place torch obliquely across the work piece and ignite. Then slowly move the
torch to a vertical position until the material is penetrated.
Since during hole-piercing the molten spray can be released from the
material before the arc has penetrated the full material thickness, the
torch nozzle is particularly highly stressed due to splash back of the
material and thermal reflex reflection.
If the material is too thick, it is recommended to drill an appropriately
sized through-hole in advance so that it is possible for the material to
flow.
3.3.3 Gouging
Hold torch at an appropriate slant depending on the desired depth of penetration
and move it forwards in the direction of the molten material. This will then be
blown out of the groove as a result of the plasma pressure.
Depending on the type of seam preparation or machining desired, various
nozzles and/or torch configurations can be used for gouging (see Chapter 4).
3.3.4 Weld preparation
Move torch with appropriate nozzle (see Chapter 4) out of the vertical position
towards the side until the deviation corresponds to the desired angle of the
chamfer. Maintain position and move torch with even, adjusted speed.
3.3.5 Circle cutting
Use of the circle cutting jig is recommended here in combination with the carriage
(see Chapter 4).

Accessories
19
3.4 Machine Functions
3.4.1 Gas pre-flow
A gas pre-flow occurs prior to the start of cutting. This avoids inadvertent ignition
of the pilot arc (safety). Moreover, it also means that the torch bundle is flushed
thoroughly and ensures even with unusually long hose bundles that the volume of
air needed for cutting is available to the torch. The predetermined time is four
seconds. This pre-flow time can be shortened using the quick start function.
3.4.2 Soft start
REHM BARRACUDA cutting equipment is equipped with a soft start function. On
ignition of the cutting arc, the cutting current is raised steadily to the pre-set value.
This increases the service life of the torch's wear parts.
3.4.3 Quick start
The gas pre-flow time can be reduced by pressing twice on the torch button. This
function makes it possible to start a work sequence rapidly. During the post-purge
gas flow time, pressing the torch button once is sufficient to interrupt the post-flow
time and immediately resume cutting operation.
3.4.4 Safety shut-down
If no cutting current arrives within four seconds when the pilot arc is on, the
equipment shuts down automatically. This avoids undue wear and tear on the
torch.
3.4.5 Post-purge gas flow time
To cool the torch sufficiently, the gas continues to flow after the end of cutting.
The post-purge gas flow time is based in a demand-oriented manner on the
cutting performance available during the cutting operation, divided into stages of
32, 64 or 96 seconds. If the torch button has been activated, but no cutting
operation occurred, the post-purge gas flow time is set to 12 seconds.
Important!
Under no circumstances should the equipment be shut down before the
post-purge gas flow time has finished, as otherwise the torch components
will not be adequately cooled.
3.4.6 Safety contact in plasma torch
All torches are fitted with a safety contact which only permits functioning to
commence if the torch is assembled in the proper manner. When wear parts are
changed, the contact is automatically interrupted for safety reasons so that cutting
operations cannot resume.
3.4.7 Detection of phase failure
REHM BARRACUDA cutting equipment is provided with automatic phase failure
detection. This prevents the equipment from being overloaded as a result of the
failure of one phase of the supply voltage. Depending on which phase fails, either
the green MAINS ON control lamp goes out and the equipment cannot be made
to work, or else, on ignition of the pilot arc, the power component switches off
again immediately (one can tell that this has occurred because the power
contactor pulls in and is then immediately released).

Accessories
20
4 Accessories
4.1 Standard Accessories
1 earthing cable with terminal (4m)
1 mains cable with connector (5m)
1 mono-gas plasma torch with central connector and safety switch (6m)
1 set of operating and functional instructions
1 set of wear parts (see appendix, “Torches and accessories”)
4.2 Options
4.2.1 80A torch for RTC 100 and RTC 150
Optional 60A torches enabling cutting of light gauge sheet metal with a smaller
nozzle are also available for the RTC 100 and RTC 150 units. From the coding of
the torch, the equipment can tell that an 80A torch has been connected. The
cutting current is automatically limited to 60A. The inside scale then applies to the
cutting current settings.
The permitted equipment duty cycle is based under this combination on the
maximum duty cycle of the 80A torch (see Section 4.3).
4.2.2 Automatic torch
Appropriate automatic torches can be employed for automated operations, e.g.
on cutting machines. The specification details will be found in Section 4.3.
When an automatic torch is used, a mechanised interlock may be necessary.
Please contact your supplier for further information about this.
4.2.3 Torch accessories
Details of accessories for the various types of torch will be found in Section 4.3.
4.2.4 Air filter attachment
If the REHM BARRACUDA cutting equipment is used in an environment in which
the air is heavily polluted, then use of an air filter attachment is recommended.
This consists of a protective frame and a filter unit which is very easy to replace
when heavily clogged. The air filter attachment can be retrofitted without difficulty.
4.2.5 Mechanised interlock
For automated use of the BARRACUDA equipment, an interface can be provided,
the signals of which are metallically separated.
Outputs: - Current-flowing message (CFL) for message “Cutting arc on”
- Group alarm
- Arc voltage (U) (e.g. for arc voltage height control)