BUSCH R5 ATEX User manual

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Instruction Manual
R5 ATEX
Oil-Lubricated Rotary Vane Vacuum Pumps
RA 0400 C, RA 0502 C, RA 0630 C
RC 0400 C, RC 0502 C, RC 0630 C
0870572240/-0011_en / Original instructions / Modifications reserved 23/03/2021
Ateliers Busch S.A.
Zone industrielle, 2906 Chevenez
Switzerland

Table of Contents
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Table of Contents
1 Safety .......................................................................................................................................4
2 Product Description ..................................................................................................................5
2.1 Operating Principle .......................................................................................................... 6
2.2 Application....................................................................................................................... 6
2.3 Start Controls ................................................................................................................... 7
2.4 Accessories....................................................................................................................... 7
2.4.1 Gas Ballast Valve ................................................................................................... 7
2.4.2 Inlet Filter ..............................................................................................................7
2.4.3 Water-oil Heat Exchanger ..................................................................................... 7
2.4.4 Temperature Switch ..............................................................................................7
2.4.5 Resistance Thermometer ....................................................................................... 7
2.4.6 Level Switch .......................................................................................................... 7
2.4.7 Pressure Switch .....................................................................................................7
2.4.8 Pressure Transmitter ..............................................................................................8
2.5 Explanation of ATEX Classification.................................................................................... 8
2.6 Safety concept ................................................................................................................. 8
2.6.1 ATEX Classifications and Associated Accessories .................................................... 8
2.6.2 P&ID "Piping and Instrumentation Diagram" ........................................................9
3 Transport ..................................................................................................................................10
4 Storage .....................................................................................................................................11
5 Installation................................................................................................................................11
5.1 Installation Conditions...................................................................................................... 11
5.2 Connecting Lines / Pipes .................................................................................................. 12
5.2.1 Suction Connection ............................................................................................... 13
5.2.2 Discharge Connection ...........................................................................................13
5.2.3 Cooling Water Connection (Optional) ...................................................................14
5.3 Earth Connection ............................................................................................................. 15
5.4 Filling Oil.......................................................................................................................... 16
5.5 Fitting the Coupling ......................................................................................................... 16
5.6 Electrical Connection ........................................................................................................ 17
5.6.1 Wiring Diagram Three-Phase Motor......................................................................18
5.7 Electrical Connection of the Monitoring Devices............................................................... 19
5.7.1 Wiring Diagram Temperature Switch.....................................................................19
5.7.2 Wiring Diagram Resistance Thermometer.............................................................. 19
5.7.3 Wiring Diagram Pressure Switch............................................................................20
5.7.4 Wiring Diagram Pressure Transmitter..................................................................... 20
5.7.5 Wiring Diagram Level Switch................................................................................. 20
5.7.6 Wiring Diagram Pressure Switch of Water-oil Heat Exchanger (Optional).............. 21
5.8 Flowchart ......................................................................................................................... 22
6 Commissioning.........................................................................................................................23
6.1 Conveying Condensable Vapours..................................................................................... 24
7 Maintenance.............................................................................................................................24
7.1 Maintenance Schedule ..................................................................................................... 25
7.2 Oil Level Inspection.......................................................................................................... 26
7.3 Oil and Oil Filter Change.................................................................................................. 26
7.4 Exhaust Filter Change....................................................................................................... 28
7.5 Coupling Maintenance ..................................................................................................... 29
7.6 Air Heat Exchanger Cleaning............................................................................................ 29

Table of Contents
0870572240_RA0400-0630C_Ex_-0011_IM_en 3
8 Overhaul...................................................................................................................................30
9 Decommissioning.....................................................................................................................31
9.1 Dismantling and Disposal ................................................................................................. 31
10 Spare Parts................................................................................................................................31
11 Troubleshooting .......................................................................................................................32
12 Technical Data..........................................................................................................................34
13 Oil ............................................................................................................................................35
14 EU Declaration of Conformity...................................................................................................36

1 | Safety
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1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If
anything needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything
on the product.
The machine is intended for industrial use. It must be handled only by technically trained
personnel.
Always wear appropriate personal protective equipment in accordance with the local
regulations.
The machine has been designed and manufactured according to state-of-the-art meth-
ods. Nevertheless, residual risks may remain. This instruction manual highlights potential
hazards where appropriate. Safety notes and warning messages are tagged with one of
the keywords DANGER, WARNING, CAUTION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if
not prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

Product Description | 2
0870572240_RA0400-0630C_Ex_-0011_IM_en 5 / 40
2 Product Description
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
NOTE
Illustrations
In this instruction manual the illustrations may differ from the machine appearance.
NP OS EB
IN
OUT
OF
ODP OSG
MTB
GB
TSA or
TS+0101
PSA or
PS+0301
OFP
IF ECI
AF
AHE
DA
FV
FV
MTB DAAHE
TSA or
TS+0102
RA 0400 C /
RA 0502 C
RA 0400 C (60 Hz) / RA 0502 C
RA 0630 C
RA 0400 C - RA 0630 C
ECP
EF FM
two positions are possible
two positions are possible
TSA+0104
or TS+0104
LS-0201
IN Suction connection MTB Motor terminal box
OUT Discharge connection DA Directional arrow
OFP Oil fill plug EF Exhaust filter
OSG Oil sight glass NP Nameplate
ODP Oil drain plug OF Oil filter
EB Eye bolt AF Axial fan
GB Gas ballast valve OS Oil separator

2 | Product Description
6 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
AHE Air-oil heat exchanger FM Filter material
FV Float valve (on RA version only) TS Temperature switch
TSA Resistance thermometer PS Pressure switch
PSA Pressure transmitter LS Level switch
IF Inlet filter ECP Pump earth connection
ECI Inlet filter earth connection
2.1 Operating Principle
The machine works on the rotary vane principle.
The oil seals the gaps, lubricates the vanes and takes away compression heat.
The oil filter cleans the circulating oil.
Exhaust filters separate the oil from the discharged gas.
2.2 Application
The machine is intended for the suction of air and other dry, non-aggressive and non-
toxic gases.
Explosive gases and vapour mixtures can be drawn according to the scope of the Direct-
ive ATEX 2014/34/EU.
Depending on the equipment, the machine is intended for suction of explosive gases
and/or dusts according to the data given on the nameplate of the machine (NP), see Ex-
planation of ATEX Classification [►8].
Conveying of other media leads to an increased thermal and/or mechanical load on the
machine and is permissible only after a consultation with Busch.
The machine is intended for the placement in a potentially explosive environment ac-
cording to the data given on the nameplate of the motor and the nameplate of the ma-
chine (NP), see Explanation of ATEX Classification [►8].
The machine is designed for indoor installation, in case of outdoor installation, ask your
Busch representative in order to take specific precautions.
In case Busch delivered the machine without motor and coupling, the following must be
observed:
• In regards to its explosive atmosphere protection class, the motor and the coup-
ling must have at least the same ATEX classification as the machine for the outside
area “Outside (o)”.
• The motor and the coupling do not require an ATEX certification when the ma-
chine ATEX classification corresponds to “Outside (o) No ATEX zone”.
The machine is capable of maintaining ultimate pressure, see Technical Data [►34].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►34].

Product Description | 2
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2.3 Start Controls
The machine comes without start controls. The control of the machine is to be provided
in the course of installation.
The machine can be optionally equipped with a starter unit or a variable-frequency drive.
2.4 Accessories
NOTE
Depending on the ATEX classification of the machine, some of the following accessories
may be mandatory, see ATEX Classifications and Associated Accessories [►8].
2.4.1 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to
counteract the condensation of vapour inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Tech-
nical Data [►34].
2.4.2 Inlet Filter
The inlet filter protects the machine against dust and other solids in the process gas. The
inlet filter is available with a polyester (antistatic) cartridge.
2.4.3 Water-oil Heat Exchanger
In case of unfavourable ambient conditions a water-oil heat exchanger can be provided.
See Cooling Water Connection (Optional) [►14].
2.4.4 Temperature Switch
The temperature switch monitors the gas and the oil temperature of the machine.
The machine must be stopped when the gas and/or the oil reach a certain temperature,
see Wiring Diagram Temperature Switch [►19].
2.4.5 Resistance Thermometer
The resistance thermometer monitors the gas temperature of the machine and optionally
the oil temperature.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer
[►19].
2.4.6 Level Switch
The level switch monitors the oil level.
The machine must be stopped when the oil level is too low.
2.4.7 Pressure Switch
The pressure switch monitors the pressure in the oil separator.
The machine must be stopped when the gas reaches a certain pressure, see Wiring Dia-
gram Pressure Switch [►20].

2 | Product Description
8 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
2.4.8 Pressure Transmitter
The pressure transmitter monitors the pressure in the oil separator.
Warning and trip signals must be set, see Wiring Diagram Pressure Transmitter [►20].
2.5 Explanation of ATEX Classification
The ATEX classification is written on the nameplate of the machine (NP), see below a
marking example:
Inside (i)
Outside (o)
II 2G / 3D Ex h IIB T3 Gb / IIIC 80°C Dc X
II 2GD Ex h IIB T4 Gb / IIIC 130°C Db X
Explosion group inside the machine
Equipment category for explosive gases inside the machine
Equipment category for gas and dust outside the machine
Equipment group II (not for mining application)
Explosion protection inside the machine
Explosion protection outside the machine
Design approved
according to ATEX Directive
Equipment group II (not for mining application)
Temperature class inside the machine (T3=200°C)
Temperature class outside the machine (T4=135°C)
Max. temperature for surfaces in contact with dust
Equipment category for explosive dust
Type of protection
Type of protection
Explosion group outside the machine
Equipment protection level gas
Dust explosion group inside the machine
Equipment protection level dust
Max. temperature for surfaces in contact with dust
Equipment protection level dust
Dust explosion group outside the machine
Special conditions for operation*
Special conditions for operation*
Equipment protection level gas
* The specific operating conditions are determined by the type of oil used in the ma-
chine which will limit the max. allowable ambient temperature, see Technical Data
[►34].
2.6 Safety concept
The safety concept is based on the prevention of sparks and excessive temperatures by
means of various accessories.
The monitoring devices must be integrated into the system control such that operation
of the machine will be inhibited if the safety limit values are exceeded.
The limit values of each accessory are defined in the wiring diagram chapters, see Elec-
trical Connection of the Monitoring Devices [►19].
To have more details about the monitoring procedure, see Flowchart [►22].
2.6.1 ATEX Classifications and Associated Accessories
WARNING
Any confusion between the two possible ATEX temperature classes.
Risk of severe injury!
Risk of explosion!
• Be aware that the machines RA/RC 0400 C and RA/RC 0502 C are certified T3(i/o)
and the machine RA/RC 0630 C is certified T3(i) / T4(o).
The following table defines the obligatory accessories depending on the ATEX classifica-
tion.

Product Description | 2
0870572240_RA0400-0630C_Ex_-0011_IM_en 9 / 40
(i) II 2G/3D Ex h IIB T3 Gb / IIIC 80°C Dc X
ATEX
IF
TSA /
TS+0101
PSA /
PS+0301
ATEX
MOT
ATEX
CPL
ATEX
EF ECP ECI
XX
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
XX XX
XX
E
A
B
C
DX
(i) II 2G Ex h IIB T3 Gb X
(o) No ATEX Zone
(i) II 3D Ex h IIIC 80°C Dc X
(o) No ATEX Zone
(i) II 2G Ex h IIB T3 Gb X
(o) II 2G Ex h IIB T4 Gb X
or (o) II 2G Ex h IIB T3 Gb X
(i) II 2G Ex h IIB T3 Gb X
(o) II 2GD Ex h IIB T4 Gb / IIIC 130°C Db X
or (o) II 2GD Ex h IIB T3 Gb / IIIC 150°C Db X
(o) II 2GD Ex h IIB T4 Gb / IIIC 130°C Db X
or (o) II 2GD Ex h IIB T3 Gb / IIIC 150°C Db X
ATEX classification
IF Inlet filter TSA Resistance thermometer
TS Temperature switch PSA Pressure transmitter
PS Pressure switch MOT Motor
CPL Coupling EF Exhaust filter
ECP Pump earth connection ECI Inlet filter earth connection
2.6.2 P&ID "Piping and Instrumentation Diagram"
M
PSA+
0301
0201
LS- PS+
0301
TSA+
0104
TSA+
0101
TS+
0101
M
PSA+
0301
0201
LS- PS+
0301
TSA+
0104
TSA+
0101
TS+
0101
IF
M
IF
TSA+
0102
TS+
0102
TSA+
0102
TS+
0102
TSA+
0101
TS+
0101
Optional
Optional
or
or
P&ID for classification B , C and E
P&ID for classification A P&ID for classification D
Optional
Optional
or
or
Optional
Optional
or
or
or

3 | Transport
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3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
WARNING
Lifting the machine using the motor eye bolt.
Risk of severe injury!
• Do not lift the machine using the eye bolt fitted to the motor. Only lift the machine as
shown.
NOTICE
In case the machine is already filled with oil.
Tilting a machine that is already filled with oil can cause large quantities of oil to in-
gress into the cylinder. Starting the machine with excessive quantities of oil in the
cylinder will immediately break the vanes and ruin the machine!
• Drain the oil prior to every transport or always horizontally transport the machine.
• Make sure that the eyebolt(s) (EB) is/are in faultless condition, fully screwed in and
tightened by hand.
Machine weight:
see the technical data or the nameplate (NP)
• Check the machine for transport damage.
If the machine is secured to a base plate:
• Remove the machine from the base plate.

Storage | 4
0870572240_RA0400-0630C_Ex_-0011_IM_en 11 / 40
4 Storage
• Seal all apertures with adhesive tape or reuse provided caps.
Version with water-oil heat exchanger:
• Make sure that the cooling water has been completely removed, see Decommis-
sioning [►31].
If the machine is to be stored for more than 3 months:
• Wrap the machine in a corrosion inhibiting film.
• Store the machine indoors, dry, dust free and if possible in original packaging
preferably at temperatures between 0 ... 40 °C.
5 Installation
5.1 Installation Conditions
WARNING
The installation conditions are not respected in an ATEX environment.
Risk of severe injury!
Risk of explosion!
• Take care that the installation conditions are met.
NOTICE
Use of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
• Take care that the installation conditions are fully complied with.
~50 cm
~50 cm
~100 cm
~100 cm
• Make sure that the environment of the machine complies with the ATEX classification
of the machine according to the data given on the nameplate of the motor and the
nameplate of the machine (NP).
• Make sure that the ambient conditions comply with the Technical Data [►34].
• Make sure that the environmental conditions comply with the protection class of the
motor and the electrical instruments.

5 | Installation
12 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
• Make sure that the installation space or location is vented such that sufficient cooling
of the machine is provided.
• Make sure that cooling air inlets and outlets are not covered or obstructed and that
the cooling air flow is not affected adversely in any other way.
• Make sure that the oil sight glass (OSG) remains easily visible.
• Make sure that enough space remains for maintenance work.
• Make sure that the machine is placed or mounted horizontally, a maximum of 1° in
any direction is acceptable.
• Check the oil level, see Oil Level Inspection [►26].
• Make sure that all provided covers, guards, hoods, etc. are mounted.
Version with water-oil heat exchanger:
• Make sure that the cooling water complies with the requirements, see Cooling
Water Connection (Optional) [►14].
If the machine is installed at an altitude greater than 1000 meters above sea level:
• Contact your Busch representative, the motor should be derated or the ambient
temperature limited.
Make sure that the monitoring devices are correctly connected and integrated into a
control system such that operation of the machine will be inhibited if the safety limit val-
ues are exceeded, see Electrical Connection of the Monitoring Devices [►19].
If additional electrical components not included in scope of delivery should be added:
• Make sure that they have a better or equal ATEX classification than that of the
machine, see the ATEX marking on the nameplate (NP).
For classification type “C” and “D” (see ATEX Classifications and Associated Accessor-
ies [►8]):
• Make sure that the installation space or location is ventilated enough in order to
prevent the formation of an explosive area.
5.2 Connecting Lines / Pipes
WARNING
The connection lines can build up an electrostatic charge.
Risk of severe injury!
Risk of explosion!
• The connection lines must be made out of conductive material or provisions must be
made against creating an electrostatic charge.
• Remove all protective covers before installation.
• Make sure that the connection lines cause no stress on the machine‘s connection; if
necessary use flexible joints.
• Make sure that the line size of the connection lines over the entire length is at least as
large as the connections of the machine.
In case of long connection lines it is advisable to use larger line sizes in order to avoid a
loss of efficiency. Seek advice from your Busch representative.

Installation | 5
0870572240_RA0400-0630C_Ex_-0011_IM_en 13 / 40
5.2.1 Suction Connection
WARNING
Unprotected suction connection.
Risk of severe injury!
• Do not put hand or fingers in the suction connection.
NOTICE
Ingress of foreign objects or liquids.
Risk of damage to the machine!
If the inlet gas contains dust or other foreign solid particles:
• Install a suitable filter (5micron or less) upstream from the machine.
Connection size(s):
– G3
Depending on the specific order, other connection dimensions may apply.
If the machine is used as part of a vacuum system:
• Busch recommends the installation of an isolation valve in order to prevent the oil
from flowing back to the vacuum system.
5.2.2 Discharge Connection
CAUTION
The discharge gas contains small quantities of oil.
Risk to health!
If air is discharged into rooms where persons are present:
• Make sure that sufficient ventilation is provided.
Connection size(s):
– G3
Depending on the specific order, other connection dimensions may apply.
• Make sure that the discharged gas will flow without obstruction. Do not shut off or
throttle the discharge line or use it as a pressurised air source.
Unless the aspirated air is discharged to the environment right at the machine:
• Make sure that the discharge line either slopes away from the machine or provide a li-
quid separator or a siphon with a drain cock, so that no liquids can flow back into the
machine.

5 | Installation
14 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
5.2.3 Cooling Water Connection (Optional)
Water-oil heat exchanger without inlet accessories
Water-oil heat exchanger with inlet accessories
(Available for all ATEX classifications)
(Only available for ATEX classifications C andD )
WHE CWO CWI
CWO TV PS
MV WF CWIWHE
WBV
CWI Cooling water inlet PS Pressure switch
CWO Cooling water outlet WBV Water bypass valve
WHE Water-oil heat exchanger WF Water filter
TV Thermostatic valve MV Solenoid valve
The thermostatic valve (TV) is used to control the water flow in order to keep a stable
machine temperature.
The factory default adjustment of the thermostatic valve (TV) is set in position 2 (approx.
75°C oil temperature).
The pressure switch (PS) is used to monitor the presence of water at the cooling system
of the machine.
When the pressure switch detects a pressure lower than 2 bar, the machine must be
stopped.
The water bypass valve (WBV) is used at the first machine start-up. At that moment it
should be open (approx. 90 seconds) to prime the water heat exchanger, afterwards it
should be closed.
The solenoid valve (MV) is used to stop the cooling water circulation when the machine
is not running.
• Connect the cooling water connections (CWI / CWO) to the water supply.
Connection size:
– 19 mm hose (CWI / CWO)
• If necessary, electrically connect the pressure switch (PS), see Wiring Diagram Pres-
sure Switch of Water-oil Heat Exchanger (Optional) [►21].
• If necessary, electrically connect the solenoid valve (MV).
• Make sure that the cooling water complies with the following requirements:
Min. supply capacity l/min 5
Water pressure bar 2 ... 6
Supply temperature °C +5 ... +35
Required pressure differential across supply
and return
bar ≥ 1

Installation | 5
0870572240_RA0400-0630C_Ex_-0011_IM_en 15 / 40
• To reduce the maintenance effort and ensure a long product lifetime we recommend
the following cooling water quality:
Hardness mg/l (ppm) < 90
Properties Clean & clear
PH value 7 ... 8
Particle size µm < 200
Chloride mg/l < 100
Electrical conductivity µS/cm ≤ 100
Free chloride mg/l < 0.3
Materials in contact with the cooling water Stainless steel, copper and cast iron
NOTE
Water hardness unit conversion.
1 mg/l (ppm) = 0.056 °dh (german degree) = 0.07 °e (english degree) = 0.1 °fH (french
degree)
5.3 Earth Connection
In order to prevent the machine from creating an electrostatic charge:
• Connect the earth connection of the machine (ECP)
If an inlet filter (IF) being installed:
• Connect the earth connection of the inlet filter (ECI) in addition to the earth con-
nection of the machine.
Earth connection of
the machine (ECP)
Earth connection of
the inlet filter (ECI)

5 | Installation
16 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
5.4 Filling Oil
NOTICE
Use of an inappropriate oil.
Risk of premature failure!
Loss of efficiency!
• Only use an oil type which has previously been approved and recommended by
Busch.
For oil type and oil capacity see Technical Data [►34] and Oil [►35].
1
4
MAX
MIN
3
Busch Oil
2
Check oil level
5.5 Fitting the Coupling
E
L
Coupling hub (machine side) Coupling hub (motor side)Coupling sleeve
Radial screw
Max. admissible
torque: 17 Nm

Installation | 5
0870572240_RA0400-0630C_Ex_-0011_IM_en 17 / 40
Machine type Coupling size Value “E” (mm) Value “L” (mm)
RA/RC 0400 C
BoWex® M-65 4 114RA/RC 0502 C
RA/RC 0630 C
In case of a machine delivery without motor:
• Make sure that the ATEX marking of the coupling corresponds to the ATEX classi-
fication of the machine.
• Fit the second coupling hub on the motor shaft (separately delivered).
• Axially adjust the sleeve in such a way until value "E" (or “L”) is reached.
• When the coupling adjustment is done, lock the coupling hub by tightening the
radial screw.
• Mount the motor on the machine by including the coupling sleeve.
For further coupling information, go to www.ktr.com and download the instruction
manual of the BoWex® coupling.
5.6 Electrical Connection
DANGER
Live wires.
Risk of electrical shock.
• Electrical installation work must only be executed by qualified personnel.
NOTE
The operation with variable speed, i.e. with a variable-frequency drive or a soft starter
unit, is allowed as long as the motor is admitted and the permitted motor speed range is
neither underrun nor exceeded (see Technical Data [►34]).
Seek advice from your Busch representative.
• Make sure that the power supply for the motor is compatible with the data on the
nameplate of the motor.
• The electrical installation must comply with applicable national and international
standards.
• Provide a lockable disconnect switch on the power line so that the machine is com-
pletely secured during maintenance tasks.
• Provide an overload protection according to EN 60204-1 for the motor.
• Busch recommends installing a D-curve circuit breaker.
• Make sure that the motor of the machine will not be affected by electric or electro-
magnetic disturbance from the mains; if necessary seek advice from Busch.
• Connect the protective earth conductor.
• Electrically connect the motor.
NOTICE
Incorrect connection.
Risk of damage to the motor!
• The wiring diagrams given below are typical. Check the inside of the terminal box for
motor connection instructions/diagrams.

5 | Installation
18 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
5.6.1 Wiring Diagram Three-Phase Motor
NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
• Operation in the wrong direction of rotation can destroy the machine in a short time!
Prior to start-up, ensure that the machine is operated in the right direction.
• Determine the intended direction of rotation with the arrow (stuck on or cast).
• Jog the motor briefly.
• Watch the fan wheel of the motor and determine the direction of rotation just before
the fan wheel stops.
If the rotation of the motor must be changed:
• Switch any two of the motor phase wires.
Delta connection (low voltage): Star connection (high voltage):
Double star connection, multi-voltage
motor with 12 pins (low voltage):
4
4
4
Star connection, multi-voltage motor
with 12 pins (high voltage):
4
4
4
Delta connection, multi-voltage motor
with 12 pins (middle voltage):
4
4
4

Installation | 5
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5.7 Electrical Connection of the Monitoring Devices
NOTE
In order to prevent potential nuisance alarms, Busch allows that the control system is
configured with a time delay of 2 seconds.
NOTE
The accessories below are considered as standard.
If other specific components should be used, refer to the instruction manual of the ac-
cessory in question.
WARNING
If the monitoring sensors are not used.
Risk of explosion!
• Always use the mandatory monitoring sensors.
5.7.1 Wiring Diagram Temperature Switch
Part no.: 0651538812
Supplier reference: Trafag 414
P&ID position:
TS+/0101 “gas temp.”
TS+/0102 “gas temp.” (optional)
TS+/0104 “oil temp.” (optional)
2
1
T
1 = Brown ; 2 = White
Electrical data:
Ui=24VDC ; Ii=100mA ; Pi=0.6W; Li=0 µH; Ci=0 pF
Contact: Normally closed
Switch point: (factory default adjustment)
Ttrip (TS+/0101) = 140°C (for RA/RC 0400 and 0502 C)
Ttrip (TS+/0101) = 130°C (for RA/RC 0630 C)
Ttrip (TS+/0102) = 80°C (for RA/RC 0400-0630 C)
Ttrip (TS+/0104) = see Oil [►35] (for RA/RC 0400-0630 C)
5.7.2 Wiring Diagram Resistance Thermometer
Part no.: 0651563 753 (with transmitter)
Supplier reference: Wika TR31
Connector: M12x1, 4-pin
P&ID position:
TSA+/0101 “gas temp.”
TSA+/0102 “gas temp.” (optional)
TSA+/0104 “oil temp.” (optional)
1 2
43
3
1
+
-
1 = Brown ; 3 = Blue
Electrical data:
Ui=30VDC; Ii=120mA; Pi=750mW; Li=0µH; Ci=29.7nF
4 ... 20 mA ► 0 ... 150 °C

5 | Installation
20 / 40 0870572240_RA0400-0630C_Ex_-0011_IM_en
Warning signal:
Twarning (TSA+/0101) = 145°C ► 19.46 mA (for RA/RC 0400 and 0502 C)
Twarning (TSA+/0101) = 135°C ► 18.4 mA (for RA/RC 0630 C)
Twarning (TSA+/0102) = 75°C ► 12 mA (for RA/RC 0400-0630 C)
Twarning (TSA+/0104) = see Oil [►35] (for RA/RC 0400-0630 C)
Trip signal:
Ttrip (TSA+/0101) = 150°C ► 20 mA (for RA/RC 0400 and 0502 C)
Ttrip (TSA+/0101) = 140°C ► 18.93 mA (for RA/RC 0630 C)
Ttrip (TSA+/0102) = 80°C ► 12.53 mA (for RA/RC 0400-0630 C)
Ttrip (TSA+/0104) = see Oil [►35] (for RA/RC 0400-0630 C)
5.7.3 Wiring Diagram Pressure Switch
Part no.: 0653539030
Supplier reference: United Electric Controls
H100 (100 Series)
Maintenance procedure:
Procedure B
P&ID position: PS+/0301
Electrical data:
Ui=49VDC ; Ii=3A ; Li=0 µH; Ci=0 pF
Contact: Normally closed
2
1
P
Switch point: P (PS+/0301) = 1500 hPa (mbar) abs. (factory default adjustment)
5.7.4 Wiring Diagram Pressure Transmitter
Part no.: 0653204 444
Supplier reference: Wika IS-3
Connector: M12x1, 4-pin
P&ID position: PSA+/0301
1 2
43
3
1
+
-
1 = Brown ; 3 = Blue
Electrical data:
Ui=30VDC; Ii=100mA; Pi=800mW; Li=0µH; Ci=16.5nF
4 ... 20 mA ► 0 ... 1.6 bar (abs.)
Warning signal:
Pwarning (PSA+/0301) = 1.4* bar ► 18 mA
*1400 hPa (mbar) abs.
Trip signal:
Ptrip (PSA+/0301) = 1.5* bar ► 19 mA
*1500 hPa (mbar) abs.
5.7.5 Wiring Diagram Level Switch
Part no.: 0652 556 531
Supplier reference:
Endress&Hauser FTL50/FEL58
Connector: M12x1, 4-pin
P&ID position: LS-/0201
1 2
43
4
1
L
1 = Brown ; 4 = Black
Electrical data:
Ui = 16 VDC ; Ii = 52 mA ; Pi = 0.17 W ; Ci = 0 nF