Bosch Rexroth VT-MSFA1 User manual

Operating instructions
RE 30260-B/07.12
English
Booster amplifier
Type VT-MSFA1

The data specified above only serve to describe
the product. No statements concerning a certain
condition or suitability for a certain application can
be derived from our information. The information
given does not release the user from the obliga-
tion of own judgment and verification. It must be
remembered that our products are subject to a
natural process of wear and aging.
© This document, as well as the data, specifica-
tions and other information set forth in it, are the
exclusive property of Bosch Rexroth AG. It may
not be reproduced or given to third parties without
its consent.
The cover page shows an example configuration.
The product supplied may therefore differ from the
figure shown.
The original operating instructions were prepared
in German.

3/28 Bosch Rexroth AG VT-MSFA1 | RE 30260-B/07.12
Inhalt
1 About this documentation........................................................................5
1.1 Validity of the documentation ......................................................................5
1.2 Required and amending documentation .....................................................5
1.3 Representation of information .....................................................................5
1.3.1 Safety instructions.......................................................................................6
1.3.2 Symbols ......................................................................................................6
1.3.3 Designations ...............................................................................................7
2 Safety instructions....................................................................................7
2.1 General information on this chapter ............................................................7
2.2 Intended use ...............................................................................................7
2.3 Improper use ...............................................................................................7
2.4 Qualification of personnel............................................................................8
2.5 General safety instructions..........................................................................8
2.6 Product- and technology-dependant safety instructions .............................9
3
General warnings of damage to property and damage to the product ..... 10
4 Scope of delivery ....................................................................................11
5 Information on this product ...................................................................11
5.1 Performance description ...........................................................................11
5.2 Product description ...................................................................................12
5.2.1 Block diagram /pin assignment .................................................................12
5.2.2 Description of the individual components of the booster amplifier ............12
5.2.3 Monitoring functions ..................................................................................14
5.3 Product identification.................................................................................14
6 Transport and storage ............................................................................15
6.1 Storing the VT-MSFA1 ..............................................................................15
7 Assembly .................................................................................................15
7.1 Installation conditions................................................................................16
7.2 Necessary tools.........................................................................................17
7.3 Recommended accessories......................................................................17
7.4 Assembling the VT-MSFA1.......................................................................17
7.4.1 System-specific circuitry of the booster amplifier ......................................18
7.4.2 Connection overview.................................................................................19
7.4.3 Connection of the power supply unit .........................................................20
7.4.4 Connection of the on/off valve...................................................................21
7.4.5 Connection of the control system..............................................................21
7.4.6 Plug-in screw connectors ..........................................................................21
8 Commissioning .......................................................................................22
9 Operation .................................................................................................22
10 Maintenance and repair ..........................................................................23
10.1 Cleaning and care (maintenance) .............................................................23
10.2 Maintenance..............................................................................................23
10.3 Repair........................................................................................................23
11 Disassembly and replacement...............................................................23
11.1 Preparing disassembly..............................................................................23
11.2 Disassembling the VT-MSFA1 ..................................................................24
11.3 Preparing the components for storage/further use....................................24
12 Disposal ...................................................................................................24
12.1 Environmental protection ..........................................................................24
13 Extension and modification ...................................................................24
14 Troubleshooting......................................................................................24
14.1 How to proceed for troubleshooting ..........................................................24
15 Technical data .........................................................................................25
Inhalt

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16 Appendix..................................................................................................25
16.1 List of addresses .......................................................................................25
16.1.1 Contact person for repair ..........................................................................25
16.1.2 Contact person for support........................................................................25
17 Alphabetical index ..................................................................................26

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About this documentation
1 About this documentation
1.1 Validity of the documentation
This documentation applies to the following product:
•VT-MSFA1-XXX-1X/V0 in the following variants:
•VT-MSFA1-50-1X/V0 (for KSDER valve with coil 2.3 Ohm at 1.76 A),
mat. no. R901306231
•VT-MSFA1-100-1X/V0 (for 4SEC6...SO843 valve), mat. no. R901306230
•VT-MSFA1-150-1X/V0 (for 4WE6...SO893 valve), mat. no. R901306229
This documentation is intended for assemblers, operators and service engineers
and system end-users.
This documentation contains important information on the safe and appropriate
assembly, transport, commissioning, operation, use, maintenance, disassembly
and simple troubleshooting of the product.
fRead this documentation completely and particularly chapter 2 "Safety instruc-
tions" before working with the product.
1.2 Required and amending documentation
fThe product must not be commissioned until you have been provided with the
documentation marked with the book symbol and you have understood
and observed it.
Table 1: Required and amending documentation
Title Document number Document type
Booster amplifier RE 30260 Data sheet
Capacitor module RE 30750 Data sheet
Environmental compatibility statement
for the areas EMC, climate and me-
chanical load
RE 30260-U Environmental
declaration
2/2 directional seat valve, direct oper-
ated with solenoid actuation, type KSDE
RE 18136-23 Data sheet
3/3, 4/2 and 4/3 directional seat valve
with solenoid actuation, type SEC6
RE 22035 Data sheet
4/3, 4/2 and 3/2 directional valve with
wet-pin DC solenoids
RE 23178 Data sheet
Compact power supply unit VT-NE30-2X RE 29929 Data sheet
1.3 Representation of information
Consistent safety instructions, symbols, terms and abbreviations are used so that
you can quickly and safely work with your product using this documentation. For
a better understanding, they are explained in the following sections.

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About this documentation
1.3.1 Safety instructions
In this documentation, safety instructions are indicated whenever sequences of
actions are explained which bear the danger of personal injury or damage to prop-
erty. The measures described for the hazard avoidance must be observed.
Safety instructions are set out as follows:
SIGNAL WORD
Type and source of danger
Consequences in case of non-compliance
fMeasures for the hazard avoidance
•Warning sign: Draws attention to the danger
•Signal word: Identifies the degree of danger
•Type and source of danger: Specifies the type and source of danger
•Consequences: Describes the consequences in case of non-compliance
•Precautions: Specifies how the danger can be prevented
Table 2: Risk classes according to ANSI Z535.6-2006
Warning sign, signal word Meaning
DANGER Indicates a dangerous situation which will cause death
or severe personal injuries if not avoided.
WARNING Indicates a dangerous situation which may cause death
or severe personal injuries if not avoided.
CAUTION Indicates a dangerous situation which may cause minor
or medium personal injuries if not avoided.
NOTICE Damage to property: The product or the environment
could be damaged.
1.3.2 Symbols
The following symbols indicate notices which are not safety-relevant but increase
the comprehensibility of the documentation.
Table 3: Meaning of the symbols
Symbol Meaning
If this information is not observed, the product cannot be used and/
or operated optimally.
fIndividual, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that the steps must be carried out one after
the other.

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Safety instructions
1.3.3 Designations
The following designations are used in this documentation:
Table 4: Designations
Designation Meaning
VT-MSFA1 Booster amplifier
UB Operating voltage
2 Safety instructions
2.1 General information on this chapter
The booster amplifier was designed and manufactured according to the generally
accepted code of practice. However, there is still the danger of personal injury
and damage to property if you do not observe this chapter and the safety instruc-
tions in this documentation.
fRead this documentation completely and thoroughly before working with
the product.
fKeep this documentation in a location where it is accessible to all users at
all times.
fAlways include the required documentation when you pass the product on to
third parties.
fOnly operate the VT-MSFA1 booster amplifier in a technically immaculate
condition and as intended, in a safety- and risk-conscious manner, consider-
ing these instructions.
fIn case of faults impairing the safety and modifications to the operating behav-
ior, shut down the VT-MSFA1 immediately and report the faults to the respon-
sible personnel.
2.2 Intended use
The VT-MSFA1 boost amplifier is an electrical component.
You may use the product as follows:
•To control hydraulic on/off valves which have to be switched quickly.
•To create the clocked solenoid current for the on/off valves released according
to the data sheet.
The product is only intended for professional use and not for private use.
Intended use includes having read and understood this documentation complete-
ly, especially the chapter 2 "Safety instructions".
2.3 Improper use
Any use deviating from the intended use is improper and thus not admissible.

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Safety instructions
The installation or use of inappropriate products in safety-relevant applications
could result in unintended operating conditions when being used which in turn
could cause personal injuries and/or damage to property. Therefore please only
use a product for safety-relevant applications if this use is expressly specified and
permitted in the documentation of the product. For example in explosion protec-
tion areas or in safety-related parts of control systems (functional safety).
Bosch Rexroth AG does not assume any liability for damage caused by improper
use. The user assumes all risks involved with improper use.
Improper use of the product includes:
•Using the booster amplifier outside the specified performance limits and operat-
ing conditions and in particular the specified environmental conditions.
2.4 Qualification of personnel
The activities described in this documentation require basic knowledge of electrics
and hydraulics as well as knowledge of the appropriate technical terms. In order
to ensure safe use, these activities may only be carried out by a corresponding
expert or an instructed person under the direction and supervision of an expert.
Experts are those who can recognize potential dangers and apply the appropriate
safety measures due to their technical training, knowledge and experience, as
well as their understanding of the relevant provisions pertaining to the work to be
undertaken. An expert must observe the relevant specific professional rules.
2.5 General safety instructions
•Observe the valid regulations on accident prevention and for environmental protection.
•Observe the safety regulations and provisions of the country where the product
is implemented/used.
•Exclusively use Rexroth products in technically perfect condition.
•Observe all notices on the product.
•Persons who assemble, operate, disassemble or maintain Rexroth products
must not consume any alcohol, drugs or pharmaceuticals that may affect their
ability to react.
•Only use accessories and spare parts approved by the manufacturer in order to
exclude hazards to persons due to unsuitable spare parts.
•Comply with the technical data and environmental conditions specified in the
product documentation.
•The installation or use of inappropriate products in safety-relevant applications
could result in unintended operating conditions when being used which in turn
could cause personal injuries and/or damage to property. Therefore please only
use a product for safety-relevant applications if this use is expressly specified
and permitted in the documentation of the product.
•Do not commission the product until you can be sure that the end product (for ex-
ample a machine or system) where the Rexroth product is installed complies with
the country-specific provisions, safety regulations and standards of the application.

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Safety instructions
•Please observe the safety-relevant information and risk specifications in the
operating instructions of the manufacturer of the connected hydraulic system
before commissioning the booster amplifier with a hydraulic system.
•Technical data as well as connection and installation conditions are available in
the product documentation and must be imperatively observed.
•Please observe the general installation and safety instructions when working on
electric systems.
•You must generally not modify or retrofit the product.
2.6 Product- and technology-dependant safety instructions
WARNING
Dangerous movement!
Risk of injury due to incorrect control of the fast switching valve via the booster
amplifier and unforeseeable machine movements caused in this way.
fOnly operate the amplifier with the valve/coil combinations released in the
type key.
fComply with the safety according to EN 13849 or IEC 62061.
fIf persons must access the danger zone during active control, monitoring
or measures must be provided for personal safety which are superior to the
system. These measures must be provided according to the specific data
of the system and on the basis of the risk and failure analysis of the system
manufacturer/user. In this connection, the safety provisions applied for the
system must be taken into account.
fThe electronics always causes interference on other electronics, which lies
within the limit values. Thus, malfunctions in the control are possible. Only
use electronics under the EMC limit values or provide for corresponding
screening.
fThe electronics of the VT-MSFA1 booster amplifier reacts to electro-magnetic
interference of unshielded, incorrectly laid or incorrectly connected signal
lines. If the limit values specified in the data sheet are exceeded, malfunc-
tions or uncontrolled movements are possible. Comply with the limit values
specified in the data sheet; use only electronics under the EMC limit values or
provide for corresponding screening.
fElectrostatic processes, an incorrect earthing concept or missing potential
equalization may lead to damage to the electronics and thus cause malfunc-
tions or uncontrolled movements at the machine. Provide for correct earthing
and for potential equalization.
fIf the product is used outside the specified IP protection class, short-circuits
and malfunctions and thus uncontrolled machine movements may result.
You may therefore only use the product within the IP protection class and
environment specified in the data sheet.
fSeparately provide for safety functions for the personal safety. The
VT-MSFA1 booster amplifier itself does not include any safety functions for
personal safety and is no safety-relevant component. The booster amplifier is
solely used for the generation of the solenoid currents for on/off valves.

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General warnings of damage to property and damage to the product
WARNING
High electrical voltage by incorrect connection!
Danger to life, risk of injury caused by electric shock.
fDe-energize the relevant system part for all works and secure it against restarting.
fAll connections and terminals with voltages between 0 and 50 Volt may only
be connected with devices, electric components and lines with a protective
extra-low voltage (PELV).
fOnly connect voltages and electric circuits provided with a safe isolation from
dangerous voltages. Safe isolation can be achieved, for example, by isolating
transformers, safe optocouplers or mains-free battery operation.
Stroke of lightning!
Risk of uncontrolled machine movements.
fAn incorrect earthing concept or potential equalization may lead to damage
to the electronics. Provide for potential equalization for the device.
Failures and errors in the control circuits or the energy supply!
Risk of uncontrolled machine movements.
fComply with the safety according to EN ISO 13849 or IEC 62061.
CAUTION
Hot surfaces!
Risk of burning.
fSystem parts may become hot during operation. Allow the system parts to
cool down before touching them or wear protective gloves.
3 General warnings of damage to property
and damage to the product
NOTICE
High voltage!
Possible damage to the booster amplifier.
fOnly wire the booster amplifier in the de-energized condition.
High temperatures!
Possible damage to the booster amplifier.
fDo not use free-wheeling diodes in the solenoid conductors!
Wrong cables! Voltage loss, melting of the cable!
Risk of product damage.
fFor solenoid conductors up to a length of 10 m, the wire cross-section must
be 1.5 mm2, for lengths from 10 - 25 m 2.5 mm2. With greater lengths, please
contact us!

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Scope of delivery
NOTICE
Overload!
Risk of overload and damage to the supply line in case of insufficient design and/
or operation with several electric devices.
fProvide for current limitation by means of overload protection.
fDimension power supply unit and cable sufficiently.
Short-circuit!
Risk of overload and damage to the supply line in case of defects at the elec-
tric device.
fProvide for current limitation by means of overload protection.
Inadmissible temperature range!
Danger due to overheating. Device might be thermally destroyed.
fComply with the specifications in the data sheet.
4 Scope of delivery
The scope of delivery includes:
•Booster amplifier
Accessories such as cable and power supply unit and cable sets are not included
in the scope of delivery and must be ordered separately. See chapter 7.3 "Rec-
ommended accessories" on page 17.
5 Information on this product
5.1 Performance description
The VT-MSFA1 booster amplifier is used to control hydraulic on/off valves which
are to be switched fast. The booster amplifier is available in three variants which
control different valve coils each.
•VT-MSFA1-50-1X/V0 for KSDER valves with coil 2.3 Ohm / 1.76 A
•VT-MSFA1-100-1X/V0 for 4SEC6...SO843 valve
•VT-MSFA1-150-1X/V0 for 4WE6...SO893 valve
By means of the internally generated boost voltage which is connected to the
valve solenoid during the boost phase and the resulting higher solenoid current
(>> INominal) considerably reduced switching times of the valve can be achieved.
In holding operation, the solenoid current is reduced. This reduces the actuator
operating temperature which again favors a longer service life of the actuator.

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Information on this product
5.2 Product description
The booster amplifier is snapped onto carrier rails according to DIN 50022. The
electrical connection is established via individually removable plug-in screw con-
nectors. The module is operated with 24 V direct voltage.
The internal power supply unit supplies all internally required positive and nega-
tive supply voltages and the boost voltage for the actuator overexcitation. Thus, no
additional external voltage has to be fed in. As soon as the power supply unit is in
operation, the green LED ("Ready for operation") lights up. In case of cable break,
short circuit and internal errors, it will go out.
The booster amplifier comprises reversed polarity and short-circuit protection of
the load circuit (output stage) and reversed polarity protection of the voltage sup-
ply terminals.
A 24 V status output "Ready for operation" is available for analysis, e.g. in a PLC.
Two equivalent switching inputs (AND linked) are provided for the control of the
booster amplifier.
The booster amplifier has an integrated fast shut-down.
5.2.1 Block diagram /pin assignment
´
UI
0 V
&
error
ok
n.c.
ok
&
1
2
3
5
6
4
IN 1
IN 2
UBUBoost
UB
Uint
error
UBoost
UB
Uint
DC
DC
ok
DC
DC
+UB
3
4
1
2
7
8
5
6
Fig. 1: Block diagram VT-MSFA1
1 Power supply unit
2 Switching inputs
3 Voltage and current profile generator
4 Output stage
5 Fault recognition
6 On/off valve
5.2.2 Description of the individual components of the booster amplifier
The figures specified in brackets refer to the item numbers indicated in the
block diagram.
The internal power supply unit provides all internally required supply voltages.
If voltage is applied to one of the two switching inputs "IN1" or "IN2" (2), which is
less than / equal to the switch-off threshold , the output stage is switched off,
irrespective of the current phase (boost, pull-in or holding phase) and the current
actual current value. Then, there is a fast shut-down of the valve.
Power supply unit (1)
Switching inputs (2)

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Information on this product
If voltage is applied to both switching inputs "IN1" and "IN2" (2), which is greater
than / equal to the switch-on threshold, the output stage is activated.
If voltage is applied to both switching inputs "IN1" and "IN2" (2), which is greater
than / equal to the switch-on threshold, the voltage and current profile generator
will create an internal control signal for the output stage (4). This signal will be
used by the output stage (4) for the generation of a voltage/current profile for the
overexcitation of the valve solenoid (terminal 7 and 8).
If voltage is applied to both switching inputs "IN1" and "IN2" (2), which is greater
than / equal to the switch-on threshold, the output stage is activated. By means of
the voltage and current profile generator (3), the output stage generates a volt-
age/current profile (see figure 2) at the valve solenoid (terminal 7 and 8), which
leads to overexcitation of the solenoid. This overexcitation allows for considerably
reduced switching times of the valve.
Fig. 2: Current profile of the VT-MSFA1
The output stage outputs (terminals 7 and 8) are protected against reversed po-
larity and short-circuit. Apart from that, the output stage will be de-energized if one
of the two switching signals "IN1" or "IN2" is missing or if a fault is identified.
In order to ensure fast shut-down of the valve, no free-wheeling diode must be
connected to the solenoid of the on/off valve!
Voltage and current profile
generator (3)
Output stage (4)
Current
IA
IH
IL
On
Boost
phase tB
Pull-in
phase tA
Time t
IA = Pull-in current
IH = Holding current
IL = Charging current
Fast shut-down
Current in the solenoid coil of the on/off valve
Current in the module amplifier supply line
Holding phase
Loading phase tL
Off

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Information on this product
5.2.3 Monitoring functions
It is the task of the booster amplifier monitoring functions to identify faults in the
system and in the solenoid conductors and to initiate the corresponding measures
in case of fault.
In case of fault, the output stage is deactivated. The "Ready for operation" output
(terminal 5) is switched off (high-impedance output > 20 kOhm) and the green
"Ready for operation" LED on the front side goes out.
The fault recognition monitors the following:
•Undervoltage of +UB
•Cable break of the solenoid conductors (terminal 7 and 8)
•Short-circuit of the solenoid conductors (terminal 7 and 8)
•Connection of a high-impedance valve solenoid (greater 5 Ohm)
If there is no fault, the green "Ready for operation" LED at the front side is illumi-
nated and the "Ready for operation" output is switched to +UB operating voltage.
If the value falls below the min. operating voltage uB(t)min, the required pull-in or
holding current can no longer be guaranteed. The output stage is deactivated, the
green "Ready for operation" LED at the front side goes out and the "Ready for
operation" output is switched off.
Only if uB(t)min is exceeded will the output stage be reactivated and the electron-
ics changes into the fault-free operating state.
Attention: After the cause of error has been remedied and a voltage greater
than / equal to the switch-on threshold has been applied to both switching
inputs "IN1" and "IN2" (2), the output stage will be immediately activated.
Afterwards, the electronics starts a new switching sequence.
As long as no valve or valve solenoid is connected at the booster amplifier, the
green "Ready for operation" LED remains off and the "Ready for operation"
output (terminal 5) remains switched off (high-impedance output > 20 kOhm).
5.3 Product identification
Fig. 3: Ordering code
Fault recognition (5)
Analog amplifier in modular design for controlling
a fast switching valve
for KSDER valve with coil 2.3 Ohm / 1.76 A = 50
for 4SEC6...SO843 valve = 100
for 4WE6...SO893 valve = 150
Further details in the plain text
1X = Series 10 to 19
(10 to 19: Unchanged technical data and pin assignment)
VT–MSFA1 1X V0 *

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Transport and storage
6 Transport and storage
There are no special transport instructions for this product. You must, however,
observe the notes in chapter 2 "General safety instructions" and comply with the
environmental conditions for storage and transport which are detailed in the tech-
nical data of data sheet 30260.
6.1 Storing the VT-MSFA1
Proceed as follows in order to prepare the VT-MSFA1 booster amplifier for stor-
age and further use:
fOnly use the original packaging for storage.
fComply with the admissible storage temperature range (see RE 30260).
fProtect the VT-MSFA1 from dust and humidity.
7 Assembly
WARNING
Pressure equipment or device parts flying around!
Risk of injury caused by parts flying around or oil jet spurting out if hydraulic
parts or hydraulic lines have not been correctly or completely assembled before
application of the pressure
fDepressurize the relevant part of the system before the assembly.
fUse sufficiently dimensioned connection threads with sealing points.
fHave the assembly performed by an expert according to these instructions
and check the system before commissioning with corresponding overpres-
sure according to ISO 4413.
CAUTION
Fault currents and short-circuits!
Impairment of safety and malfunctions.
fThe environment must be free from electrically conductive contamination
(acids, bases, corrosive agents, salts, metal vapors, etc.) and the device
must not be exposed to these substances. Rule out any deposits according
to protection class IP 20.
Cables lying around!
Risk of stumbling!
fLay the cables and lines so that they cannot be damaged and no one can trip
over them.

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Assembly
NOTICE
Major potential differences!
Danger of destroying the VT-MSFA1 by connecting or disconnecting plug-in con-
nectors under voltage.
fSwitch off power supply to the relevant system component before assembling
the device or when connecting and disconnecting connectors. Damaged
devices due to incorrect installation are not covered by the warranty!
fObserve protection class, voltage supply and environmental conditions ac-
cording to data sheet RE 30260.
Interference!
Risk of malfunctions.
fThe distance to radios must be sufficient (>> 1 m).
fWith a strongly fluctuating operating voltage, it may in the individual case
be necessary to use an external smoothing capacitor with a capacity of at
least 2200 µF.
Recommendation: Capacitor module VT 11110-1X (see RE 30750); sufficient
for up to 2 booster amplifiers.
fThis module is intended for installation into a shielded EMC housing (control
cabinet). All lines leading outwards are to be shielded whereas complete
shielding is required.
Interference!
Risk of impairment of other devices.
fUse shielded signal lines and/or solenoid conductors and the VT-NE30
power supply unit (or comparable) for the VT-MSFA1 in order to satisfy the
EMC requirements.
Overheating!
The device might be destroyed.
fProvide for sufficient air circulation by means of clearance area to the right,
to the left, upwards and downwards. See fig. 4.
Condensed water!
Damage to the electronics and impaired functionality due to penetrating water.
fAllow the booster amplifier to acclimate itself before the assembly and
switch-on.
7.1 Installation conditions
The VT-MSFA1 booster amplifier is intended for top hat rail mounting in the con-
trol cabinet in vertical installation position. The dimensions are listed in the data
sheet RE 30260.
Make sure that there is sufficient clearance area to the right and to the left, at
least 25 mm. By observing a minimum distance of 50 mm downwards and up-
wards, ensure sufficient air circulation to the ventilation slots in the housing.

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Assembly
Min. 50 mm clearance area
Min. 50 mm clearance area
Min. 25 mm clearance area Min. 25 mm clearance area
Fig. 4: Required distances
7.2 Necessary tools
No special tools are required for the assembly.
7.3 Recommended accessories
The following accessories are recommended for the connection of the VT-MSFA1
booster amplifier. These accessories are not included in the scope of delivery,
and can be ordered separately from Bosch Rexroth.
Table 5: Accessories
Component Material number
Capacitor module VT11110-1X R900020293
Compact power supply unit VT-NE30-2X R901082348
7.4 Assembling the VT-MSFA1
fFor the assembly, observe the notices regarding applied standards and ap-
plication conditions in the data sheet.
fDo not lay solenoid conductors and signal lines near power cables.
fUsed shielded cables (EMC-compatible) for signal and valve lines.
fDo not use silicone-containing sealing, adhesive, or insulating agents.
fEnsure a maintenance-friendly installation, i.e. simple access to the connec-
tion lines. Free access to the connection side must be guaranteed. The cable
ends should be sufficiently long so that the amplifier can also be dismounted
in the wired condition.

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Assembly
fBefore installation note down the information on the name plates. If, after the
installation, name plates are no longer visible or legible, these data will be
quickly available to you at any time.
fEnsure during the assembly of several modules that there is still enough
space for any subsequent removal of the booster amplifiers.
The installation position of the booster amplifier is vertical. It is assembled without
tools on a carrier rail TH35-7,5 according to EN 60715 (top hat rail). Foot latches
with spring pressure are provided for fixation of the module housing.
By snapping the housing of the VT-MSFA1 on a conductive assembly rail, the
earthing connection is established. This constitutes the HF earthing of the
VT-MSFA1 booster amplifier.
fEngage the booster amplifier on the carrier rail. A foot latch (with spring pres-
sure) prevents loosening of the module housing from the carrier rail.
fFor loosening the module, push the foot latch downwards.
Carrier rail TH35-7,5
according to EN 60715
Foot latch for fixing the
amplifier module at the
carrier rail
For loosening the module, push
the screwdriver into the foot
latch opening and push it in the
direction of the arrow
Fig. 5: Assembling/disassembling the booster amplifier
7.4.1 System-specific circuitry of the booster amplifier
All device connections (2 plug-in screw connectors, see chap. 7.6.4, 2-pole, wire
cross-section: 0.2 mm2to 2.5 mm2) are located on the booster amplifier front side.
Rigid or flexible wires are possible.
Limitations with regard to line length and cable thickness are possible depend-
ing on the mating connectors used of the components to be connected. Lay all
lines (e. g. for supply, switching signals, valve solenoid, etc.) considering the
technical data (input resistance, current consumption) with regard to cable
thickness and length so that the operating data and working ranges (input
voltages, current consumption) are complied with.

19/28 Bosch Rexroth AG VT-MSFA1 | RE 30260-B/07.12
Assembly
The circuitry of the booster amplifier refers to the connection
•of the power supply unit (see chapter 7.4.3)
•of the valve (see chapter 7.4.4)
•of the superior control system (see chapter 7.4.5)
7.4.2 Connection overview
For the electrical connection, the machine manufacturer's connection diagrams
and their work instructions are always binding!
Necessary components like e.g. EMERGENCY STOP circuits, mains switches,
etc. must be provided and included by the system project planner according to the
accepted state-of-the-art and best safety possible.
The VT-MSFA1 booster amplifier has 4 inputs and 3 outputs on 8 terminals.
1 2 3 4
5 6 7 8
OK
MSFA1
1 - 4
5 - 8
Terminals
Plug-in screw
connectors
Plug-in screw
connectors
Fig. 6: Booster amplifier front view
Table 6: Overview of the terminals
Terminal Terminal
designation
Type Comment Supply line
from / to
1 +UB Input Operating voltage Power supply
unit
2 0 V and/or
ground
Input Reference potential of the
operating voltage +UB
and the Ready for opera-
tion output
Power supply
unit
3 IN1 Input Output stage activation
("AND" connection of
both signals)
Control
4 IN2 Input Control
Terminal assignment

20/28 Bosch Rexroth AG VT-MSFA1 | RE 30260-B/07.12
Assembly
Terminal Terminal
designation
Type Comment Supply line
from / to
5 Ready for
operation
Output
(high active)
HIGH as soon as the internal
power supply unit works and
no errors are available.
Control
6 - - n.c.
7 Output Solenoid Valve
solenoid
8 Output Solenoid Valve
solenoid
Fig. 7: Typical wiring
7.4.3 Connection of the power supply unit
NOTICE
Dangerous electrical voltage!
Risk of injury.
fMake sure that the 24 V DC input voltage satisfies the requirements of
"safe isolation".
If possible, design the system circuit so that the booster amplifier and all coupled
components are always switched on together.
The VT-MSFA1 booster amplifier uses the applied operating voltage to create the
internally/externally required system voltages for
•Logic
•Output stage
•Signal processing
Ready for operation OK Valve solenoid
Carrier rail TH35-7,5
Voltage supply + UB
0V Switching inputs
IN 2
IN 1