Voith DSG-B03212 User manual

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 1 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
7
I/H Converter
Type: DSG-B03212
Type: DSG-B07212
Translation of the original version
Installation and Operating Manual
Version 4.1
ATTENTION!
Please make sure to read this instruction manual prior to transport, installation,
commissioning, operation, etc. and keep it for further use!

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 2 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
If you have any questions concerning the I/H converter,
please contact J.M. Voith SE & Co. KG, Crailsheim,
After-Sales Service of Product Group Division Digital
Ventures in Crailsheim, indicating the article number and
the serial number of the I/H converter.
J.M. Voith SE & Co. KG
P.O. Box 15 55
D-74555 Crailsheim
Switchboard: +49 - 7951 / 32 - 0
Fax No.: +49 - 7951 / 32 - 500
After-Sales Service of Product Group
Division Digital Ventures
Direct dial: +49 - 7951 / 32 - 470
Direct fax: +49 - 7951 / 32 - 605
Email: [e-mail]
Address for deliveries of goods:
Voith Group │ Division Digital Ventures
J.M. Voith SE & Co. KG
Voithstraße 1
D-74564 Crailsheim
This instruction manual describes the design standard of
the I/H converter types DSG-B03212 and DSG-B07212
delivered as of 2019 / 02.
It does not consider any alterations or modifications on
the I/P converter which have not been performed by J.M.
Voith SE & Co. KG. Any such alterations or modifications
are exempted from all warranty claims.
J.M. Voith SE & Co. KG 2019
This Instruction Manual are protected by copyright laws.
It must not be translated, duplicated (mechanically or
electronically) in whole or in part, or passed on to third
parties without the publisher's written approval.
Revised on: 2019 / 02
Order No. 918 3626018861 en
Version: 4.1
Printed in Germany

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 3 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
Contents
Installation and Operating Manual
Page
1Technical Data ............................................................................................................................... 4
1.1 I/H converter............................................................................................................................. 4
2Safety Information......................................................................................................................... 6
2.1 Definition of symbols and warnings ......................................................................................... 6
2.2 Proper use................................................................................................................................ 6
2.3 Important information............................................................................................................... 6
2.4 Warranty................................................................................................................................... 8
3Function.......................................................................................................................................... 9
4Packing, Storage and Transportation........................................................................................ 12
5Installation.................................................................................................................................... 13
5.1 Assembly................................................................................................................................ 13
5.2 Hydraulic connection.............................................................................................................. 14
5.3 Electrical connection.............................................................................................................. 14
6Commissioning............................................................................................................................ 15
6.1 Test Run................................................................................................................................. 15
6.2 Parameter setting................................................................................................................... 15
6.2.1 Potentiometer effect.................................................................................................. 16
6.2.2 Factory setting........................................................................................................... 16
7Operation...................................................................................................................................... 17
7.1 Operation with manual operation knob.................................................................................. 17
7.2 Normal operation ................................................................................................................... 17
7.3 Troubleshooting ..................................................................................................................... 18
8Maintenance, Servicing, and Inspections................................................................................. 19
8.1 Maintenance and servicing.................................................................................................... 19
8.2 Inspections............................................................................................................................. 20
8.3 Spare parts information.......................................................................................................... 20
9Decommissioning........................................................................................................................ 21
10 Annex............................................................................................................................................ 22

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 4 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
1 Technical Data
1.1 I/H converter
I/H converter
DSG-B03212
DSG-B07212
Article number
9 186827 0
9 186826 0
Instruction Manual No. 918 3626018861
Marking II 2G IIC T4
Protection IP 65 as per EN 60529
Ambient temperature TA
-30 ... +60
°C
Ambient temperature (storage)
-40 ... +90
°C
Installation conditions Indoor installation
Outdoor installation Offshore Industr. atmosph.
Hydraulic Data
Supply pressure P max.
40
bar
Supply pressure P min. PA max + 1.5 bar
Pressure adjusting range PA (output pressure)
See Chapter 6.2.1
Flow rate P → A at ∆P = 1 bar
17
l/min
Flow rate A → T at ∆P = 1 bar
18
l/min
Return pressure on T1 and T2
0
bar
Leakage at T1 (Toil = 50 °C and P=10 bar) < 4 l/min
Leakage at T2
< 1
l/min
Operating medium
Type
Hydraulic oil as per DIN 51524
Turbine oil as per DIN 51515
High-flash point fluid1)
oil temperature during operation +10 … +60 °C
Cleanliness grade (ISO VG 4406) - / 19 / 16
Viscosity (DIN 51519)
ISO VG 32 … ISO VG 46
Mechanical Data
Weight approx. 12 kg
Installation position
See Chapter 10
Dimensions, fastening See Chapter 10
Hydraulic connection
See Chapter 10
Sealing material
FPM2)
Special design4)
NBR3)
1) according to the customer's specification and consultation with J.M. Voith SE & Co. KG │ Division Digital Ventures
2) Fluor-caoutchouc
3) Acrylnitril-Butadien-caoutchouc
4) According to customer's request or especially for high-flash point fluids

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 5 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
Electrical Data
Supply voltage 24 (+10% / -15%)
V DC
Current consumption
approx. 0.7, max. 3 for t < 1 sec
A
Control Parameters
Setpoint w
for pressure adjusting range PA min….PA
max w = 0/4 … 20 mA
Input load 25 Ω
Input configuration
E360 Electronics
E503 Electronics
Applied, related to GND
Isolated (500 kΩ)
Setpoint limitation
E360 Electronics
E503 Electronics
w > 35
w > 90
mA
mA
Adjustment ranges X0 and X1
See Chapter 6.2.1
Magnetic force switch-off at
(only with E503 electronics) w < 3 mA
Voith Control Magnet (VRM)
marking with cable end
II 2G Ex db IIC T4
Protection IP 65 as per EN 60529
Ambient temperature TA at T4 -30 … +60 °C
… in connection with components
Cable entry
(cable end design) II 2G Ex db IIC T4-T6

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
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918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
2 Safety Information
2.1 Definition of symbols and warnings
Symbol Damage/harm
to ... Signal word Definition Consequences
Persons,
property EX- PROTECTION! Indication for Ex-protection
Explosion hazard
Persons DANGER! Imminent danger Fatal or most
serious injuries
(crippling)
Persons WARNING! Dangerous situation possible Fatal or most
serious injuries
possible
Property ATTENTION! Harmful situation possible Possible damage to
- the product
- its environment
– Note!
Information! Application details and other useful information Efficient in operation
2.2 Proper use
The I/H converter is provided to convert an electric set signal, e.g. 4 - 20 mA, to the
corresponding hydraulic output pressure reduced to the supply pressure. This allows, for
example, remote-controlled, infinitely variable adjustment of control pistons on hydraulic
cylinders positioning valves of steam turbines.
The permissible temperature of the hydraulic oil is +10 °C … +60 °C.

The max. surface of the device is significantly determined by the temperature of the
hydraulic oil.
For the operation it is therefore vital to ensure that the max. permissible oil temperature
will not be exceeded!
2.3 Important information
The following information refers to the entire instruction manual and is to be observed in
addition to the individual instructions.
Accident prevention

It is imperative to observe the requirements of the relevant standards and regulations
when connecting an I/H converter in explosion-proof design.

There must not be any potentially explosive atmosphere during all works performed,
such as e.g. transportation, storage, installation, electrical connection, commissioning,
test run, maintenance and servicing!

Operating medium leaving/leaking from the I/H converter may get in contact with hot
machine parts, posing a risk of fire.

When working on the I/H converter, it is vital to wear protective clothing.

On commissioning or operation of the I/H converter, spraying hydraulic oil may get
into
the eyes causing blindness. Wear protective glasses for all works performed on the I/H
converter.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
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D – 74564 Crailsheim
Version: 4.1

The I/H converter is a hydraulic unit.
Any improper use may lead to the leakage of
operating medium under pressure, posing a
risk to the health and life of the operating
staff. Prior to performing any work on the I/H converter, switch off the hydraulic auxiliary
energy.

During operation, the outer surfaces of the I/H converter and the hydraulic connecting
lines may become hot d
ue to the operating medium. Any contact may cause injuries by
burning. Prior to performing any work on the I/H converter, let the I/H converter cool
down.

On commissioning or operation of the I/H converter, the end of the piston rod directly or
indirectly driven by the I/H converter may move uncontrolled in case of failure of the
hydraulic or electric energy, due to malfunctions in the master control or on the I/H
converter. This movement may pose a risk to both individuals and property. Prior to
performing any work on the I/H converter, switch off the hydraulic and electric auxiliary
energy.

Electric components are integrated in the I/H converter which may be destroyed, e.g.
during electric welding near the I/H converter. Prior to performing electric welding near
the I/H converter, remove all electric connecting lines.
Environmental protection

On assembly, disassembly or improper use of the I/H converter, operating medium may
leak out. Operating oil getting into the sewage system or open soil causes severe
environmental damages. Collect leaking operating medium and dispose of it in
accordance with the national statutory provisions.
Painting

In case of repaints or mendings of the paint on a device, please ensure that the
maximal permissible total f
ilm thickness will not be exceeded. For devices of Gas
Groups IIA and IIB, it is 2 mm and for devices of Gas Group IIC it is 0.2 mm.
Instruction Manual

The instruction manual contains important information regarding proper handling of the
I/H converter. Prior to installation and commissioning of the I/H converter, carefully read
the entire instruction manual and make sure you fully understood its content.

Keep the instruction manual in a place constantly accessible to the operating staff.

In addition to this instruction manual, have the rules governing accident prevention and
environmental protection available and observe the same.
Please keep for later reference.
Staff qualification

Only trained and instructed personnel are allowed to work on the I/H converter. These
personnel must be sufficiently trained, instructed and authorized to properly mount,
operate and maintain the I/H converter in accordance with the safety standards.

Installation, commissioning and operation have to be performed by a certified electrician
with experience and knowledge in the field of explosion protection.
Constructional modification

Mounting work and structural modifications are not permitted.

The screw fitting of the cable entry on the control magnet (VRM) is secured against
distortion. Do not distort or slacken the screw fitting.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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Version: 4.1
2.4 Warranty
The terms and conditions stated in the General Terms and Conditions of Sale
for Industrial Engineering of J.M. Voith SE & Co. KG │ Division Digital Ventures,
Crailsheim, shall apply. Warranty claims are excluded if these are due to one or several of
the following causes:
•Improper transportation, storage, installation, connection, commissioning, operation,
maintenance and repair of products of the I/H converter.
•Failure to observe the operational and product safety regulations included in this
instruction manual.
•Use of spare parts not approved by J.M. Voith SE & Co. KG │ Division Digital Ventures,
Crailsheim.

During the warranty period, repairs to the I/H converter are only to be performed with
the approval of J.M. Voith SE & Co. KG │ Division Digital Ventures, Crailsheim.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
3 Function
The I/H converter is an electro-hydraulic, remote controllable current-to-pressure converter.
With a setpoint of w = 0/4 mA to 20 mA, the requested output pressure PA can be set
quickly and hysteresis-free. For instance, a pilot piston or a hydraulic cylinder may be
positioned against a restoring spring.
For the operation of the I/H converter, electric and hydraulic auxiliary energy is required. All
electric components necessary for the I/H converter operation are integrated in the I/H
converter and protected against environmental influences. The controllers with connections
for setpoint limitation and magnetic force control are installed in the Voith control magnet
(VRM). With potentiometers X0 and X1 which are accessible from outside, the output
pressure PA can be allocated to setpoint w.
Function of manual operation knob
The control magnet of the I/H converter is provided with a manual operation knob. Same
can be used instead of the magnetic force FMag to define a spring force, adjustable via the
manual operation knob, which controls the piston via the magnet armature and the tappet.
The hydraulic force FHyd being proportional to the output PAacts against this spring force.
Thus adjustment of the output pressure is possible without electric connection.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
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918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
View of I/H converter
Fig. 1: Sectional view of I/H converter
Voith control magnet VRM (A)
With integrated magnetic force control
Electrical connection (A1)
Manual opertion knob (A2)
Potentiometers X0 and X1 (A3)
Tappet for power transmission (A4)
Slide valve (B)
With pressure-reducing arrangement
Control housing (B1)
Control piston (B2)
Control spring (B3)
Cover (B4)
Hydraulic connections
Supply pressure P
Output pressure PA
Tank return line T1
Tank return line of leakage T2
Magnetic force FMag
Spring force FFed
Hydraulic force FHyd

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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Version: 4.1
Block diagram - I/H converter
Fig. 2: Block diagram of I/H converter
Pressure control
The control system controls the I/H Converter by an electric signal w = 4…20 mA for the
power setpoint UMag. The actual value in the magnetic system is measured by a Hall
probe and returned to the magnetic force controller as UHall. The magnetic force FMag
assigned to the setpoint w by potentiometers X0 and X1 is transmitted to the control piston
via a tappet. The hydraulic force FHyd being proportional to the output pressure PA acts
against the magnetic force. In balanced condition, the control piston is in center position
and the output pressure PA corresponds to setpoint w.
Spring force FFed of the control spring generates a force offset in order to ensure the I/H
converter function also with output pressures near 0 bar.
Limitation of maximum value
In case of incorrect connection of the setpoint, e.g. by unintentional connection of 24 VDC
to the plus-port of the setpoint input, the setpoint current is limited to an uncritical value by
means of an overload protector integrated in the VRM, thus protecting the I/H converter
control against damage.
I/H Converter
Voith control magnet
Magnetic force controller
Control
stadion
Magnetic system
Hydraulic part

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
4 Packing, Storage and Transportation
Packing
The I/H converter is supplied in special packaging. All hydraulic connection openings are
sealed with protective plugs.
Storage and preservation
The outer surfaces of the I/H converter are electro-plated. On delivery, the inner parts of
the I/H converter which are not surface-coated are moistened with preservation oil.

Within Europe, this preservation is sufficient as corrosion protection for about 8 months,
provided the I/H converter is stored in a dry location.
If it is intended to store the I/H converter for a longer period of time, special precautions
have to be taken. Coordinate such precautions for each individual case with J.M. Voith SE
& Co. KG │ Division Digital Ventures, Crailsheim.

The ambient conditions for storage must be within the limits indicated in Chapter 1.
Transportation

It is not allowed to transport the I/H converter in an explosive atmosphere! This also
applies to the transportation of spare parts!

Improper transportation or lifting of the I/H converter module may cause damage to
property and persons.

Observe, in particular, that constraining forces do not act on the cable entry of the
control magnet (VRM) and that the connecting line is not damaged.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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918 3626018861 en
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Version: 4.1
5 Installation

Installation and operation of the I/H converter is only allowed for the conditions stated in
Chapter 1.

Do not install the I/H converter in an explosive atmosphere!

During operation, explosive atmosphere may get into the way valve via the tank.
Therefore, the hydraulic tank must not be set up in zone 0.

Only personnel satisfying the qualifications according to Section 2.3 are allowed to work
on the I/H converter.

Improper ins
tallation of the I/H converter module may cause malfunctioning and
premature failure of the I/H converter.

Cleanliness is imperative during both installation and connection. Prevent any impurities
(dust, metal chips, etc.) from getting into the interior of the I/H converter or into the
piping system. Any such impurities may cause damage to the I/H converter.

During the installation period, cover and protect the I/H converter and, in particular, the
electric and hydraulic connections.
5.1 Assembly

Wear protective glasses when connecting the I/H converter hydraulically.

Pay attention to the correct pressure stage when selecting pipes,
flexible tubes, unions
and flanges.
Immediately replace any damaged pipes and flexible tubes.

Mount the I/H converter in accordance with the permissible installation position
indicated in Chapter 1.
Recommended fastening bolts

2 M10 hex. screws,

Property class 8.8 with washer

Tightening torque MA= 35 Nm, thread oil-moistened.
Select the screw length according to the installation situation.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
5.2 Hydraulic connection
When assembling the pipes, ensure that they are not fastened to any moving equipment,
but rather to fixed structures free from vibration.
Alterations in length caused by temperature variations must not apply constraining forces
to the I/H converter.

Fixing and hydraulic connection to a connecting flange is made via the hydraulic part.
O-rings
are used for sealing. The customer's connecting surface must correspond to Ra
≤ 1.6 µm and Rmax ≤ 6.3 µm.

To guarantee proper functioning of the I/H converter, external pressure variations must
not affect tank return line T2. In practice, the tank return l
ines T1 and T2 can be brought
together, provided the joint pipe is laid to the tank in descending position and with a
nominal width ≥ 20 mm.

Residual oil (up to 0.2 l) may leak when removing the screw plugs. Collect the oil in a
suitable container and dispose of it properly.

Do not use fibrous or hardening sealing compounds, such as hemp or mastic, for
sealing the connections and pipe unions.
Prior to installation, clean pipes from dirt, cinder, sand, chips, etc.
Pickle welded piped. Clean and flush carefully the pipes and the whole hydraulic system
before installing the I/H converter.

A flushing plate can be supplied for the flushing process. See Chapter 10, Annex.

An adapter can be supplied to connect the I/H converter to the piping system. See
Chapter 10, Annex.
5.3 Electrical connection

Only a certified electrician with experience and knowledge in the field of explosion
protection is allowed to connect the servomotor electrically in accordance with the
electro-technical rules and legal provisions of the country of manufacture.

Signal and supply lines provided by the customer to the I/H converter need to be
screened and laid separately from each other.

When connecting the customer's lines, please avoid parallel running of way valve lines
with the lines of the current converter assemblies.
Poor connecting points do not guarantee a reliable operation of the I/H converter.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
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Version: 4.1
6 Commissioning

Prior to delivery, the I/H converter has been tested and adjusted at J.M. Voith SE & Co.
KG │ Division Digital Ventures
. The settings are documented in the supplied test report.
Potentiometers X0 and X1 are covered with a cap for protection against unintentional
maladjustment and entry of dirt.
On commissioning, please check all connections of the hydraulic and electric supply
systems. Commissioning must only be continued after ensuring that all hydraulic and
electric connections have been properly wired (Chapter 5).
6.1 Test Run
How to de-aerate the hydraulic system

Make sure that there is no explosive atmosphere during the test run and the de-
aeration
process!
•Switch on the power supply.
•Switch on the oil supply and check the supply pressure P.
•Enter setpoint w = 0 mA.
•After 5 minutes, switch on setpoint w = 4 mA.
•Operate the I/H converter for a period of min. 10 minutes at a setpoint sine rhythm (4
mA to 20 mA). Alternatively, it is possible to run the setpoint via a ramp (attention:
longer de-aeration time!). If it is not possible to specify a setpoint sine rhythm, a setpoint
w = 20 mA can be directly connected and disconnected via a setpoint source.
During the test run, check all hydraulic connections for leaks. In case of leaks, immediately
switch off the hydraulic supply system and remedy the leakage.
6.2 Parameter setting

Due to unintentional maladjustment of the parameters or changed operating conditions,
one or both parameters may have to be readjusted. We recommend documenting the
adjustment of the parameters as well as the set values.
The parameters are adjusted by means of potentiometers X0and X1. For position of
potentiometers, please see Chapter 10.

Prior to the test run, please ensure that the
pipes and the hydraulic system have been
cleaned. Cleanliness of the operating medium must correspond to the cleanliness grade
stated in Chapter 1. Cleaning and flushing operations essential to the operating medium
must not be performed with the I/H conve
rter hydraulically connected. Operation of the
I/H converter with contaminated operating medium is not permitted and may damage
the I/H converter.

During the test run, air pockets in the hydraulic piping system may cause temporary
pressure variations at output pressure PA. In such cases, please de-aerate the system.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
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Version: 4.1
6.2.1 Potentiometer effect

Set X1 at setpoint w = 20 mA before setting X0.
Fig. 3: Adjusting range PA of I/H converter
I/H converter type DSG-B03212 DSG-B07212
Pressure adjusting range
PA [bar]
0..3 1..7
Adjusting range approx.
PAmax [bar]
at setpoint w = 20 mA
1..35..7
Adjusting range approx.
PAmin [bar]
at setpoint w = 4 mA
0..0.8
0..2 1..3 1.5..5
The bold data for PAmin refer to the maximum set pressure PAmax.
6.2.2 Factory setting
The adjusting range of PA is assigned to the setpoint range 0/4...20mA according to the
order data.
X
0
Potentiometer X
0
is used to adjust the minimum output pressure PAmin at a
setpoint w of 0 mA or 4 mA. The output pressure increases by turning the
potentiometer clockwise.
X1Potentiometer X1
is used to adjust the maximum output pressure PAmax at a
setpoint w of 20 mA. The output pressure increases by turning the potentiometer
clockwise.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
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Version: 4.1
7 Operation

Working on the I/H converter is only allowed when using suitable tools intended for
hazardous areas!
7.1 Operation with manual operation knob
Operation with manual operation knob is possible without electrical auxiliary power.

Manual operation is only possible when the retaining clip on the ma
nual operation knob
was removed before.

On completion of operation with manual operation knob, move the manual operation
knob to its end position by turning it counterclockwise and lock it with the circlip.
•Remove circlip.
•Slowly turn the manual operation knob clockwise and observe the output pressure. The
output pressure PA increases. Its maximum corresponds to input pressure P.
7.2 Normal operation
During normal operation, the I/H converter is operated with an external setpoint. If the I/H
converter does not work as expected, normal operation is interrupted. To remedy the
malfunction, troubleshooting activities are required.

On operation with manual operation knob, uncontrolled stroke movements of the
components that are controlle
d by the I/H converter output may occur due to the
increase of the output pressure.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
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Version: 4.1
7.3 Troubleshooting
Malfunction
Possible cause(s) Remedy
Pressure variations
Supply pressure too low Check supply pressure
Air pockets in
I/H converter Dur
ing first commissioning, air pockets in the control
magnet may cause pressure variations. De-
aerate the
I/H converter according to the information provided in
Chapter 6.1.
Impurities in
hydraulic component
Contaminated operating medium causes increased
f
riction at the control piston resulting in hysteresis and
pressure variations.
Open hydraulic component and clean inner parts. If
necessary, consult
J.M. Voith SE & Co. KG │ Division
Digital Ventures.
Pressure variations
in tank return line T2 Pressure v
ariations are not allowed in tank return line
T2. If other consumers are connected to this line,
ensure that these do not generate any pressure in the
line. If necessary, consult
J.M. Voith SE & Co. KG │
Division Digital Ventures.
Output pressure does
not
follow setpoint w:
PA = 0 bar or
PA ~ P
Blocking of control piston
The control piston may be blocked by a particle. The
blocking may connect the outlet with T1 or P, thus the
output pressure PA equals 0 bar or corresponds to
the input pressure. Open hydra
ulic component and
clean inner parts. If necessary, consult
J.M. Voith SE
& Co. KG │ Division Digital Ventures.
Defect in the control magnet
VRM
The control magnet is defective if the control piston
can be moved and the output pressure can be
adjusted with the manual operation knob (see
Chapter 7.1). Replace the I/H converter.
Please kindly contact J.M. Voith SE & Co. KG │ Division Digital Ventures if any type of malfunctioning
occurs which is not included in this table.

Prior to starting work, make sure that the I/H converter was installed electrically and
hydraulically according to the information provided in Chapter 5 and properly
commissioned according to the information provided in Chapter 6.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 19 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
8 Maintenance, Servicing, and Inspections

Any maintenance, servicing and inspection work is only allowed in non-hazardous
atmosphere.

For trouble-
free and reliable operation of the I/H converter, inspection, maintenance and
servicing are necessary and need to be performed in certain intervals.

The intervals indicated apply to I/H converter operation and proper use within the
permisible operating conditions. For continuous operation in extreme ranges, shortening
of the intervals is recommended.
8.1 Maintenance and servicing

Combustible dusts may cause fire or explosion. Therefore, immediately remove any
deposit of combustible dusts on the I/H converter!
Maintenance intervals
Maintenance work
Routine inspection
Check pipes, pipe unions and connections on the I/H converter for leaks,
impurities and damage.
Remedy any leaks, impurities and damages detected , as required, during
appropriate operating phases.
Monitor the I/H converter operating behavior for any changes (e.g. noise).
Analyze and eliminate the causes, as required, during appropriate
operating phases.
Inspection after approx. 740
operating hours or 1x per month
Take an oil sample from the oil tank and check it for solid and suspended
matters, water content, change of color and air bubbles. Check the oil
sample for oil cleanliness.
Check and change the oil, as required, during appropriate operating
phases.
Inspection afte
r approx. 8000
operating hours or 1x per year
Take an oil sample from the oil tank and analyze it chemically.
Check and change the oil, as required, during appropriate operating
phases.
Check the electrical connections of the I/H converter and retighten them,
if necessary.

These inspection works can be performed by the operator's expert personnel, provided
they meet the relevant criteria stated in Chapter 2.3.

Installation and Operating Manual
I/H Converter DSG-B03212
DSG-B07212
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 20 / 22
918 3626018861 en
D – 74564 Crailsheim
Version: 4.1
8.2 Inspections
Inspection intervals
Inspection work
Within the scope of the regular
plant inspection
Check I/H converter, pipes, pipe unions and connections on the I/H
converter for leaks, impurities and damage.
Remedy any leaks, impu
rities and damages detected , as required, during
appropriate operating phases.
Monitor the I/H converter operating behavior for any changes (e.g. noise).
Eliminate the causes, as required, during appropriate operating phases.
Inspection works after 60,000
operating hours, 7 years after first
commissioning at the latest
Remove the I/H converter from the machinery and disassemble same in
an appropriate workshop. Inspect the inner parts and replace
conspicuous parts. Replace all seals.
Perform a test run on a suitable test stand; check and document the I/H
converter operational behavior.
Inspection works after another
60,000 operating hours, 7 years
after the l
ast inspection at the
latest
Remove the I/H converter from the machinery and have it inspected and
completely overhauled at J.M. Voith SE & Co. KG │ Division Digital
Ventures, Crailsheim. All the conspicuous parts will be replaced. By
performing a test run, the operating behavior will be checked and
documented.
8.3 Spare parts information

It is only allowed to install original Voith parts.

The manufacturer only is able to guarantee an expert repair and/or maintenance.

These inspection works
can be performed by the operator's expert personnel, provided
they meet the relevant criteria stated in Chapter 2.3.

These inspection works must only be performed by the operator's trained expert
personnel in an appropriate workshop or by Voith personnel at the Voith workshop.
(See Section 2.3.)

Only J.M. Voith SE & Co. KG │ Division Digital Ventures expert
personnel are
exclusively allowed to perform these inspection works. Removal of the I/H converter is
performed by the operator's expert personnel according to Chapter 2.3.

For del
iverable spare parts, please refer to the spare parts catalog of the outline
drawing (see Chapter 10). In case that required parts are not included, please contact
J.M. Voith SE & Co. KG │ Division Digital Ventures, Crailsheim.

Storage of spare parts is only allowed if these are protected against corrosion. The
storage area has to be dry and free from dust. Prior to installing the parts, remove the
corrosion protection.

Do not store the elastomere seals together with chemicals, solvents, fuels, acids, etc.
They need to be packed airtight and protected against light with a high content of UV
rays. The storage time until the I/H converter gets used must not exceed 6 years (for
NBR) and 10 years (for FPM).