Service Certificates HEIDENHAIN milling controls
(PDF, 2.6 MB)

Service Certificates HEIDENHAIN turning controls
(PDF, 2.2 MB)

Service Certificate Kovosvit MAS machines
(PDF, 0.9 MB)

CNC TECHNOLOGIES & AUTOMATION
service.cnc[at]esd.bg

SERVICE AND SUPPORT
(Broshure, PDF, 2.4 MB)

The service maintenance of our industrial products is organized in the same principles, as those under which are working all service centers of our partners all over the world. For a country with a small territory, like Bulgaria, the most advisable service organization, with a view to the product application under important and critical situations, it is the centralized service. In this way spare parts supply and their availability is facilitated in maximum. Therefore we could be able to ensure in the best way the uninterrupted machinery work of our clients.
– Our team of experts are with long-lived industry experience
– Our technicians are in factory trained
– Convenient service options:
Field Service
Depot Repair
Express Exchange
Spare Parts
Available special service and test equipment

– Versatile coverage options:
Installing of a new CNC controls / controllers
Replacement of a old CNC controls / controllers with new ones
PLC programming for CNC controls / controllers
Commissioning and optimization of digital drives
Startup Assistance
Option Fitting
NC-programming training
CAD-design of electrical diagrams and cabinets
Assembling of electrical cabinets and machine electrical circuits mounting

WE ARE HERE FOR YOU FOR THE FOLLOWING SITUATIONS:

RESPONCE TIME
We Work Harder To Keep You Running. We have a relatively huge spare parts stock in Sofia for your urgently needs. In case of machine brakedown we do our best to rebuild the machine in less than 24 hours (in standard weekly work time). In case of needs we can deliver virtual any spare parts from our parners from Europe in maximum 24 hours.

Rapid Responce is Standard. Because we have factory trained technicians to support your service needs. Our technicians are CNC experts with long-lived industry experience.
MONDAY 9,00h (Sofia’ time – GMT+02:00) You phone or send via this web site inquiry for service with the product’s serial and identification numbers and description of your problem situation.
MONDAY 10,00h Within one (1) hour either the problem is solved or you have received (by phone, e-mail or fax) an confirmation for Return of Materials to ESD Bulgaria or you have a scheduled with an on-site Service Tech.
TUESDAY 17,00h Repaired and running smoothly in 15 business hours* or less!

* Valid for current product programs of our partners and available spare parts in Bulgaria.

SPARE PARTS AND AFTER-SALES SERVICE
Thanks to an exemplary spare parts management, ESD Bulgaria offers a wide assortment of wear and spare parts both for the current and obsolete product ranges. In case of need, such parts can be dispatched within a few hours only.

ESD Bulgaria offers various services, comprising accomplishment of repair work, relocation of components of the current and obsolete product ranges as well as supply of technical documentation.

The full force of our organization is dedicated to meeting your needs:
Dispatch personnel
Certified field engineers
Product managers
Available special service and test equipment
Spare parts coordinators
Experts with long-lived experience

We can support CNC systems manufactured by:

HEIDENHAIN
ALL CNC MODELS: for example TNC 135, 145, 410, 426, 430, 355, 155, 335, 407, 415, 425, 223, 332, 234, CNC model Deckel MillPlus, MillPlus IT, Contour 3PH, TNC 310, TNC 320, iTNC 530, etc.

GRUNDIG numeric
CNC models: CNC Pilot 1190, 1290, 1230, 1150, 3110, 3190, MillPlus, Dialog 12, MANUALplus, 3190, GILDEMEISTER DataPilot TurnPlus, etc.
In 1997 GRUNDIG numeric has been taken over by HEIDENHAIN.

PHILIPS
CNC model 3000, 3360, 3460, 5000, 432/10, 432/9, 532. GILDEMEISTER CTX 500, CT 20/40/41/60EPL1/EPL2, etc.
In January 1993 PHILIPS numerical controls division has been taken over by GRUNDIG numeric.
Rexroth / Indramat All CNC models and servo drives: series TDM, TDA, KDS, DKR, EcoDrive, RefuDrive, IndraDrive, etc.

ELGO Electric
ALL MODELS digital readouts and position controllers.

We can support measuring systems manufactured by:
HEIDENHAIN
ALL MODELS measuring systems: sealed linear encoders LS, LB, LC, LF; exposed linear encoders LIDA, LIM, LIP, LIF; rotary encoders ROD, ERN, ROC, ROQ, ECN, EQN, ERO, ECN, EQN; angle encoders RCN, RON, ECN, ROD, ERA, ERO, etc.

ELGO Electric
ALL MODELS magnetic measuring systems (incremental and absolute linear encoders, rotary encoders, etc.).

RSF Electronik
ALL MODELS digital readouts and measuring systems: sealed linear encoders, exposed linear encoders, rotary encoders, etc.
RSF Electronik is a HEIDENHAIN daughter company.

ACU-RITE
ALL MODELS digital readouts and linear measuring systems.
ACU-RITE is a HEIDENHAIN daughter company.

ANILAM
ALL MODELS digital readouts and linear measuring systems.
ANILAM is a HEIDENHAIN daughter company.

METRONICS
ALL MODELS digital readouts.
METRONICS is a HEIDENHAIN daughter company.

NUMERIK JENA
ALL MODELS linear and rotary measuring systems (encoders).
NUMERIK JENA is a HEIDENHAIN daughter company.

And many other similar products from different producers.

We can support CNC machines manufactured by:

Kovosvit MAS – Under world famous trade mark MAS the staff of the KOVOSVIT, joint stock company, which is a traditional Czech manufacturer and supplier of machine-tools, castings, technologies and services bring its customers solutions meeting their requirements.

TOS VARNSDORF a. s. situated in Varnsdorf, Czech republic has a years-lasting tradition in machine tool production. TOS VARNSDORF’s product program is based on horizontal milling and boring machines of medium class.

TAJMAC-ZPS is a complex firm and a strong contender in development and manufacture of machine tools: high efficiency machining centres and multispindle automatic lathes, as well as CNC sliding headstock turning machines.

AVIA is a traditional producer of turning and milling centers with CNC, universal and CNC milling machines, and ball screws as well.

TRENS is the bigest producer of metal cutting ma[ines in Slovakia and one of the most important in Central Europe. In the TRENS’s production program are universal lathes, CNC universal lathes and CNC lathes.

TOS OLOMOUC is a Czech manufacturer of milling machines for export.

ALZMETALL – Since 1945 ALZMETALL is committed to manufacture in Altenmarkt, close to the lake ‘Chiemsee’, drilling machines, special purpose machines and vertical machining centres.

Unisign is The Netherland’s manufacturer of high-performance and precise machines for processing of large parts: portal with movable column, multitasking, specialized.

And many other machines from different machine producers.

RETROFIT / MACHINE MODERNIZATION – AN ECONOMIC ALTERNATIVE

Modernization of your machines, also called retrofitting, is the solution when it comes to giving your machine park a new life. We can help you get your machines back in top shape. In most cases, the mechanics is still in a good or very good condition, but the controller and drives are worn out, resulting in increasingly frequent failures and more and more trouble getting spare parts.

In practice, this means:

Replacement and reinstallation of CNC controls and/or drives of the latest generation, irrespective of the technology used before
Replacement and reinstallation of new generation motors and servo drives
Repair or mounting of linear, rotary and angle position encoders
Assembling of electrical cabinets and machine electrical circuits mounting
Mechanical reworking and modernization of the complete package, if necessary.

RETROFIT ADVANTAGES
Depending on the equipment you need and on the degree of conversion, you can achieve the following main advantages:

Increased productivity by reducing the standstill and downtimes and through faster machining cycles when machining complex parts
Higher quality through higher accuracy and simple operation and programming
Greater ease of operation and programming
Faster machining cycles when machining complex parts
Greater precision
Spare parts supply guaranteed for a long period of time
Reliable and safe data management
Larger memory capacity
Networking and CAD link options.

EMC MEASURES FOR DESIGN AND INSTALLATION.

Rules for Design of Installations with Drive Controllers in Compliance with EMC
(Download brochure, PDF, 2.3 MB)

The following rules are the basics for designing and installing drives in compliance with EMC:

All metal parts of the cabinet have to be connected with one another over the largest possible surface area to establish a good electrical connection. This, too, applies to the mounting of the EMC filter. If required, use serrated washers which cut through the paint surface. The cabinet door should be connected to the cabinet using the shortest possible grounding straps;
Ensure a spacing of at least 100 mm between power cables and control or signal cables (e.g. encoder cables), or Partition cable ducts metallically. Route signal lines separately from load lines to avoid interference;
Contactors, relays, solenoid valves, electromechanical operating hour counters etc. in the control cabinet must be provided with interference suppression combinations. These combinations must be connected directly at each coil;
Non-shielded cables belonging to the same circuit (feeder and return cable) have to be twisted or the surface between feeder and return cable has to be kept as small as possible;
Generally, interference injection are reduced by routing cables close to grounded sheet steel panels. For this reason, cables and wires should not be routed freely in the cabinet, but close to the cabinet housing or mounting panels;
Lines of measuring systems have to be shielded. The shield has to be connected to ground at both ends and over the largest possible surface area. The shield may not be interrupted, e.g. using intermediate terminals;
The shields of digital signal lines have to be grounded at both ends (transmitter and receiver) over the largest possible surface area and with low impedance. Bad ground connection between transmitter and receiver requires additional routing of a bonding conductor (min. 10 mm2). Braided shields are to be preferred to foil shields. The shields of analog signal lines generally have to be grounded at one end (transmitter or receiver) over the largest possible surface area and with low impedance, in order to avoid low-frequency interference current (in the mains frequency range) on the shield;
Correctly use a mains filter recommended by producer for radio interference suppression in the supply feeder of the AC drive system. The incoming and outgoing cables of the radio interference suppression filter have to be separated;
Preferably use the motor power cables with shield. Keep length of motor power cable as short as possible. Ground shield of motor cable at both ends over the largest possible surface area to establish a good electrical connection;
The shield of the motor cable mustn’t be interrupted by mounted components, such as output chokes, sine filters, motor filters.

PROTECTION OF SERVO INVERTER SYSTEMS WITH FAST SEMICONDUCTOR FUSES
To ensure adequate protection, servo inverter systems must be installed so that they are connected via fast semiconductor fuses as specified in the Technical Manuals. Slow-blow fuses are by no means permissible for inverter systems. If such fuses are nevertheless used, a short-circuit in the dc-link of a power module might result in the destruction of the power supply unit. The use of fast semiconductor fuses prevents the destruction of the power supply unit. If a short-circuit in the power modules causes damage to power supply units which were not protected as required by HEIDENHAIN, Rexroth, Siemens etc. it is the customer’s fault.
For example, the following fuses must be used:
SIBA, typ gRL or
SIEMENS, typ Sitor gR.

Lightning Protection Zones Concept and Surge Protective Devices for power supply systems and equipment (CNC and servo systems)
(Download brochure, PDF file, 2.7 MB)

Lightning Protection Zones Concept
Failures of technical systems and installations are very unpleasant for the operators. These require faultless operation from the equipment both under “normal“ conditions and in case of thunderstorms. Loss reports of insurance companies show clearly that there is a backlog demand both in the private and the commercial sector. A comprehensive protection concept would help to compensate it. The Lightning Protection Zones Concept enables designers, constructors and operators to plan, perform and control protection measures. Thus, all relevant devices, installations and systems are protected reliably and furthermore with economically acceptable efforts.

Sources of interferences
Surges arising due to thunderstorms, are caused by direct / close lightning strokes or distant lightning strokes. Direct or close lightning strokes are strokes into the lightning protection system of a structure, into its immediate surroundings or into the conductive systems entering the structure (e.g. low voltage power supply, telecommunication and control lines…). Due to their amplitudes and energy loads, the arising impulse currents and impulse voltages represent a special risk for the system to be protected.

At a close or direct lightning stroke, the surges are caused by a voltage drop at the impulse earthing resistance and the resulting potential rise of the structure towards the distant surroundings. This is the max. load on electrical installations in structures.

The characteristic parameters of flowing impulse currents (peak value, rate of current rise, load, specific energy) can be described with the impulse-current wave form 10/350 µs and are defined in international, European and national standards as test currents for components and devices for the protection against direct lightning strokes.

In addition to the voltage drop at the impulse earthing resistance, surges arise in the electrical structure and the connected systems and equipment due to the induction effect of the electromagnetic lightning field. The power of these induced surges and the resulting impulse currents is considerably lower than the power of a direct lightning impulse current and is therefore only described with the impulse current wave 8/20 µs. Components and equipment, which do not have to conduct currents out of direct lightning strokes, are therefore tested with impulse currents of 8/20 µs.

Protection philosophy
Distant strokes are lightning strokes from a distance to the object to be protected, lightning strokes into the medium voltage overhead line network or into its immediate surroundings, or lightning discharges from cloud to cloud. In analogy to induced surges, the effects of distant lightning strokes on the electrical system of a structure are controlled by devices and components, which are designed accordingly for impulse current wave 8/20 µs. Surges due to switching operations (SEMP) are caused by e.g.:
– switching off inductive loads (e.g. transformers, coils, motors)
– ignition and interruption of electric arcs (e.g. arc welding device)
– tripping of fuses.
The effects of switching operations in electrical installations of structures are also emulated for test engineering with impulse currents of wave form 8/20 µs.
For ensuring a continuous availability of complex electrical and IT systems, even in case of a direct lightning effect, further measures for the surge protection of electrical and electronic installations are necessary, based on a building lightning protection system. Taking all causes of surges into consideration is very important. For this purpose, the Lightning Protection Zones Concept described in IEC 62305-4 is applied. A structure is subdivided in different risk zones. With these zones the necessary devices and components can be defined for lightning and surge protection. Part of an EMC-conform lightning protection zones concept is an external lightning protection system (including air-termination system, down-conductor system, earthing), equipotential bonding, spatial shielding and the surge protection for the power supply and IT systems.

In correspondence with the requirements and loads on surge protective devices regarding their installation site, these are classified as lightning current arresters, surge arresters and combined lightning current and surge arresters. The highest requirements regarding the discharge capacity are made on lightning current and combined lightning current and surge arresters, which realise the transition from Lightning Protection Zone 0A to 1 or 0A to 2

These arresters must be able to conduct partial lightning currents, wave form 10/350 µs, several times without destruction in order to prevent the penetration of destructive partial lightning currents into the electrical installation of a building. At the boundary from LPZ 0B to 1 or downstream of the lightning current arrester at the boundary from LPZ 1 to 2 and higher, surge arresters are used for protection against surges. Their function is to further reduce both the residual load of the upstream protection levels and limit the induced or own surges.

The aforementioned lightning and surge protective measures at the boundaries of the lightning protection zones apply to both power supplies and IT systems to the same extent. Due to the entirety of the measures described in the EMC-conform Lightning Protection Zones Concept, a permanent system availability of a modern infrastructure can be achieved.

Surge Protective Devices
Surge protective devices are items of equipment whose basic components are voltage-controlled resistors (varistors, suppressor diodes) and/or spark gaps (discharge paths). The function of surge protective devices is to protect other electrical equipment and installations against impermissibly high surges and/or to establish the equipotential bonding.

Surge protective devices are classified:
a) upon their application in
– Surge protective devices for power supply systems and equipment for nominal voltage ranges of up to 1000 V
• according to E DIN VDE 0675 Part 6:1989-11 in Ableiter (new: Ьberspannungs-Schutzeinrichtung) der Anforderungsklassen A, B, C, D – replaced by DIN EN 61643-11 from October 2004
• according to EN 61643-1:1998-02 in SPD Type 1/2/3
• according to IEC 61643-1:1998-02 in SPD class I / II / III
– Surge protective devices for IT systems and equipment for protection of modern electronic systems in telecommunications and signal-processing networks with nominal voltages of up to 1000 V ac (root-mean-square value (rms)) and 1500 V dc against indirect and direct effects of lightning strokes and other transient surges.
• according to IEC 61643-21:2000 + Corrigendum:2001, EN 61643-21:2001 and DIN VDE 0845 Part 3-1.
– Isolating spark gaps for earth-termination systems or for equipotential bonding.
b) upon their impulse current discharge capacity and their protective effect in
– Lightning Current Arresters for interferences due to direct or close lightning strokes for protection of installations and equipment (for use at the boundaries of Lightning Protection Zones (LPZ) 0A and 1).
– Surge Arresters for distant lightning strokes, switching overvoltages as well as electrostatic discharges for protection of installations, equipment and terminal devices (for use at the boundaries downstream of LPZ 0B).
– Combined Lightning Current and Surge Arresters for interferences due to direct or close lightning strokes for protection of installations, equipment and terminal devices (for use at the boundaries between LPZ 0A and 1 as well as 0A and 2).

Technical data of surge protective devices
The technical data of surge protective devices comprise information defining the application conditions upon:
– application (e.g. installation, mains conditions, temperature)
– performance on interferences (e.g. impulse current discharge capacity, follow current extinguishing capability, voltage protection level, response time)
– performance during operation (e.g. nominal current, attenuation, insulation resistance)
– performance on failure (e.g. backup fuse, disconnection device, failsafe function).

MORE INFO
For complete products information, Please, visit producers’ web sites or contact directly our CNC Department by e-mail cnc@esd.bg.

Thank you!

The information is abailable only in Bulgarian language.