E. Dold & Söhne GmbH & Co. KG
About us
Solutions for automation
DOLD is an internationally operating medium-sized family enterprise. It develops, manufactures and sells high-quality components along with complete solutions in the area of safe automation for facility and machine building worldwide.
DOLD has successfully managed to undergo continuous development: from paving the way as a pioneer in relay technology to being the leading industry representative for functional safety, electrical safety and drive technology in Europe. DOLD products are successfully utilized whenever people, machines or equipment must be protected from damage and whenever productivity requires enhancement.
For example, safety switching devices such as standstill, speed monitors and radio controlled emergency stop systems ensure the quick and dependable deactivation of facilities during hazardous situations for practically any industry. Safety switch and trapped key interlock systems allow for the wireless safeguarding of safety doors. Innovative monitoring solutions such as insulation monitors ensure high availability and guarantee that facilities are electrically protected.
Products & services
Residual current monitor RN 5883
Reliably detect fault currents The residual current monitor RN 5883 (type B) from the VARIMETER RCM family by DOLD detects fault currents with DC or AC components in earthed networks. Here, the differential current measurement is implemented via the ND 5015 external differential current transformer. With an installation depth of 71 mm, the RN 5883 is also suitable for use in installation consumer units and industrial cabinets. Residual current monitors (RCMs) measure and monitor differential currents or fault currents in earthed power supply systems. They are installed in systems in which a message rather than a shut-down is to be initiated in the event of a fault. In comparison to residual current breakers (or residual current devices - RCDs), which trip in the event of a defined fault current being measured and cause an immediate shut-down, residual current monitors indicate a fault current early and report a degradation of insulation via an output contact for example. The early detection of insulation faults along with preventative maintenance and repair outside operating hours allows unexpected downtimes for machines and systems to be avoided and this in turn avoids undesirable operational interruptions, property damage and high costs.
Insulation monitor RN 5897/020
Insulation monitoring for DC charging stations The number of electric vehicles is constantly increasing and will grow even faster in the future. This will also drive forward the expansion of the charging station infrastructure, as DC charging stations are the first choice when electric vehicles need to be charged in the shortest possible time. Electrical safety must be guaranteed during the charging process. For this purpose, an unearthed DC power supply system (IT-grid) with insulation monitoring is set up and monitored by means of an insulation monitoring device (IMD). The user must never be exposed to high voltages (up to 1000 V) at any time. The insulation monitor RN 5897/020 of the VARIMETER IMD family is used especially for DC charging stations according to the IEC/EN 61851-23:2014/AC:2016-06 standard and monitors the charging process from the charging station into the vehicle. The device is characterised by the short response delay of ≤ 1s, a rated voltage up to DC 1000 V with coupling device and the detection of asymmetrical as well as symmetrical insulation faults. The integrated voltage measurement ensures reliable detection of the insulation resistance in the IT grid. The insulation monitor also features a selftest. This takes place automatically after power-on and after every full operating hour.
Insulation fault location system RR 5886 / RR5887
Precise localisation of faults during operation The fault-detection process for insulation faults can become a costly and time-consuming process in extensive industry systems. The insulation fault location system of the VARIMETER EDS family from DOLD, consisting of a test current generator RR 5886 and the insulation fault search device RR 5887, monitors and locates insulation faults in a quick and safe manner in complex, isolated AC/DC mains (IT systems). The Modbus RTU interface allows a fast connection of the devices into existing bus systems. The corresponding current transformers ND 5017 work independent of each other. They are simply connected to the input channels of the fault locating module RR 5887, which also calibrates them. Insulation fault search devices can notably be used advantageously in complex and widespread power supply systems. Even computer centres, which are operated in unearthed mains (IT system) due to availability and insensitivity to disruption, benefit from the use of an insulation fault location system. Faulty electrical circuits can be found and removed quickly before a system break down with loss of data. The information about the location of the fault are visualised directly on the RR 5887 insulation fault search device. In addition the actual fault current values can be read, localised and visualised via Modbus. The insulation fault location system allows for automatic and quick pinpointing of faulty electrical circuits, thereby increasing reliability and system availability. You will very quickly recoup the purchasing costs for the insulation fault location system thanks to reduced maintenance costs and eliminated service interruptions. Some application examples include power plants, shipbuilding, traffic engineering, industrial systems, PV systems etc.
Multifunction measuring relay UG 9400 - with Modbus RTU
Trouble-free and economic operation of machinery and plant is greatly improved by the reliable and continuous monitoring of single and 3-phase mains. Especially for pumping stations, fan drives and signalling systems where preventive maintenance measures or early fault detection is indispensable. If different parameters have to be monitored simultaneously, the investment, maintenance, operating and installation costs will be increased. With the multifunction measuring relay UG 9400 from the VARIMETER PRO series, DOLD combines up to 9 monitoring functions in one device with a width of only 22.5 mm and also enables parameterisation and monitoring via Modbus. Depending on the requirements, the UG 9400 can simultaneously monitors the 3-phase mains for overvoltage/undervoltage, voltage unbalance, overcurrent/undercurrent, cos ij, active, apparent and reactive power, frequency and phase sequence. It can also be used in single-phase mains applications. The compact UG 9400 measuring relay, also has two output relays which can be configured independently for different parameters. Commissioning, parameter setting and monitoring is quick and easy via a Modbus RTU interface. This fieldbus connection saves wiring and offers extensive diagnostic options, which increase the reliability and availability of machinery and plant. In many applications, the simple integration of Modbus RTU enables cost effective central monitoring of measured electrical variables, especially in applications with complex and extensive plant.
Three-position enabling switch RE 6909 - Safe and ergonomic
When operating machines and devices there are operating modes and situations where the stay in hazardous areas is needed. In order to work safely even in these cases with increased danger additional measures are required. With the new three-stage enabling switch RE 6909 of the SAFEMASTER series, people are secured during commissioning, maintenance or setup. What is important here is the three-stage functionality. Only an actively operated middle position gives approval to a higher-level safe control. If the operator releases the three-stage enabling switch or pushes it through (panic function) he or she withdraws approval, thus releasing the safety-oriented switch-off. Thanks to its functional and ergonomic design, the enabling switch grants fatigue-free working and, due to its modular setup, many additional operating and control functions such as a start-stop control device, key switches and further buttons. The robust handheld terminal meets the IP65 requirements for use even in rough ambient conditions. With the new three-stage enabling switch RE 6909 of the SAFEMASTER series we are expanding our product range of wireless enabling switches and wireless emergency stop systems for the safety-oriented transmission of emergency stop and control functions by an ergonomic wired version.
Standstill monitor UG 6946
Safe sensorless standstill monitoring The safe sensorless standstill monitor UG 6946 from the SAFEMASTER S series detects the standstill of 3-phase and 1-phase motors independent of the direction of rotation. This means sensors such as encoders or proximity switches are not required. Access to the danger zone of a system is only possible by the enabling signal of the standstill monitor after the drive has been switched off and run down. In order to detect a standstill, the remanence voltage induced by the motor windings is evaluated and provides safe standstill monitoring up to Cat. 4 / PL e or SIL 3, even if the motor has already been switched off. Using a conventional release via a time control, dangerous movement could not necessarily be excluded. For the implementation of different operating modes, the standstill monitor UG 6946 also offers the possibility of bridging the standstill monitoring (muting). The simple integration into the machine and drive concept reduces the commissioning effort and costs and is particularly suitable for use in machine tools and woodworking machines, centrifuges and rolling drives. With a width of only 22.5 mm, the UG 6946 can be accommodated in the control panel even under tight space conditions allowing easy retrofitting. The device also offers two redundant safety contact paths and a forcibly guided signal contact.
Speed and standstill monitor UH 5947
More than just drive monitoring Regardless of whether the set-up operation must be monitored safely, protection via speed limitation is needed or a safety gate is released after detection of standstill - the speed and standstill monitor UH 5947 of the SAFEMASTER S series is the right choice for your application. The device can be operated via the 4 buttons on the front and the LCD display, thus enabling simple parameterisation. For example, the encoder type, speed limits per operating mode and delay times can be flexibly adapted to your application. During operation, the current speed values can be read directly at any time, which in particular makes commissioning easier. To prevent manipulation, the configuration can be protected against unintentional changes by means of a parameter lock after commissioning. For multiple use, the configuration can easily be transferred from unit to unit via interface. The device status or the current speed can further be processed by a control system via a semiconductor signal output. The speed and standstill monitor UH 5947 covers the combined application of encoder signals and PNP or NPN sensors. Alternatively, NAMUR sensor technology can be used as a device variant. The device can be used in temperature ranges from -20 to +60 degrees Celsius and up to heights of 4000 metres.
Speed and frequency monitor UH 6937
Safe, sensorless drive monitoring With the speed and frequency monitor UH 6937 from the SAFEMASTER S Series, DOLD offers an efficient, economic solution for safe, sensorless drive monitoring. Monitoring the output frequency of traction converters is just one of the many different ways to use this component. In case of over- or underfrequency, violation of the set window range or wrong direction of rotation the frequency monitor shuts off safely, proving its benefit over frequency converters with integrated safety functions in any application where simplicity, flexibility, and safety are required. As an additional protective measure, the device can be adapted to an application by pressing just a few buttons. With the appropriate wiring, the device can offer the safety functions STO (safe torque off), SOS (safe operation stop), SLS (safely limited speed), SSM (safe speed monitoring), SSR (safe speed range) and SDI (safe direction) in accordance with EN 61800-5-2. With the help of ergonomically shaped buttons on the front, and a lit LCD display, you can quickly and easily access parameters relevant for the application, such as monitoring functions, delay times, and frequency ranges for up to four operating modes – all without a PC.
Safety switch and trapped key interlock system
SAFEMASTER STS - The key to more safety Don‘t you wish you had a simple safety switch and trapped key interlock system to protect your dangerous working areas. If you are looking for a reliable, expandable, flexible and cost saving solution, then you have found the perfect product with our TÜV-approved system SAFEMASTER STS. The SAFEMASTER STS Program consists of modules that can be individually combined and adapted to your application. They combine the advantages of safety switches, interlocks and key transfer in one system. The modular design allows systems to be assembled out of several units, or to modify and expand existing systems as required. All mechanical interlocks can be utilised in machine and plant concepts without wiring. They provide an economic and reliable proctection in wide applications. With only a few single components, a number of individual interlock units can be assembled. The stainless steel units guarantee good stability. Extensive equipment allows a simple mounting.
Radio controlled safety system UH 6900 - In pair mode
The safety approved, bidirectional radio controlled safety system UH 6900 from the SAFEMASTER W series, is for the transmission of safety inputs such as E-stop and conventional control functions and offers great flexibility for the protection of hazardous areas. By implementing the latest radio controlled technologies, a high degree of availability, a wide range, and safety is achieved. Two safety zones can easily be connected wirelessly over a considerable distance. The main application areas include applications covering large areas and mobile applications such as fully automated conveyor systems and driverless transport systems. Simple and inexpensive retrofitting of existing safety systems can also be achieved wirelessly with this system. The device allows connection of up to 3 two-channel safety transmitters (E-stop, LC, safety gate, two-hand, etc.), simple configuration, and comprehensive sampling and diagnostic options. With the radio controlled safety system, you will have an automated safety solution that can be integrated wirelessly into various applications. The option to select between three operating modes (complete protected mode, cross mode, protected mode with connectable ratio control) allows the device to be quickly and reliably adapted to your individual application.
Radio controlled safety system UH 6900 - In group mode
The radio controlled safety system UH 6900 of the SAFEMASTER W series, consisting of one group controller and up to 255 group receivers for the safety-related, wireless transmission of emergency stop and control functions, offers more flexibility in safeguarding hazardous areas. High availability, long range and safety are achieved by implementing the latest radio technologies. With the group controller, several receivers can be safely switched off via a unidirectional, safetyrelated radio link. Furthermore, the controller can exchange message, control and status information with a receiving device. The devices enable the connection of up to 3 two-channel safety sensors (emergency stop, LC, safety door, two-hand etc.) and offer simple configuration as well as extensive evaluation and diagnostic options. The main areas of application include mobile applications such as fully automated floor conveyors and driverless transport systems. A simple and cost-effective retrofitting of existing safety systems can also be realized without wiring.
Configurable safety system - Modular and multifunctional
With the size of the plants and complexity of the safety requirements the number of safety devices increases in many applications. In addition logical functions need to be implemented when e.g. only parts of the whole system needed to be disconnected. The modular and configurable safety system SAFEMASTER PRO of DOLD monitors the safety circuits of your machines and plants simple, flexible and safe. The number of inputs and outputs of the central control unit can be amended by extension modules. In this way SAFEMASTER PRO can be configured very flexible to the actual application. The configuration of the TUEV approved system is done very simple on a PC with the free configuration software SAFEMASTER PRO Designer: Select safety functions, assign in and outputs and connect them comfortably by PC. Finally transfer the tested logic via USB cable to the safety controller. Ready!
Energy meter RL 9405
Energy management means the continuous monitoring, storage and evaluation of energy measurement data, thereby increasing the transparency of energy consumption and energy costs at all measurement levels. Only with a detailed overview of the energy consumers, the use of energy can be designed in a demandoriented and efficient manner and thus, for example, offering optimisation potentials. The energy meter RL 9405 of the VARIMETER PRO series is used to measure electrical parameters and energy consumption in 3-phase mains with neutral conductor. Voltages and currents are measured and evaluated continuously. A separate auxiliary voltage is not required. The device provides up to 50 characteristic values of the energy supply and that with a compact width of only 35 mm. The RL 9405 determines all energy consumptions and enables a breakdown by cause. The energy meter RL 9405 is predestined for use in manufacturing processes and IT data centres, to detect energy saving potentials and is especially suitable for the fulfilment of energy audits (DIN EN 16247-1) or energy management (ISO 50001). The galvanically separated Modbus RTU interface offers flexible options for processing information directly via a gateway or a higher-level control system (PLC) and passing it on via standardised interfaces.
Emergency stop module UF 6925
Compact safety just 17.5 mm wide The only 17.5 mm wide emergency stop module UF 6925 of the SAFEMASTER series monitors safety functions such as emergency stop or safety door safely and simply in nearly every application and is characterised by maximum safety for man and machine with minimum space requirement. The UF 6925 enables time-saving wiring by integrated front side push-in cage clamp terminals and also makes rapid assembly possible by simple snapping on to the DIN rail. Being only 17.5 mm wide, the space required in control cabinets is reduced by more than 20 %, as opposed to standard safety modules. Due to its 2-channel structure the device is designed for highest safety requirements up to cat. 4 / PL e or SIL 3 and is also suitable for use in furnace installations according to EN 50156-1 due to the redundant structure. Setting is carried out via switches on the back of the device and allows the selection of type of start and cross fault detection. The safety module is predestined thanks to its wide voltage range of DC 8 ... 36 V for a great variety of applications in machine and plant engineering and in mobile applications.
Enclosure series KV 4600
Modular and innovative enclosure system The electronic enclosure KV 4600 sets new standards in terms of modularity and functionality. All functions are integrated into the enclosure front, thus offering a high degree of flexibility for your electronics. The multifunctional, modular enclosure system with overall widths of 12.5 / 17.5 / 22.5 mm and further are particularly suitable for modern control and industrial IoT applications as well as a number of further applications - also applicable as single enclosure and stand-alone solution. Reduce your installation effort - with just a few enclosure components to the finished device. Increase your degree of automation - the push-in terminals meet the high requirements of the reflow soldering process. Individuality - customer-specific adaptations can be realized in a simple and cost-effective way.
Locking module ZRHC
Control functions on safety door DOLD extends the safety switch and key transfer system SAFEMASTER STS by a further safety switch with guard lock. Up to three command and indication functions can be easily integrated into these. SAFEMASTER STS thus combines the advantages of safety switches, guard locks, key transfer and command functions in a single system. This meets the highest safety requirements up to Cat. 4 / PL e or SIL 3. The integrated command and indication elements enable the simple integration of command, indication and emergency stop functions into both new and existing safety concepts. As a result, the SAFEMASTER STS system becomes a true control centre from which command functions, status displays, releases, main and maintenance entrances can be controlled. This means that control signals, such as emergency stop or acknowledgement of the safety guard, can be triggered directly at the access points of machines and systems. In addition to emergency stop buttons, illuminated pushbuttons as well as pushbuttons or selector switches are also available. Due to its very slim design, the robust and attractive fibre reinforced polymer (FRP) enclosure can be mounted on safety fences in a space-saving manner. The optional M23 plug connectors ensure fast commissioning and reduce wiring work to a minimum. The safety switch with guard lock is optionally available with auxiliary and emergency unlocking as well as with actuator of the medium coding stage.