Monitoring technique
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Monitoring technique - 1

Monitoring technique Technique de sécurité

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Safety switching devices Standstill / speed monitoring Multifunctional safety devices Wireless Safety System Safety switches Guard locks Key transfer ■ Residual current monitors ■ Insulation monitors ■ Insulation fault location system ■ Measuring and monitoring relays ■ Fault annunciators and fault annunciator systems ■ SMS-Telecontrol module Solid-state relays /- contactors Reversing contactors Softstarters Motor brake relays Speed and phase controllers Multifunctional motor control units Latching / interface / switching relays Interface modules Power supply units I / O modules CANopen...

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Machinery and plant Power generation/distribution Oil and gas industry Automation Transport and material handling systems Rail technology Aviation/marine industry Paper and printing industry Food industry Rubber/plastics industry Heating and refrigeration Automotive Mining/metal working Chemical/pharmaceutical applications Medical technology Water/waste water treatment Cable cars/ski lifts ... and wherever safety has high priority. We can cover your industrial applications as well!

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The DOLD philosophy, “Our experience. Your safety” constitutes our program: Offering solutions based on over 80 years of experience with a workforce of more than 400 employees, we manufacture high quality products using state-of-the-art production plant at our Furtwangen facility in Germany. The comprehensive product range includes relay modules, safety relays with positively-driven contacts and electronic housings with virtually unparalleled production detail. The combination of know-how, innovation and experience makes us one of the leading worldwide manufacturers. Apart from standard...

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VARIMETER IMD - Electrical safety for power supplies An unplanned machine or system downtime due to insulation faults can have serious consequences. Through early recognition of such faults in ungrounded networks (IT networks), DOLD insulation monitors in the series VARIMETER IMD prevent failures in electric systems and guarantee a higher level of operational and system safety. VARIMETER EDS - Fault localization , during ongoing 1 operations In large industrial facilities, localizing insulation faults can be both expensive and time consuming. The VARIMETER EDS insulation fault search...

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Custom-tailored measuring and monitoring solutions. from DOLD Electrical Safety Solutions DOLD offers a comprehensive selection of measuring and monitoring relays for your unique needs. The devices detect and provide early notification if critical limits of electrical variables such as current, voltage, power, insulation resistance, et cetera are violated. This allows dangers to people and machinery to be reliably avoided. In addition, the availability of your machines and systems will be increased and production outages will be minimized. DOLD’s portfolio ranges from standard devices for...

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Table of contents Function Insulation monitors

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Table of contents Function

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Alphabetical index Type

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Alphabetical index Type

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Alphabetical index Type

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Function index Function

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Function index Function Underload monitor Phase monitor with Underload monitor Underload monitor Phase sequence monitor R Residual current monitor, Residual current monitor, Undervoltage relay Residual current monitor, Undervoltage relay, Voltage and frequency monitor

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NC = normally closed contact, NO = normally open contact, C/O = changeover contact

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NO = normally open contact, C/O = changeover contact

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NC = normally closed contact, NO = normally open contact, C/O = changeover contact

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NO = normally open contact, C/O = changeover contact

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NO = normally open contact, C/O = changeover contact, T = transistor output

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A = energized on trip, R = de-energized on trip

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Monitoring hardware DOLD's monitoring relays such as insulation monitors, differential-current monitors and measuring relays reliably monitor electrical quantities such as current, voltage, power, resistance, etc. and annunciate fault conditions and disturbances. Thus, these products protect also complex systems and ensure an optimal production flow. LEDs on the front provide visual status indications. Output contacts or interfaces for bus systems allow a further transmission of information from these devices, e.g. to fault annunciators. Phase ■ Voltage ■ Phase failure / Asymmetrie ■ Broken...

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Insulation monitor Non-earthed (IT) systems Insulation monitor Differential-current monitors Insulation monitors are used in non-earthed systems (IT systems). They measure the insulation resistance against earth of the system to be monitored. Such systems are protected by insulation monitors the use of them in IT systems is required by law by the norm “Safety of Machinery” DIN EN 60204-1 or DIN VDE 0100-410. Thanks to the deliberately kept simple functionality of insulation monitors from DOLD customers benefit from a considerable cost advantage combined with the high quality standard...

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Measuring relays Basics of monitoring technology in low voltage systems What means asymmetry (unbalance) in three-phase systems? The most common system is the 400 V three-phase system (fig. 1) formed from three alternating voltages that are displaced in time by 120° el. (fig. 2). Between the phases L1, L2, and L3, there are 3 phase-to-phase voltages UL1-L2, UL2-L3, UL3-L1 that are also referred to as line-to-line voltages. Graphically represented in a phasor diagram, these voltages result in an isosceles triangle (fig. 3). This type of representation is common in electrical engineering to...

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Measuring relays At first, the case of a broken neutral conductor is considered. As shown in fig. 4, the phase-to-neutral voltages can reach dangerously high values, up to the magnitude of the phase-to-phase voltage in extreme cases. It is clear that this would damage or destroy connected loads. Such overvoltages are a consequence of a severe unbalance as is encountered frequently in private or commercial systems. This is due to the fact that the electrical devices used there are mainly single-phase consumers with different power consumptions. Although attention is paid in building...

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