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EPM
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EPM Electrolytic starter (LRS) for slipring motors from 550 to 20,000 kW

EPM electrolytic starter can be used to start slipring motors from 500 kW to 20,000 kW. It will supply the power necessary to drive the motor by resistance variation. Smooth progressive acceleration Wide range of applications Rugged and reliable Customised for each application Reduced maintenance Description EPM electrolytic starter can be used to start slipring motors from 500 kW to 20,000 kW. It will supply the power necessary to drive the motor by resistance variation. Designed for controlled starting and speed control of large slipring motors in demanding applications, the EPM liquir...

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Number of consecutive starts Country of destination Description An EPM unit is made of: the electrolytic resistance contained within a tank complete with electrodes of a size rated for the specific kW rating. the MV enclosure housing the short-circuit contactor. the LV enclosure which contains the control system. Tank: The tank is manufactured with heavy duty sheet steel 30/10 to 50/10 mm gauge, and is normally supplied complete with lifting eye bolts Tank capacity and dimensions are determined by the motor rating. The tank is filled through a filling flap and emptied through valves...

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Operating principle The EPM rotor starter is normally used to control the starting of a slipring motor, and the starting current is generally limited to a maximum of 250% FLC. Optimal starting torque for each application is normally selected by the choice of the initial value of resistance. The principle of the EPM starter is that the resistance automatically varies during the starting pe riod. This type of starter is designed to provide the optimum starting characteristic, which results in smooth progressive acceleration to full load speed. It can also be used for speed variation and...

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supply voltage adjustment and a reduction of starting current and torque, purpose of the system. (see Why using a starter for slip ring motors) Sodium Carbonate concentration is defined according to the starter data, the driven machine data (such as necessary starting torque) and ambient conditions. The starter slowly decreases the resistance, ensuring a progressive starting of the driven machine, unlike step starting due to starters with fixed electrodes. At the end of the starting process, the resistance is short-circuited. Advantages of mobiles electrodes Some LRS manufacturers do not...

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Specifications Electrical features: Reference Maximum power Tstarter / Tnominal = 0.7 Maximum power of engine given for 1 start/hour and 3 consecutive starts from cold state. Different models exist to suit the power of the starter(s) and the inertia of the driven machine. The ranges of EPM starters given above are theoretical only, as ranges will depend on many further non negligible parameters such as starting conditions, starting time and cadenza, torque, type and load of the driven machine, ambient temperature… Rotor voltage between rings: 3,500 V max Standard starting times: 20, 30, 40,...

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synchronization of the movement of the two electrode assemblies, which are driven by a common geared motor. The two resistances are finally shorted out by a single four or six pole shorting contactor, at the end of the run-up period. EPM starter with heat exchanger An EPM starter equipped with a heat exchanger is suitable for applications requiring: - high starting cadenza - speed variation or permanent sliding of the engine An exchanging system can be mounted on any EPM started, with the addition of a regulation servo-motor and a heat exchanger. Heat dissipation and capacity are increased...

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Liquid rotor starter with mobile electrodes – Size 1 Liquid rotor starter with mobile electrodes – Size 2 Liquid rotor starter with mobile electrodes – Size 3 Liquid rotor starter with mobile electrodes – Size 4 Liquid rotor starter with mobile electrodes – Size 1 Liquid rotor starter with mobile electrodes – Size 2 Liquid rotor starter with mobile electrodes – Size 3 Liquid rotor starter with mobile electrodes – Size 4 Double Double Double Double tank tank tank tank Delivered in standard with: A complete steel tank (painted steel) with polypropylene compartments (one per phase), electrode...

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CSA and UL certification GOST certification Resistance ratio 100:1 instead of 50:1 Final insertion resistor Slip resistor Roof Cable glands Transformer for LV control cubicle (if 230 V / 50 Hz non available) PLC and programming

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