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Dynamism means …

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Wiki brake resistor

Bimetal

Bimetal is where two metals are joined together. Bimetal elements are used in temperature switches, for example. As they heat up, both layers expand differently, which causes the bimetal strip to bend and open a contact. The signal can then be processed on the plant side.

Brems-Chopper

Als Brems-Chopper wird der elektronische Schalter in einem Frequenzumrichter bezeichnet, der den Bremswiderstand mit dem Gleichstrom-Zwischenkreis des Frequenzumrichters verbindet. …

Braking energy

Braking energy is the energy which is needed to convert the kinetic energy in a system into a different form of energy. This occurs in a brake resistor by converting electrical power into heat.

Braking power (Pbr)

The power required to brake a movement (e.g. a moving cable car) is called braking power.

Braking time (tbr)

The braking time describes the period in seconds in which a drive must be braked. The term “activation period” is often used in context with brake resistance.

Activation period (ED)

The activation period is derived from the relationship between braking time and cycle duration: A braking time/activation period of 48 seconds and a cycle duration of 120 would equal an activation period of 40 percent.

Electrical power (E)

Electrical power is energy caused by transformation, transmitted by means of electricity or stored in electrical fields. It causes, for example, lamps to light up and powers all sorts of machinery. Electrical power is measured in wattseconds (Ws), kilowatt hours (kWh) or joules (J).

Electrical output (P)

Electrical power is energy caused by transformation, transmitted by means of electricity or stored in electrical fields. It causes, for example, lamps to light up and powers all sorts of machinery. Electrical power is measured in wattseconds (Ws), kilowatt hours (kWh) or joules (J).

Continuous output (Pd)

If the braking time is more than 120 seconds this means that the output is continuous. An example of this is the downward motion of a cable car. In this instance, the brake resistor is designed to accommodate the braking power generated continuously during the braking time.

Short-term output

If the braking time is less than 120 seconds, the braking resistor can have a smaller design because it has enough time to cool down. Drives in machine tools represent a typical example of short-term output.

Dynamic mode

An electric motor can be motor-driven or dynamically operated. Motor-driven is where a load is raised and the motor consumes energy in the process (e.g.: lifting platform moves up). Dynamic operation is where the motor brakes a load and in doing so generates electrical power (e.g.: lifting platform powers the motor when it moves down under weight. This energy must be converted into heat by a brake resistor.

Dynamic energy

Dynamic energy is energy that a motor creates when it works as a generator.

IP protection class

The safety symbol consists of the letters “IP” (International Protection) followed by two numbers, for example “IP 23”. The first number stands for contact and foreign body protection and the second number stands for protection against water ingress.

Kelvin (K)

Kelvin is the international base unit of temperature. Since 1968, it is the legally defined temperature unit in the EU. A temperature of 0°C is equivalent to 273.15 K. This unit is used for power resistors to describe the temperature increase of the resistor in the case of an electrical load.

Characteristic

A characteristic illustrates the relationship between two physical factors, which distinguishes an item of equipment. For example, the relationship between current and voltage is described for a brake resistor.

Capacitor

A capacitor is a component that buffers an electrical charge in a DC circuit and stores power.

Load cycle

Load cycle describes a regularly occurring load that the brake resistor can heat up to its end temperature.

Frequency converter (FU)

A frequency converter is an electrical device that changes not only the frequency but also the voltage of the stored alternating current in such away that, for example, an electric motor can be powered. Among other things, the frequency converter controls the start-up of a motor when it starts and run-down when it stops.

Load cycle

Load cycle is the strain placed on a component, i.e. braking resistance, over a set period of time. The load cycle of a brake resistor usually consists of a braking phase followed by a cooling down phase.

Power density

Power density describes the distribution of power over a certain unit area. On a brake resistor, the power density determines its design.

Rated output

Rated output means the performance for which a machine, a device or a system is designed according to the manufacturer. When talking about power resistors this also implies the continuous output.

Rated current

For electrical equipment, the rated current refers to the highest permissible continuous current as well as the amperage when the equipment returns its rated output.

Ohm (Ω)

Ohm is the unit of measurement for electrical resistance.

Potential-free signal contact

Signal contacts report faults in heaters, smoke detectors or frequency converters. Potential-free means that the connections of the switch (input and output current circuit) are separated from each other like a relay.

Rotational energy (Erot)

Rotational energy describes the moving energy of a rigid body that circulates around a fixed point or a moving centre of mass.

Fuse

A fuse is installed to prevent an electrical device from suffering damage due to an overload. If the amperage exceeds a certain value, the fuse melts and causes an open circuit.

Cycle duration (tSD)

The cycle duration is the period of time from the first to the next braking operation in seconds. Included in the cycle duration are the braking time and also the break or pause.

Peak load

The peak load is where a high level of energy is required for a brief period.

Temperature coefficient

If the operating temperature of the resistor changes, the internal resistance value from brake resistors also changes depending on which resistance material is used. The temperature coefficient describes this relative change of the resistance value; it is given as ppm/°C.

Overload

Overload in terms of electronics denotes an elevated power draw that damages or ruins the assembly parts. A reason for this could be voltage fluctuations in the mains supply.

Overload capacity

The overload capacity indicates whether and how long a system can be operated above the maximum output.

Overcurrent

Overcurrent is the current that permanently exceeds a fixed amperage. This represents a hazard for the electrical device itself and also the surroundings because excessive heat build-up could cause a fire.

Watt (W)

Watt is the unit of measurement for power (P).

Resistance value (R)

The resistance value indicates the degree to which a certain resistance can impede an electrical current. It is given as ohms.

Intermediate circuit voltage

An intermediate circuit can convert mains voltage into a different voltage waveform. This might be necessary, for example, if various alternating current networks are not compatible with each other on account of their frequency or phasing. The intermediate circuit consists of a rectifier, intermediate circuit elements and a pulse positioner; the intermediate circuit voltage is derived from the interaction of these elements.

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