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Options - Altivar Process 900 Variable Speed Drives Page 47



Variable speed drives

Altivar Process ATV900

Option: Braking resistors



Presentation: page 8 Variable speed drives: page 18 Configuration and runtime tools: page 28 Combinations: page 32 Dimensions: page 76


Braking resistors allow Altivar Process drives to operate while braking to a standstill, by dissipating the braking energy. They enable maximum transient braking torque. Braking resistors are designed to be located outside the enclosure, but should not inhibit natural cooling. Air inlets and outlets must not be obstructed in any way. The air must be free of dust, corrosive gas, and condensation. Several resistor models are available, depending on the drive rating: b With IP 20 and IP 23 casing and thermal protection provided by temperature- controlled switch or by the drive The internal circuits of Altivar Process drives rated 90 kW or less have a built-in dynamic brake transistor. An external braking unit is necessary for wall-mounting Altivar Process drives between 110 kW and 315 kW at 400...480 V as well as 55 kW and 75 kW at 200...240 V. Applications Braking resistors are designed for a defined cycle (see the 3 cycle types defined below). Depending on your own applications and cycles, you can use these resistors or define a new value. b Braking resistors for light braking cycles for machines with cycles and inertia. The braking power is limited to 1.5 Tn for 0.8 s every 40 s. b Braking resistors for medium braking cycles for machines with high inertia and conveyors. The braking power is limited to 1.35 Tn for 4 s every 40 s. b Braking resistors for severe braking cycles for machines with very high inertia and vertical movements (hoisting). The braking power is limited to 1.65 Tn for 6 s and Tn for 54 s every 120 s.

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