Altivar Process 900 Variable Speed Drives Page 37 Options

37 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 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 Type 1 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. References for a light braking cycle For drives Degree of protection of the resistor Ohmic value at 20 C/ 68 F Average power available at 50 C/ 122 F (1) Quantity required per drive Reference Weight & kW kg/ lb Supply voltage: 200240 V or 380480 V 50/60 Hz ATV930U07M3 ATV930U07N4U40N4 IP20 100 0.1 1 VW3A7730 1.500/ 3.307 ATV930U15M3U22M3 ATV930U55N4U75N4 IP20 60 0.16 1 VW3A7731 2.000/ 4.409 ATV930U30M3U40M3 ATV930D11N4D15N4 IP20 28 0.3 1 VW3A7732 3.000/ 6.614 ATV930U55M3U75M3 ATV930D18N4...D30N4 IP20 16 1.1 1 VW3A7733 4.000/ 8.818 ATV930D11M3 ATV930D37N4...D45N4 IP20 10 1.1 1 VW3A7734 5.500/ 12.125 ATV930D15M3 ATV930D55N4 IP20 8 1.1 1 VW3A7735 5.500/ 12.125 ATV930D18M3D22M3 ATV930D75N4...D90N4 IP23 5 1.9 1 VW3A7736 18.000/ 39.683 ATV930D30M3D45M3 ATV930C11N4C...C16N4C IP23 2.5 3.2 1 - 21.000/ 46.297 ATV930C31N4C IP23 1.4 1.5 1 ATV930D55M3C...D75M3C IP23 1.4 1.5 1 VW3A7738 16.000/ 35.274 ATV930C22N4 ATV930C25N4C IP23 1.4 5.1 1 VW3A7748 29.000 69.934 (1) Load factor for resistors: The value of the average power that can be dissipated at 50 C / 122 F from the resistor into the casing is determined for a load factor during braking that corresponds to the majority of normal applications: - Normal duty: 0.8 s braking with a 1.2 Tn braking torque for a 40 s cycle - Heavy duty: 0.8 s braking with a 1.5 Tn braking torque for a 40 s cycle Overview, references Variable speed drives Altivar Process ATV900 Option: Braking resistors Overview: page 8 Variable speed drives: page 18 Configuration and runtime tools: page 22 Combinations: page 26 Dimensions: page 66 Light Cycle t = 40 s t1 = 0 s t2 = 0.8 s Tn1 = 0 Tn2 = 1.5 x Tn t: period Tn1: braking torque Tn2: braking torque Tn: nominal torque Percentage of rating Time t1 t2 t Tn2 Tn1 Torque Power Overview VW3A7741 PF151255

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