ABB ACS550-01 User Manual
Also see for ACS550-01: User manualQuick start guideInstallation supplementUser manualUser manual
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Contents
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230 ACS550 User’s ManualTechnical DataBrake ComponentsAvailabilityBraking availability for ACS550 drives, by frame size is:• R1 and R2 – a built-in brake chopper is standard equipment. Add appropriateresistor, as determined using the following section. Resistors are available fromABB.• R3…R6 – does not include an internal brake chopper. Connect a chopper and aresistor, or a brake unit to the DC link terminals on the drive. Contact your ABBrepresentative for appropriate parts.Selecting the Braking Resistors (Frame Sizes R1 and R2)Braking resistor must meet three requirements:• Resistance must be always higher than the minimum value RMIN defined for thedrive type in the following tables. Never use resistance below this value.• Resistance must be low enough to be able to produce the desired braking torque.To achieve the maximum braking torque (the larger of 150% of heavy duty or110% of nominal duty), the resistance must not exceed RMAX. If maximumbraking torque is not necessary, resistor values can exceed RMAX.• The resistor power rating must be high enough to dissipate the braking power.This requirement involves many factors:– The maximum continuous power rating for the resistor(s).– The rate at which the resistor changes temperature (resistor thermal timeconstant).– Maximum braking time ON – If the regeneration (braking) power is larger thanthe resistor rated power, there is a limit to the ON time, or the resistoroverheats before the OFF period begins.– Minimum braking time OFF – If the regeneration (braking) power is larger thanthe resistor rated power, the OFF time must be large enough for the resistor tocool between ON periods.– The peak braking power requirement.– Type of braking (deceleration to zero vs. overhauling load) – Duringdeceleration to zero, the generated power steadily decreases, averaging halfof the peak power. For an overhauling load, the braking is countering anexternal force (gravity for example) and the braking power is constant. Thetotal heat generated from an overhauling load is double the heat generatedfrom deceleration to zero speed (for the same peak torque and ON time).TimeBraking ONBraking OFFON Time OFF TimeCycle Time Cycle TimeON TimeDuty Cycle = |
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