ABB ACS550 Drive VFD Brake Chopper – Built-in up to 11 kW(Frame sizes R1 to R2 are delivered with integrated brake
choppers as standard.)
- Drive current rating with 3.3A to 23A comes with in-built brake chopper.
- Drive power rating 1.5 KW to 11 KW comes with in-built brake chopper.
- Frame size R1 and R2 comes with in-built brake chopper.
Braking availability for ACS550 drives, by frame size is:
- R1 and R2(1.5 KW to 11 KW) – a built-in brake chopper is standard equipment. Add appropriate resistor, as determined using the following section. Resistors are available from ABB.
- R3…R6 (15 KW to 160 KW) – does not include an internal brake chopper. Connect a chopper and a resistor, or a brake unit to the DC link terminals on the drive. Contact your ABB representative for appropriate parts.
ACS550 drive brake resistor detail
Symbols
R(MIN) – Minimum allowed resistance of the braking resistor.
R(MAX) – Maximum resistance allowed if maximum braking torque is necessary.
P(rx) – Duty-cycle based resistor power rating in deceleration braking, where “x” is
ON MAX time
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 the drive 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 or 110% of nominal duty), the resistance must not exceed RMAX. If maximum braking 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 time constant)
- maximum braking time ON – If the regeneration (braking) power is larger than the resistor rated power, there is a limit to the ON time, or the resistor overheats before the OFF period begins.
- minimum braking time OFF – If the regeneration (braking) power is larger than the resistor rated power, the OFF time must be large enough for the resistor to cool between ON periods.
- the peak braking power requirement
- type of braking (deceleration to zero vs. overhauling load) – During deceleration to zero, the generated power steadily decreases, averaging half of the peak power. For an overhauling load, the braking is countering an external force (gravity for example) and the braking power is constant. The total heat generated from an overhauling load is double the heat generated from deceleration to zero speed (for the same peak torque and ON time).
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ABB ACS550 Drive VFD Brake Chopper
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