Appendix: Resistor Braking; What This Chapter Contains; Planning The Braking System; Selecting The Brake Resistor - ABB ACS355 User Manual

Appendix: Resistor braking

What this chapter contains

The chapter tells how to select the brake resistor and cables, protect the system,
connect the brake resistor and enable resistor braking.

Planning the braking system

Selecting the brake resistor

ACS355 drives have an internal brake chopper as standard equipment. The brake
resistor is selected using the table and equations presented in this section.
1. Determine the required maximum braking power P
must be smaller than P
type.
2. Calculate resistance R with Equation 1.
3. Calculate energy E
4. Select the resistor so that the following conditions are met:
• The rated power of the resistor must be greater than or equal to P
• Resistance R must be between R
drive type.
• The resistor must be able to dissipate energy E
cycle T.
given in the table on page
BRmax
with Equation 2.
Rpulse
min
Appendix: Resistor braking 389
for the application. P
Rmax
390
and R given in the table for the used
max
during the braking
Rpulse
Rmax
for the used drive
.
Rmax