Appendix: Resistor braking 405
19
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
Rmax
for the application.
P
Rmax
must be smaller than
P
BRmax
given in the table on page
for the used drive
type.
2. Calculate resistance
R
with Equation 1.
3. Calculate energy
E
Rpulse
with Equation 2.
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
Rmax
.
•
Resistance
R
must be between
R
min
and
R
max
given in the table for the used
drive type.
•
The resistor must be able to dissipate energy
E
Rpulse
during the braking
cycle
T
.
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...