Resistor Braking Using Frames R1I; Contents Of This Chapter; Using R1I; Planning The Braking System - ABB ACS880-104 Hardware Manual

Resistor braking using frames R1i...R4i
inverter modules

Contents of this chapter

This chapter deals with using the internal brake choppers of frame R1i...R4i inverter modules.
Using R1i...R4i modules for resistor braking
The internal brake choppers of frame R1i...R4i inverter modules can be used for resistor
braking of other modules. Brake resistors are available from ABB as add-on kits and must
be installed in separate cubicles; contact your local ABB representative for details.

Planning the braking system

• The continuous and maximum braking power ratings of individual inverter modules are
listed on Ratings (page 335)
The total continuous braking power of parallel-connected modules is calculated with
the formula
P = P
brcont brcont1
where P , P
brcont1
to smallest.
The total maximum braking power of parallel-connected modules is calculated with the
formula
P = P
brmax brmax1
where P , P
brmax1
to smallest.
• The resistance of the resistor must not be lower than R
any inverter module to its resistor must not exceed the heat dissipation capacity (E
of the resistor.
Resistor braking using frames R1i...R4i inverter modules 329
.
+ 0.8 × (P + P
brcont2 brcont3
, etc. are the P
brcont2 brcont
+ 0.7 × (P + P
brmax2 brmax3
, etc. are the P
brmax2 brmax
13
+ ...)
values of the connected modules from largest
+ ...)
values of the connected modules from largest
. The energy transferred by
min
)
R