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