Resistor Braking; What This Chapter Contains; Availability Of Brake Choppers And Resistors; How To Select The Correct Drive/Chopper/Resistor Combination - ABB ACS800-U7 Hardware Manual

Resistor braking

What this chapter contains

This chapter describes how to select, protect and wire brake choppers and resistors.
The chapter also contains the technical data.

Availability of brake choppers and resistors

Brake choppers are optionally available as built-in units, indicated in the type code
by +D150.
Resistors are available as add-on kits or factory installed (+D151).

How to select the correct drive/chopper/resistor combination

1. Calculate the maximum power (P
2. Select a suitable drive / brake chopper / brake resistor combination for the
application according to the following tables (take account of other factors in the
drive selection also). The following condition must be met:
where
P
3. Check the resistor selection. The energy generated by the motor during a
400-second period must not exceed the resistor heat dissipation capacity E
If the E
resistors are connected in parallel, two in series. The E
times the value specified for the standard resistor.
Note: A resistor other than the standard resistor can be used provided that:
• its resistance is not lower than the resistance of the standard resistor.
WARNING! Never use a brake resistor with a resistance below the value specified
for the particular drive / brake chopper / resistor combination. The drive and the
chopper are not able to handle the overcurrent caused by the low resistance.
P > P
br max
denotes P , P , P
br br5 br10
value is not sufficient, it is possible to use a four-resistor assembly in which two standard
R
) generated by the motor during braking.
max
, P , or P depending on the duty cycle.
br30 br60 brcont
value of the four-resistor assembly is four
R
141
.
R
Resistor braking