Braking Resistor Selection; Single Braking Resistor - ABB ACSM1 System Manual

26

Braking resistor selection

Resistor(s) should be selected according to regenerative power
requirements. The following conditions must be fulfilled.

Single braking resistor

•
•
•
•
The resistance must be at least R
data of the ACSM1 drive module
The selected resistance value R
power requirements. In the following calculations the value of U
840V DC.
< <
R R
•
min br
The selected braking resistor should be able to handle the braking
energy generated in fast dynamic situations (time is just few seconds).
<
P dt E
•
gen R
where E is the energy pulse rating of the selected resistor.
R
The nominal power rating of the resistor must be adequate for the
average regenerative power.
<
• P P
gen , ave N R ,
where P is the nominal power rating of resistor (steady state
N,R
continuous load). For more detailed analysis (and more optimum
selection) the pulse load curves of the selected resistor should be
studied.
according to braking chopper
br,min
should also fulfil the peak braking
br
( )
2
U
dc
P
gen ,max
is
dc