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
.
Equations for selecting the resistor:
Eq. 1.
Eq. 2.
Eq. 3.
For conversion, use 1 hp = 746 W.
where
= calculated brake resistor value (ohm). Make sure that:
R
min
<
R
<
R
max
.
R
= maximum power during the braking cycle (W)
P
Rmax
= average power during the braking cycle (W)
P
Rave
= energy conducted into the resistor during a single braking pulse (J)
E
Rpulse
= length of the braking pulse (s)
t
on
= length of the braking cycle (s).
T
The tables below show reference resistor types for the maximum braking power.
IEC
Reference resistor types
P
BRmax
R
max
R
min
ACS580-01-…
kWohmohm
3-phase
U
n
= 230 V
Danotherm CBR-V 330 D T 406 78R UL0.72052504A7-2
Danotherm CBR-V 330 D T 406 78R UL1.11302506A7-2
Danotherm CBR-V 560 D HT 406 39R UL1.5952507A6-2
Danotherm CBR-V 560 D HT 406 39R UL3.04825012A-2
-4.13525018A-2
Danotherm CBT-H 560 D HT 406 19R5.42614024A-2
Danotherm CBT-H 760 D HT 406 16R7.41914032A-2
400 Resistor braking
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