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 typesP
BRmax
R
max
R
min
ACH580-01-
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
SAFUR90F57511136.0047A-2
SAFUR90F575169.06.0060A-2
3-phase U
n
= 400 or 480 V
Danotherm CBH 360 C T 406 210R0.68645202A7-4
338 Resistor braking
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