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Technical data 143
Resistor choice
P
av
is the value to use when assessing which brake resistor to use. However, a safety
margin of 1.25 times is recommended to ensure the resistor operates well within its
limits*, so:
Required resistor power rating = 1.25 × P
av
________________ W (watts)
The range of suitable brake resistors is shown in the following table. Choose the
resistor that has a power rating equal to or greater than the value calculated above.
WARNING!
The brake resistance must be 39
Ω
or greater to ensure the
drive’s maximum regeneration switching current (10 A) is not exceeded.
Failure to observe the minimum resistance could result in damage to the drive. See
Brake (X1)
on page
140
.
Dimensions of brake resistors are shown in
Brake resistors
on page
169
.
* The brake resistors listed in the table above can withstand a brief overload of 10
times the rated power for 5 seconds. Please contact ABB if larger power ratings are
required.
Part
Resistance
Power rating
RGJ139
39
Ω
100 W
RGJ160
60
Ω
100 W
RGJ260
60
Ω
200 W
RGJ360
60
Ω
300 W
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