Note: If the E
R
value is not sufficient, it is possible to use a four-resistor assembly in
which two standard resistors are connected in parallel, two in series. The E
R
value of
the four-resistor assembly is four times the value specified for the standard resistor.
￭ Selecting a custom resistor
If you use a resistor other than the default resistor,
1. make sure that the resistance of the custom resistor is greater or equal than the
resistance of the default resistor in the rating table:
R > R
min
Resistance of the custom resistor
R
WARNING! Never use a brake resistor with a resistance smaller than R
min
.
The drive and the chopper are not able to handle the overcurrent caused by
the low resistance.
Resistance of the default resistor
R
min
2. make sure that the load capacity of the custom resistor is greater than the
instantaneous maximum power consumption of the resistor when it is connected to
the drive DC link voltage by the chopper:
P
r
< (U
DC
2
)/R
Load capacity of the custom resistor
P
r
WARNING! Never use a brake resistor with a resistance smaller than R
min
.
The drive and the chopper are not able to handle the overcurrent caused by
the low resistance.
Drive DC link voltage during braking
U
DC
660…690525…600500440…480380…415208…240Supply voltage range
(V AC)
11591008806806697403Drive DC link voltage
during braking (V DC)
when internal brake
chopper at 100% pulse
width
See ACS880 primary control program Firmware manual (3AUA0000085967 [Eng-
lish]) for more information.
Resistance of the custom resistor
R
264 Resistor braking
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