Resistor braking
119
Resistor braking
What this chapter contains
This chapter describes how to select, protect and wire brake choppers and resistors.
The chapter also contains the technical data.
To which products this chapter applies
This chapter applies to the ACS800-01/U1 (frame sizes R2 to R6), the ACS800-02/
U2 (frame sizes R7 and R8), the ACS800-04/U4 (frame sizes R7 and R8) and the
ACS800-07/U7 (frame sizes R6, R7 and R8).
Availability of brake choppers and resistors for the ACS800
Frame R2 and R3 drives have a built-in brake chopper as standard equipment. For
frames R4 and up, brake choppers are optionally available as built-in units, indicated
in the type code by +D150.
Resistors are available as add-on kits. For the ACS800-07/U7, resistors are
available as factory installed.
How to select the correct drive/chopper/resistor combination
1. Calculate the maximum power
(P
max
) generated by the motor during braking.
2. Select a suitable drive / brake chopper / brake resistor combination for the
application according to the following tables (take account of other factors in the
drive selection also). The following condition must be met:
where
3. Check the resistor selection. The energy generated by the motor during a 400-
second period must not exceed the resistor heat dissipation capacity
E
R
.
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.
P
br
denotes
P
br5
,
P
br10
,
P
br30
,
P
br60
, or
P
brcont
depending on the duty cycle.
P
br
>
P
max
Summary of Contents for ACS800-02
Page 1: ...ACS800 Hardware Manual ACS800 02 Drives 45 to 500 kW ACS800 U2 Drives 60 to 600 HP ...
Page 4: ......
Page 10: ...Safety instructions 10 ...
Page 20: ...About this manual 20 ...
Page 26: ...The ACS800 02 U2 26 ...
Page 42: ...Planning the electrical installation 42 ...
Page 76: ...Installation checklist 76 ...
Page 106: ...Technical data 106 ...
Page 108: ...Dimensional drawings 108 Frame size R7 US gland conduit plate 64579746 H ...
Page 109: ...Dimensional drawings 109 Frame size R8 3AFE 64564161 D US gland conduit plate ...
Page 110: ...Dimensional drawings 110 Frame size R7 with enclosure extension bottom entry 64625942 1 2 B ...
Page 111: ...Dimensional drawings 111 64625942 2 2 C ...
Page 112: ...Dimensional drawings 112 Frame size R7 with enclosure extension top entry 64626264 1 2 C ...
Page 113: ...Dimensional drawings 113 64626264 2 2 C ...
Page 115: ...Dimensional drawings 115 3AFE 64626388 2 2 B ...
Page 116: ...Dimensional drawings 116 Frame size R8 with enclosure extension top entry 3AFE 64626370 1 2 C ...
Page 117: ...Dimensional drawings 117 3AFE 64626370 2 2 C ...
Page 118: ...Dimensional drawings 118 ...
Page 127: ......