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 brake resistor
If you do not use an ABB resistor,
1.
make sure that the resistance of the custom resistor is greater than or equal
to the resistance of the default ABB resistor.
where
Resistance of the custom resistor
R
Resistance of the default resistor
Rmin
WARNING!
Never use a brake resistor with a resistance smaller than
R
min
. This will
cause overcurrent that will damage the brake chopper and the drive.
2.
make sure that the resistance of the custom resistor does not restrict the
braking capability needed, ie.
where
Maximum power generated by the motor during braking
Pmax
Drive intermediate DC circuit voltage.
UDC
1.35 · 1.2 · 415 V (when supply voltage is 380 … 415 V AC)
1.35 · 1.2 · 500 V (when supply voltage is 440 … 500 V AC) or
Resistance of the custom resistor
R
3.
make sure that the resistor can dissipate the energy transferred to it during
the braking:
•
Braking energy is not greater than the resistor heat dissipation capacity
(
E
r
) during the period specified. See the custom resistor specification.
•
The resistor is installed in a correctly ventilated and cooled space.
Otherwise the resistor cannot meet its heat dissipation capacity and
overheats.
4. make sure that the instantaneous load capacity of the custom resistor is
greater than the maximum power taken by the resistor when it is connected
to the drive intermediate DC circuit by the chopper:
244 Resistor braking
Summary of Contents for ACH580-31
Page 1: ... ABB INDUSTRIAL DRIVES ACH580 31 drives Hardware manual ...
Page 2: ......
Page 4: ......
Page 16: ...16 ...
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Page 39: ...Operation principle 39 ...
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Page 112: ...R3 1 7 N m 112 Electrical installation IEC ...
Page 113: ...R6 1 7 N m Electrical installation IEC 113 ...
Page 114: ...R8 1 7 N m 114 Electrical installation IEC ...
Page 130: ...R3 Max 250 mA 130 Electrical installation North America NEC ...
Page 131: ...R6 Electrical installation North America NEC 131 ...
Page 150: ...150 ...
Page 152: ...152 ...
Page 166: ... Fan arrow must point up 166 Maintenance ...
Page 212: ...212 ...
Page 214: ...R3 IP21 UL Type 1 3AXD50000028643 214 Dimension drawings ...
Page 215: ...R3 Option B056 IP55 UL Type 12 3AXD50000045321 Dimension drawings 215 ...
Page 216: ...R6 IP21 UL Type 1 3AXD50000037446 216 Dimension drawings ...
Page 217: ...R6 Option B056 IP55 UL Type 12 3AXD50000045351 Dimension drawings 217 ...
Page 218: ...R8 IP21 UL Type 1 3AXD50000147052 218 Dimension drawings ...
Page 219: ...R8 Option B056 IP55 UL Type 12 3AXD50000147052 Dimension drawings 219 ...
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Page 275: ...CMOD 01 multifunction extension module external 24 V AC DC and digital I O 275 ...
Page 276: ...276 ...
Page 282: ...282 CMOD 02 multifunction extension module external 24 V AC DC and isolated PTC interface ...