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:
where
Instantaneous load capacity of the custom resistor
P
R, inst
Drive intermediate DC circuit voltage.
1.35 · 1.2 · 415 V DC (when supply voltage is 380 to 415 V AC)
1.35 · 1.2 · 500 V DC (when supply voltage is 440 to 500 V AC) or
1.35 · 1.2 · 690 V DC (when supply voltage is 525 to 690 AC)
U
DC
Resistance of the custom resistor
R
Mechanical installation of resistors
All brake resistors must be installed outside the drive. Obey the resistor manufacturer’s
instructions.
Electrical installation
■
Measuring the insulation of the assembly
Obey the instructions given in section
Measuring the insulation of the brake resistor
■
Connection diagram
See section
Connecting the power cables (frame size 2 x R11) (page 87)
Resistor braking 189
Summary of Contents for ACS880-04FXT
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 04FXT drive module packages Hardware manual ...
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Page 86: ...M10 86 Electrical installation ...
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Page 160: ...Standard configuration IP00 UL Type Open 160 Dimension drawings ...
Page 161: ...Drive module with optional support brackets IP00 UL Type Open Dimension drawings 161 ...
Page 163: ...Mounting plate opening 3AXD50000038119 Dimension drawings 163 ...
Page 164: ...3AXD50000038119 164 Dimension drawings ...
Page 182: ... Declaration of conformity 182 The Safe torque off function ...
Page 183: ...The Safe torque off function 183 ...
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