ABB ACS800-U1 - Protection of Frame Sizes R2 to R5 (ACS800-01;U1); Protection of Frame Size R6

166 Resistor braking
Protection of frame sizes R2 to R5 (ACS800-01/U1)
It is highly recommended to equip the drive with a main contactor for safety
reasons. Wire the contactor so that it opens in case the resistor overheats. This is
essential for safety since the drive will not otherwise be able to interrupt the main
supply if the chopper remains conductive in a fault situation.
Below is a simple example wiring diagram.
Protection of frame size R6
A main contactor is not required for protecting against resistor overheating when
the resistor is dimensioned according to the instructions and the internal brake
chopper is in use. The drive will disable power flow through the input bridge if the
chopper remains conductive in a fault situation. Note: If an external brake chopper
(outside the drive module) is used, a main contactor is always required.
A thermal switch (standard in ABB resistors) is required for safety reasons. The cable
must be shielded and not longer than the resistor cable.
With Standard Control Program, wire the thermal switch as shown below. By default,
the drive will stop by coasting when the switch opens.
For other control programs, the thermal switch may be wired to a different digital
input. Programming of the input to trip the drive by “EXTERNAL FAULT” may be
needed. See the appropriate firmware manual.
ACS800
U1 V1 W1
L1 L2 L3
1
2
3
4
5
6
13
14
3
4
1
2
K1

Fuses
OFF
ON
Thermal switch
(standard in ABB
resistors)
1DI1
2DI2
3DI3
4DI4
5DI5
6DI6
7+24VD
8+24VD
9DGND1
10 DGND2
11 DIIL

Thermal switch
(standard in ABB re-
sistors)
RMIO:X22 or X2: X22