Resistor braking
146
Protection of frame sizes R6, R7 and R8
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.
Brake circuit commissioning
For Standard Control Program:
• Enable the brake chopper function (parameter 27.01).
• Switch off the overvoltage control of the drive (parameter 20.05).
• Check the resistance value setting (parameter 27.03).
• Frame sizes R6, R7 and R8: Check the setting of parameter 21.09. If stop by
coasting is required, select OFF2 STOP.
For the use of the brake resistor overload protection (parameters 27.02...27.05),
consult an ABB representative.
WARNING!
If the drive is equipped with a brake chopper but the chopper is not
enabled by parameter setting, the brake resistor must be disconnected because the
protection against resistor overheating is then not in use.
For settings of other control programs, see the appropriate
Firmware Manual
.
1
DI1
2
DI2
3
DI3
4
DI4
5
DI5
6
DI6
7
+24VD
8
+24VD
9
DGND1
10
DGND2
11
DIIL
Thermal switch
(standard in ABB
resistors)
RMIO:X22 or X2: X22
Summary of Contents for ACS800-U7
Page 1: ...ACS800 Hardware Manual ACS800 07 Drives 45 to 560 kW ACS800 U7 Drives 50 to 600 hp ...
Page 4: ......
Page 28: ...Operation principle and hardware description 28 ...
Page 51: ...Planning the electrical installation 51 ...
Page 60: ...Planning the electrical installation 60 ...
Page 76: ...Electrical installation 76 ...
Page 84: ...Motor control and I O board RMIO 84 ...
Page 112: ...Maintenance 112 ...
Page 138: ...Dimensional drawings 138 Frame sizes R5 and R6 64778340_1 5 K ...
Page 139: ...Dimensional drawings 139 Frame sizes R7 and R8 68749930_1 7 C ...
Page 140: ...Dimensional drawings 140 IP54 and IP54R units of frame sizes R7 and R8 68749930_6 6 C ...
Page 148: ...3AFE64702165 Rev H EN 2012 09 19 Contact us www abb com drives www abb com drivespartners ...