Wiring; Supply; Powering The Ac Fans In R7 And R8; Brake Resistor Circuit - ABB ACS800 Application Manual

Single drive common dc configurations

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Wiring

Use the same supply connection point. All converters must be fed from the same

transformer. The supply impedance is an important parameter, which influences the

current distribution. All converters must have equal supply impedance.

See

Figure 3 presents an example of a three converter system. Both internal and

external brake choppers are shown.

Only one brake chopper is allowed to be used.

When an internal chopper is used, contactor K1 disconnects both poles of the brake

resistor when a fault is detected. An auxiliary contactor of the contactor K1 is used to

trip the drive on a START INHIBIT fault when the brake resistor overheats.

When an external chopper is used, contactor K3 disconnects both poles of the brake

resistor when a fault is detected. When the brake resistor is disconnected the whole

system will trip on a OVERVOLTAGE fault.

• Wire an output relay of the RMIO board to control the contactor. The default value

is that the contactor is closed during normal operation and when the power is off.

• Set the output relay to open when drive trips on a FAULT or BC SHORT CIRCUIT.

See appropriate drive parameter from parameter group 14.

Warning! Application macro change resets the settings. Restore the settings to

correct values after the macro change.

Wiring

Appendix B Powering the AC fans of R7 and R8

for more information.

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