16.Braking chopper ACM D2/S2
16.1.Braking chopper 0.37 kW - 1.1 kW (1 x 230V)
The inverters ACM D2 0.37 - 1.1 kW are equipped as standard with an internal dynamic braking
chopper.
Braking resistance: 50 Ohm/50 Watt.
16.2.Braking chopper 0.75 kW - 37.0 kW (3 x 400V)
The inverters ACM D2/S2 0.75 - 37.0 kW are equipped as standard with an control unit for dynamic
braking chopper. Brake operation is possible after connection of an external brake resistor.
16.2.1.Minimum values for braking resistors (accessory)
The permitted minimum values for braking resistors depend on the respective inverter type and are
shown in the table below. The power rating of the braking resistors must be selected corresponding
to the required braking power.
Inverter Minimum braking resistance
ACM S2 2.2 kW (230 V) 47 Ohm
ACM S2 0.75 - 4.0 kW (400 V) 75 Ohm
ACM D2 5.5 - 37.0 kW (400 V) 20 Ohm
16.2.2.Assembling the braking resistor
The braking resistor is connected to terminals (+) and (Br) of the terminal strip. The length of the
connecting cables must not exceed 2 m.
The safety notes in this manual (Chapter 2, Page 3) must be followed exactly if work is
performed inside the inverter!
The braking resistor must be equipped with a temperature monitoring device which insulates the
inverter from the mains supply if the braking circuit is overloaded.
BERGES electronic
09.07.2001 Operating manual ACM D2/S2 51
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