16. Braking chopper ACM - D2
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 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-D2 2.2 kW (230 V) 47 Ohm
ACM-D2 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 1, 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 isolates the
inverter from the mains supply if the braking circuit is overloaded.
BERGES electronic
52 Operating manual ACM-D2 29.05.98
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