Operating instructions

Operation with only one supply frequency inverter

MICROMASTER 420 / 440 – DC link coupling between several

Frequency inverters

Note:

When fusing/protecting the frequency inverters and DC link couplings, it is

also important that the plant/system and country-specific regulations are

carefully observed.

Example 1:

A&D SD Page 14/32

Line fuses

3 x 200A

Line

contactor

Line reactor

Inverter

3 ~

Motor

3 ~

Motor Motor

2 x 40A

MM440

75kW

(CT)

MM440

11kW

(CT)

MM420

7,5kW

3-ph. 380-480V AC 50/60Hz

2 x 80A

PE PE PE

PEPEPE

2 x 32A

Short-circuit

proof

implementation

and routing

Cable cross-section

2 x 25mm²

Fig. 2-2: DC link coupling of a 75kW MM440 frequency inverter with an

11kW MM440 and a 7.5kW MM420