Lenze i700 Manual User Manual download pdf (Page 117)

DC−bus operation

Basic dimensioning

Power distribution of controllers



117

EDS700ACBA EN 4.0

Utilisation factor

Please consider the utilisation factors when determining P

DCtotal

. Reduce the power

requirements if the rated power is not fully used.

Simultaneity factor

Please consider the simultaneity factor when determining P

DCtotal

. Reduce the power

requirements if the drives do not run simultaneously or in opposite direction (braking).

Braking operation

After determining the brake power P

BRtotal

, ensure that the brake power can be provided

by the brake choppers and brake resistors in the DC bus.

Other conditions

The power supply unit must be able to provide the required power (arithmetic mean).

The overload requirements must be within the permissible range:

( 7.4.2)

ƒ 3−min cycle (1 min overload with 150 % and 2 min recovery time with 75 %)

ƒ 15−s cycle (3 s overload with 200 % and 12 s recovery time with 75 %)

For detailed information on the overload capacity, please see the Technical data.

7.5.2 Power distribution of controllers

In a DC−bus operation, the power from the AC mains is stored in the DC bus and consumed

by several controllers. Drive groups with non−synchronous power consumption, partial

load or excess energy from braking operations are suitable for establishing a DC−bus

connection.

L1, L2, L3

U, V, W

DC1

DC2

Power distribution

L1, L2, L3 Mains connection (3/PE AC)

Input mains power

DC1

Total DC−bus power

DC2

DC−bus power available for the DC bus

loss

Power loss

Output power

U, V, W Motor connection

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Lenze i700 Manual User Manual Page 117

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