Nord-drivesystems BU0530 User Manual download pdf (Page 19)

2 Description of function

BU 0530 GB-3712 19

2 Function description

To avoid danger to persons and to prevent damage to material, machines must be able to be switched off

safely. The frequency inverters SK 510E, SK 511E, SK 515E, SK 530E, SK 535E, SK 540 and SK 545E

provide a method for safe switch-off (Safe pulse block).

In order to understand the function of the shut-down methods, it is first of all necessary to consider the function

of the frequency inverter.

The mains voltages are rectified and the resulting DC voltage is reconverted to AC according to the

requirements of the operating status of the motor (frequency and voltage).

Internal structure of the safe pulse block:

Sizes 1 - 4

Sizes 5 - 7

I/O

Emergency stop

µC

Frequency Inverter

Control voltage

VIS 0V (88)

VIS 24V (89)

Safe pulse block

VOS 0V (87)

VOS 24V (86)

Driver

Logic

T1 T3 T5

Gate supply

T2 T4 T6

Gate supply

Driver

Internal power supply

Frequency inverter

Safe pulse block

Mains

Motor

I/O

Control

µC

Logic

VI_S +24V

VI_S 0V

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 55 56

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Nord-drivesystems BU0530 User Manual Page 19