NORD Drivesystems BU0530 - Manual (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
µ C
T 5
T 6
T 3
T 4
T 1
T 2
U
V
W
L 1
L 2
L 3
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
M
Gate supply
Driver
Internal power supply
Frequency inverter
Safe pulse block
Mains
Motor
I/O
Control
µC
T5
T6
T3
T4
T1
T2
U
V
W
M
L1
L2
L3
Logic
VI_S +24V
VI_S 0V