Instruction Manual

Functional safety with NORD SK 200E frequency inverters
30 BU 0230 GB-2712
Size 4:
Input
circuitry
I/O
Control
DriverµC
T5
T6
T3
T4
T1
T2
U
V
W
M
L1
L2
L3
Logic
=
=
=
=
GND
24V
=
=
Control voltage
Internal voltage (Primary power)
3x High 1x Low
GND_SH
24V_SH
Frequency Inverter
Emergency
Option "safe pulse block"
stop
The semiconductor switches of the inverter (T1 to T6) are controlled by a highly complex pulse pattern. This
pulse pattern is generated by the microcontroller (µC) and amplified by the driver. The drivers convert the logic
signals on the control voltages of the semiconductor switch. The semiconductor switches are switched via the
control voltage and the pulse pattern is amplified and applied to the motor terminals. Due to the low-pass effect
of the motor, a three-phase pulse width modulated sine wave voltage - a three-phase system, results from the
pulsed voltage. The motor generates a torque.