POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS1000W
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS213400 E01
REV.
J
LANG.
en
PAGE
38/166
3.4.4. Grounding switch
The grounding switch is a safety device that enables safe access to the medium
voltage compartments of the drive.
When the switch is in position grounded, the DC link of the drive is connected to
the PE ground busbar.
The grounding switch is electro-mechanically interlocked with a discharge
monitoring circuit that prevents closing of the switch while the DC link capacitors
are still charged.
Grounding the drive is only possible after the main power supply has been
disconnected, and the DC link has discharged. When the voltage is below 50 V (DC),
the lamp grounding switch unlocked (1 in Fig. 3
7) on the door of the control
compartment lights up, and the grounding switch can be turned to position
grounded (2 in Fig. 3
7).
Figure 3
-
7 Grounding switch
When the grounding switch is in position grounded, the doors of the medium
voltage compartments are released, and the doors can be opened.
3.4.5. Filter
The filter at the drive output reduces the harmonic content of the motor voltage
and generates a nearly sinusoidal motor-friendly voltage waveform. The filter also
eliminates all high dv/dt effects. Therefore, standard motors can be used, and
voltage reflections in the motor cables are eliminated.
Figure 3
-
8 Voltage and current waveforms at drive output
1) Grounding switch unlocked lamp is on
2) Grounding switch in grounded position
Output voltage: 4.16 kV
Output frequency: 60 Hz
1
2
