Radio-Frequency Grounding For Converter Operation - Siemens SIMOTICS XP 1MB5 Operating Instructions Manual

Electrical connection
6.10 Connecting the converter
Table 6-6 Maximum voltage peaks at the motor terminals for motors specifically designed for converter operation
Rated motor voltage
V
≤ 500 V
> 500 V to 690 V
Depending on the step height, the voltage rise times for the individual voltage steps in the
line-to-ground voltage at the motor end of the cable must not fall below the following values.
Table 6-7 Rise times as a function of voltage level
Step height
6.10.1

Radio-frequency grounding for converter operation

In converter operation, the converter emits RF alternating currents. To establish and RF-specific
optimal connection between motor terminal box and motor enclosure, you can use flexible
braided copper flat cables with low impedance and a broad frequency range.
Establish the radio-frequency ground connection with flat cables. Alternatively you can
establish the radio-frequency ground connection with cable lugs.
①
②
③
④
Figure 6-7
You find further information in the "Operation with converter (Page 43)" section.
92
Û
phase-to-phase
V
pk
1600
2200
V
900
1050
1260
Hexagon bolt
Spring washer
Terminal Board
Grounding conductor
High-frequency grounding
Maximum peak voltage at the motor terminals
Û
phase-to-ground
V
pk
1400
1500
⑤
Hexagon nut
⑥
Radio-frequency grounding cable
⑦
Cable lug
Operating Instructions, 04/2023, A5E52802354A
DC link U
1080
Minimum rise time t
r
ns
100
200
400
1MB5 shaft height 400/450
DC
V
750