Fusing With Direct Mains Supply; Grounding The Power Supply System - Bosch Rexroth IndraDrive HMV01.1E-W0030 Project Planning Manual

Rexroth IndraDrive

Fusing with Direct Mains Supply

13.4 Grounding the Power Supply System

Grounded three-phase mains
Ungrounded three-phase mains
DOK-INDRV*-HMV-*******-PR01-EN-P
Fusing the mains supply can implement, with power circuit breakers or
slow-blow fuses of the gL/gG type:
HMV01.1E- Fusing
[A]
W0030 63
W0075 160
W0120 250
HMV01.1R- Fusing
[A]
W0018 35
W0045 80
W0065 125
Fig. 13-13: Fusing with direct mains supply
HMV01.1E and HMV01.1R can be operated from three-phase systems
with grounded neutral points or phases without control-to-load isolation.
With ungrounded mains (IT mains) there is the increased danger that
unacceptably high overvoltages could occur between the phase and the
housing. Both the HMV01.1E and HMV01.1R can be protected against
unacceptable overvoltages,
• if they are connected via an isolating transformer (the star point of
the output side and the PE connection of the power supply unit are
connected over one grounding rail)
- or -
• if the unit is protected by over voltage suppressers.
Note: Connecting the HMV01.1E and HMV01.1R via an isolating
transformer offers the best protection against overvoltage and
the greatest operating safety.
Appendix
Power Circuit Breaker
Setting [A]
50
125
200
Power Circuit Breaker
Setting [A]
30
70
100
13-13
Wire cross
section
[mm²]
16
50
120
Wire cross
section
[mm²]
6
25
50