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Safety instructions for electric drive and control systems
3.3.2
Protective extra-low voltage as protection against electric shock
Bosch Rexroth AG R911298798_Edition 08
●
Connect the equipment grounding conductor of the components of the
electric drive and control system permanently to the main power supply
at all times. The leakage current is greater than 3.5 mA.
●
Establish an equipment grounding connection with a minimum cross
section according to the table below. With an outer conductor cross sec‐
tion smaller than 10 mm
equipment grounding conductors is allowed, each having the same
cross section as the outer conductors.
Cross section outer con‐
ductor
1.5 mm
2
(16 AWG)
2.5 mm
2
(14 AWG)
4 mm
(12 AWG)
2
6 mm
2
(10 AWG)
10 mm
(8 AWG)
2
16 mm
2
(6 AWG)
25 mm
2
(4 AWG)
35 mm
(2 AWG)
2
50 mm
2
(1/0 AWG)
70 mm
2
(2/0 AWG)
...
Tab. 3-1:
Minimum cross section of the equipment grounding connection
Protective extra-low voltage is used to allow connecting devices with basic in‐
sulation to extra-low voltage circuits.
On components of an electric drive and control system provided by Bosch
Rexroth, all connections and terminals with voltages up to 50 volts are PELV
("Protective Extra-Low Voltage") systems. It is allowed to connect devices
equipped with basic insulation (such as programming devices, PCs, note‐
books, display units) to these connections.
Danger to life, risk of injury by electric shock! High electrical voltage by incor‐
rect connection!
If extra-low voltage circuits of devices containing voltages and circuits of
more than 50 volts (e.g., the mains connection) are connected to Bosch
Rexroth products, the connected extra-low voltage circuits must comply with
the requirements for PELV ("Protective Extra-Low Voltage").
MBT High Synchronous Torque Motors
2
(8 AWG), the alternative connection of two
Minimum cross section equipment grounding conductor
Leakage current ≥ 3.5 mA
1 equipment grounding
conductor
10 mm
(8 AWG)
2
16 mm
2
(6 AWG)
25 mm
2
(4 AWG)
35 mm
2
(2 AWG)
...
2 equipment grounding
conductors
2 × 1.5 mm
2
(16 AWG)
2 × 2.5 mm
2
(14 AWG)
2 × 4 mm
(12 AWG)
2
2 × 6 mm
2
(10 AWG)
-
-
-
-
-
-
...
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