●
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
2
(8 AWG), the alternative connection of two
equipment grounding conductors is allowed, each having the same
cross section as the outer conductors.
Cross section outer con‐
ductor
Minimum cross section equipment grounding conductor
Leakage current ≥ 3.5 mA
1 equipment grounding
conductor
2 equipment grounding
conductors
1.5 mm
2
(16 AWG)
10 mm
2
(8 AWG)
2 × 1.5 mm
2
(16 AWG)
2.5 mm
2
(14 AWG)
2 × 2.5 mm
2
(14 AWG)
4 mm
2
(12 AWG)
2 × 4 mm
2
(12 AWG)
6 mm
2
(10 AWG)
2 × 6 mm
2
(10 AWG)
10 mm
2
(8 AWG)
-
16 mm
2
(6 AWG)
16 mm
2
(6 AWG)
-
25 mm
2
(4 AWG)
-
35 mm
2
(2 AWG)
-
50 mm
2
(1/0 AWG)
25 mm
2
(4 AWG)
-
70 mm
2
(2/0 AWG)
35 mm
2
(2 AWG)
-
X mm
2
(X × 0.5) mm
2
(applies to X ≥ 50)
-
Tab. 3-1:
Minimum cross section of the equipment grounding connection
3.3.2
Protective extra-low voltage as protection against electric shock
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 Rexroth,
all connections and terminals with voltages up to 50 volts are PELV ("Protec‐
tive Extra-Low Voltage") systems. It is allowed to connect devices equipped
with basic insulation (such as programming devices, PCs, notebooks, 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 Rexroth
products, the connected extra-low voltage circuits must comply with the re‐
quirements for PELV ("Protective Extra-Low Voltage").
Bosch Rexroth AG
DOK-INDRV*-HXX05******-PR02-EN-P
38/407
Rexroth IndraDrive ML Drive Systems with HMU05
Safety instructions for electric drives and controls
