Protective Extra-Low Voltage As Protection Against Electric Shock; Protection Against Dangerous Movements - Bosch Rexroth IndraMotion MTX micro Commissioning Manual

16/141 Bosch Rexroth AG
Safety Instructions for Electric Drives and Controls
3.3.2

Protective Extra-Low Voltage as Protection Against Electric Shock

3.3.3

Protection Against Dangerous Movements

Rexroth IndraMotion MTX micro Easy setup for Standard Turning and Milling Machines
● 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 sec‐
tion according to the table below. With an outer conductor cross section
smaller than 10 mm
ment grounding conductors is allowed, each having the same cross
section as the outer conductors.
Cross section outer con‐
ductor
1.5 mm (16 AWG)
2
2.5 mm 2 (14 AWG)
4 mm 2 (12 AWG)
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)
...
Fig.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 between 5 and 50 volts
are PELV ("Protective 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 incorrect
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 re‐
quirements for PELV ("Protective Extra-Low Voltage").
Dangerous movements can be caused by faulty control of connected motors.
Some common examples are:
DOK-MTXMIC-EASY*******-CO04-EN-P
(8 AWG), the alternative connection of two equip‐
2
Minimum cross section equipment grounding conductor
Leakage current ≥ 3.5 mA
1 equipment grounding
conductor
10 mm 2 (8 AWG)
16 mm 2 (6 AWG)
25 mm 2 (4 AWG)
35 mm 2 (2 AWG)
...
2 equipment grounding
conductors
2 × 1.5 mm (16 AWG)
2
2 × 2.5 mm 2 (14 AWG)
2 × 4 mm 2 (12 AWG)
2 × 6 mm 2 (10 AWG)
-
-
-
-
-
-
...