Bosch Rexroth IndraDrive C - Protective Extra-Low Voltage as Protection against Electric Shock

● Under specific conditions, electric drive
systems can be operated at
mains protected by residual-current-operated circuit-breakers sensitive
to universal current (RCDs/RCMs).
● Secure built-in devices from penetrating foreign objects and water, as
well as from direct contact, by providing an external housing, for
example a control cabinet.
High housing voltage and high leakage current! Danger to life, risk of injury
by electric shock!
● Before switching on and before commissioning, ground or connect the
components of the electric drive and control system to the equipment
grounding conductor at the grounding points.
● 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
section 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
conductor
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)
-
... ... ...
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
insulation 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
("Protective Extra-Low Voltage") systems. It is allowed to connect devices
DOK-INDRV*-SI3-**VRS**-AP06-EN-P
Rexroth IndraDrive Integrated Safety Technology "Safe Torque Off" (as of MPx-16)
Bosch Rexroth AG 17/149
Safety instructions for electric drives and controls
LSA Control S.L. www.lsa-control.com comercial@lsa-control.com (+34) 960 62 43 01