Protective Extra-Low Voltage As Protection Against Electric Shock; Protection Against Dangerous Movements - Bosch REXROTH IndraDrive Applications Manual
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- Project planning manual (128 pages) ,
- Troubleshooting manual (437 pages) ,
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DOK-INDRV*-MLD-APPLI**-AW02-EN-P
Rexroth IndraDrive Rexroth IndraMotion MLD Application Examples
3.3.2
Protective Extra-Low Voltage as Protection Against Electric Shock
3.3.3
Protection Against Dangerous Movements
LSA Control S.L. www.lsa-control.com [email protected] (+34) 960 62 43 01
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 copper wire of a
cross section of at least 10 mm
equipment grounding conductor of the same cross section as the original
equipment grounding conductor.
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 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 Rexroth products,
the connected extra-low voltage circuits must comply with the requirements for
PELV ("Protective Extra-Low Voltage").
Dangerous movements can be caused by faulty control of connected motors.
Some common examples are:
●
Improper or wrong wiring or cable connection
●
Operator errors
●
Wrong input of parameters before commissioning
●
Malfunction of sensors and encoders
●
Defective components
●
Software or firmware errors
These errors can occur immediately after equipment is switched on or even
after an unspecified time of trouble-free operation.
The monitoring functions in the components of the electric drive and control
system will normally be sufficient to avoid malfunction in the connected drives.
Regarding personal safety, especially the danger of injury and/or property dam‐
age, this alone cannot be relied upon to ensure complete safety. Until the
integrated monitoring functions become effective, it must be assumed in any
case that faulty drive movements will occur. The extent of faulty drive move‐
ments depends upon the type of control and the state of operation.
Bosch Rexroth AG
Safety Instructions for Electric Drives and Controls
2
(8 AWG) or additionally run a second
11/97
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