Safety notes for electrical drives and controllers
Page 11
Mounting Instructions „Servo drives BL 4000-C“
PRELIMINARY
Version 0.1
For the installation the amount of DC bus voltage must be considered, particularly regarding
insulation and protective measures. Ensure proper grounding, wire dimensioning and
corresponding short-circuit protection.
The device comprises a rapid discharge circuit for the DC bus as per EN 60204-1. In certain
device constellations, however, mostly in the case of parallel connection of several servo drives in
the DC bus or in the case of an unconnected brake resistor, this rapid discharge may be rendered
ineffective. The servo drives can carry voltage until up to 5 minutes after being switched off
(residual capacitor charge).
2.4.4
Protection against electrical shock by means of protective extra-low
voltage (PELV)
All connections and terminals with voltages of up to 50 Volts at the servo drive are protective extra-low
voltage, which are designed safe from contact in correspondence with the following standards:
International: IEC 60364-4-41
European countries within the EU: EN 61800-5-1
DANGER!
High electrical voltages due to wrong connections!
Danger to life, risk of injury due to electrical shock!
Only devices and electrical components and wires with a protective extra low voltage (PELV) may be
connected to connectors and terminals with voltages between 0 to 50 Volts.
Only connect voltages and circuits with protection against dangerous voltages. Such protection may be
achieved by means of isolation transformers, safe optocouplers or battery operation.
2.4.5
Protection against dangerous movements
Dangerous movements can be caused by faulty control of connected motors, for different reasons:
Improper or faulty wiring or cabling
Error in handling of components
Error in sensor or transducer
Defective or non-EMC-compliant components
Software error in superordinated control system
These errors can occur directly after switching on the device or after an indeterminate time of operation.
The monitors in the drive components for the most part rule out malfunctions in the connected drives. In
view of personal protection, particularly the danger of personal injury and/or property damage, this may
not be relied on exclusively.
