Safety notes for electrical drives and controllers
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2.4.3
Protection against contact with electrical parts
This section solely applies to devices and drive components with voltages above 50 V. Contact with parts carrying voltage of
more than 50 V may be dangerous and cause electric shock. Certain parts will inevitably carry dangerous voltages during the
operation of electrical devices.
DANGER!
High electrical voltage!
Danger to life, risk of electric shock, and risk of serious personal injury!
The applicable DIN, VDE, EN, and IEC regulations as well as all of the national and local safety and accident prevention
regulations apply to the operation of the device/system. The system manufacturer or operator is responsible for ensuring
compliance with these regulations:
Install the respective covers and guards against accidental contact prior to switching the device/system on.
Rack-mounted devices must be protected against accidental contact by way of a housing, e.g. a switch
cabinet. The national accident prevention regulations must be complied with!
Connect the protective earth conductor (ground conductor) of the electrical system securely to the mains
power supply. Due to the integrated line filters, the leakage current exceeds 3.5 mA!
Comply with the minimum copper cross-section for the protective earth conductor (ground conductor) over its
entire length (see EN 60800-5-1, for example).
Prior to start-up and even for brief measurements or tests, connect the protective earth conductor (ground
conductor) of all of the electrical devices in accordance with the circuit diagram or connect it to the earthing
system on site. Otherwise, the housing may carry high voltages which can cause electric shock.
Do not touch the electrical connections of the components when they are switched on.
Prior to accessing electrical parts carrying voltages above 50 V, disconnect the device from the mains power
supply or voltage source. Secure it so that it cannot be switched on.
The magnitude of the DC bus circuit voltage must be taken into consideration during the installation process
in order to ensure proper insulation and protection. Ensure proper earthing (grounding), conductor rating, and
protection against short circuits.
The device includes a rapid discharge circuit for the DC bus circuit in accordance with EN 60204-1. In certain
device constellations, however, mostly in the case of parallel connection of several servo positioning
controllers in the DC bus circuit or in the case of an unconnected braking resistor, this rapid discharge may be
rendered ineffective. In these cases, the servo positioning controllers may still carry dangerous voltage levels
until up to 5 minutes after they have been switched off (residual capacitor charge).
