2 For your own safety
2.7
Protection against contact with electrical
parts
Dangerous electrical voltage!
In certain device constellations, the rapid discharge of the DC bus voltage of the servo
drive may be rendered ineffective. In these cases, the servo drives may still carry
dangerous voltage levels up to 10 minutes after they have been switched off (residual
capacitor charge).
Wait 10 minutes prior to performing any work on the connections. Always measure the
voltage with a suitable instrument.
To prevent accidents, injuries and damage to property:
Follow the national accident prevention regulations (for Germany, this is DGUV regulation
3 (formerly BGV A3)).
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 against reconnection.
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 an enclosure, e.g. a switch cabinet.
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 (see section 13
on page 235) in a fixed manner (hardwiring)
to the supply network or to the earthing system on site.
Comply with the minimum copper cross-section for the protective earth conductor (ground
conductor) over its entire length (see EN 61800-5-1). Otherwise, the housing may carry
high voltages which can cause electric shock.
Due to the integrated line filters, the leakage current exceeds 3.5 mA. This is why two
connection points must be hard-wired
The magnitude of the DC bus 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.
Product manual BL 4000-C
Page 21 of 298
