Safety instructions
7
Grounding
These instructions are intended for all who are responsible for the grounding of the
drive.
•
The Prevention of unexpected start-up function (option +Q950) does not
remove the voltage from the main and auxiliary circuits.
•
The Safe torque off function (option +Q967) does not remove the voltage from
the main and auxiliary circuits.
•
At installation sites above 2000 m (6562 ft), the terminals of the RMIO board
and option modules attached to the board do not fulfil the Protective Extra Low
Voltage (PELV) requirements stated in EN 50178.
WARNING! Ignoring the following instructions can cause physical injury, death,
increased electromagnetic interference and equipment malfunction:
•
Ground the drive, motor and adjoining equipment to ensure personnel safety in
all circumstances, and to reduce electromagnetic emission and interference.
•
Make sure that grounding conductors are adequately sized as required by
safety regulations.
•
In a multiple-drive installation, connect each drive separately to protective
earth (PE).
•
In European CE compliant installations and in other installations where EMC
emissions must be minimized, make a 360° high frequency grounding of cable
entries in order to suppress electromagnetic disturbances. In addition, connect
the cable shields to protective earth (PE) in order to meet safety regulations.
•
Do not install a drive with EMC filter option +E202 or +E200 on an ungrounded
power system or a high-resistance-grounded (over 30 ohms) power system.
Note:
•
Power cable shields are suitable for equipment grounding conductors only
when adequately sized to meet safety regulations.
•
As the normal leakage current of the drive is higher than 3.5 mA AC or 10 mA
DC (stated by EN 50178, 5.2.11.1), a fixed protective earth connection is
required. In addition, we recommend that you use:
• a cross-section of the protective earthing conductor of at least 10 mm
2
Cu or
16 mm
2
Al,
or
• an automatic disconnection of the supply in case of discontinuity of the
protective earthing conductor,
or
• a second protective earthing conductor of the same cross-sectional area as
the original protective earthing conductor.
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