Lenze EDB9300UES - Manual (Page 85)

Transport, Installation and Connection
80 BA8230
•
A central connection is to be made between ground and the operating earth /
protective conductor system to IEC 364-5.
DIN VDE 0100 also applies.
•
Uniform reference potential should preferably be provided and all electrical
equipment is to be earthed. It must be ensured that no external equipment can be
damaged by the earthing of the control electronics in the 8230 frequency inverter.
•
Parts of the system and cubicles containing other 8230 frequency inverter units,
control cubicles, construction and machine parts etc. are always to be connected in
a star configuration to the earth/protective conductor system to prevent loops.
If the system mainly involves drive cubicles, a method of earthing which is more
efficient as far as EMC is concerned should be used on installation, i.e. earthing via
a grid system.
•
Induced interference is to be dispersed over large metal surfaces. All equipment
such as RFI filters (including standard profile parts as well as PE and screen rails)
are to be fixed to metal component parts to ensure low impedance. The PE /
screen rail is the central earthing point in the 8230 frequency inverter cubicle and in
cubicles of 600 mm width and above is to be secured to the cubicle frame or the
mounting plate through at least three electrical contact points. A metal rear panel
onto which all units are mounted is particularly recommended in a switchgear
cubicle.
If mounting plates are used whose surfaces are not good conductors, for example
painted, anodised or yellow chromated, the surface coating must be removed at
equipment contact points.
Galvanised component parts for the cubicle and metal parts at contact points are
ideal from the viewpoint of EMC. To achieve good EMC these components must be
screened together directly to provide good contact.
Cubicles in which the complete edge of side and rear panels is in contact with the
cubicle frame are recommended. The door is to be included using a connection
method which is effective at HF.
•
Screw connections on metal parts which are painted and anodised are to be fitted
with special contact washers or the insulating coatings are to be removed. Low
impedance contact surfaces must be cleaned thoroughly to remove paint before
assembly. Protect all connection points against corrosion, using contact protection
grease for example.
•
According to the concept of EMC protection zones all signal leads are to be fed into
the cubicle at just one level, if possible, not at several different levels.
•
All switchgear cubicles involved in linked drives are to be connected with a potential
compensation cable of at least 25 mm² if they do not include a screen rail or this rail
is not continuous.
•
No unswitched contactors, relays, solenoid valves, electromechanical meters,
counters etc. may be used in a switchgear cubicle with the 8230 frequency inverter.
All inductances installed on the same current circuit are to be connected with surge
supressors. DC-activated coils are to be connected with a diode or
Z diode and AC-operated coils are damped using a varistor or an RC component.
If contactors without with surge supressors are used in an adjacent cubicle, the
cubicles are to be separated by a metal partition.
•
Cables to the 8230 frequency inverter control electronics must be screened.
Show/Hide Bookmarks