Hitachi J300 Series Quick Reference Manual page 5

HITACHI INVERTER
J300 SERIES
QUICK REFERENCE GUIDE (Part 2/2)
Three phase input 400V
CE-EMC Installation
This instruction describes the electromagnetically compatible setup of
your drive system.
1. As an enduser you must ensure that the HF impedance between
frequency inverter, filter and ground is as small as possible.
See to it that the connections are metallic and have the largest
possible areas (zink-plated mounting plates)
2. Conductor loops act like antennas, especially when they encompass
large areas. Consequently:
Avoid unnecessary conductor loops
Avoid parallel arrangement of „clean" and interference-prone
conductors
3. Lay the motor cable and all analog and digital contol lines shielded.
You should allow the effective shield area of these lines to remain as
large as possible; i.e., do not move the shield further away than
absolutely necessary.
With compact systems, if for example the frequency inverter is
communicating with the steering unit, in the same control cabinet
connected at the same PE-potential, the screen of control lines should
be put on, on both sides with PE. With branch systems, if for example
the communicating steering unit is not in the same control cabinet and
there is a distance between the systems, we recommend to put on the
screen of control lines only on the side of the frequency inverter. If it is
possible, direct in the cable entry section of the steering unit. The
screen of Motor cabels always must be put on, on both sides with PE.
The large area contact between shield and PE-potential you can
realise with a metal PG screw connection or a metallic mounting clip.
Use only copper mesh cable (CY) with 85% coverage
The shielding should not be interrupted at any point in the cable. If
the use of reactors, contactors, terminals or safety switches in the motor
output is necessary, the unshielded section should be kept as small as
possible.
Some motors have a rubber gasket between terminal box and motor
housing. Very often, the terminal boxes, and particularly the threads for
the metal PG screw connections, are painted. Make sure there is always
a good metallic connection between the shielding of the motor cable,
the metal PG screw connection, the terminal box and the motor
housing, and carefully remove this paint if necessary.
4. Very frequently, interference is coupled in through installation
cables. This influence you can minimize:
Lay interfering cables separately, a minimum of 0.25 m from cables
susceptible to interference.A particularly critical point is laying cables
parallel over larger distances. If two cables intersect, the interference is
9
smallest if they intersect at an angle of 90°. Cables susceptible to
interference should therefore only intersect motor cables, intermediate
circuit cables, or the wiring of a rheostat at right angles and never be
laid parallel to them over larger distances.
5. The distance between an interference source and an interference
sink (interference-threatened device) essentially determines the
effects of the emitted interference on the interference sink.
You should use only interference-free devices and maintain a
minimum distance of 0.25 m from the drive.
6. Safety measures
Ensure that the protective conductor terminal (PE) of the filter is
properly connected with the protective conductor terminal of the
frequency inverter. An HF ground connection via metal contact
between the housings of the filter and the frequency inverter, or solely
via cable shield, is not permitted as protective conductor connection.
The filter must be solidly and permanently connected with the ground
potential so as to preclude the danger of electric shock upon touching
the filter if a fault occurs. You can achieve this by:
- connecting it with a grounding conductor of at least 10 mm
- connecting a second grounding conductor, connected with a
separate grounding terminal, parallel to the protective conductor
(The cross section of each single protective conductor terminal
must be designed for the required nominal load)
6 K LHO GHG FRQ WU RO
F DEOH V
Figure: Hitachi frequency inverter with footprint filter
10
External dimensions and terminal positions part 1/2
Digital operator
Cable entry
Cable entry
2
;
Handle
Digital operator
Main
terminals
6 K LHO GHG P RW RU
F DEOH V
Digital operator
(part 2/2 on next page)
Air
Air
Cable entry
J300- J300-
055 HFE4 110 HFE4
075 HFE4 150 HFE4
Air Air
Digital operator
Control
terminals
Control
Main terminals
terminals
J300-
J300-
300 HFE4
220 HFE4
370 HFE4
Air
Control
terminals
Main terminals
Air
J300-
450 HFE4
550 HFE4
11
Air
Air
Handle
Air