© 2016 OJ Electronics A/S
11
INSTRUCTIONS OJ-DV | Installation
Warning
13.5 Potential equalisation
• There is a risk of electrical interference if the ground potential between the OJ-DV and the air handling
unit or duct dier from each other. In the event of potential dierences between system components,
an equalisation conductor must always be fitted.
• Recommended cable cross section: 10 mm
2
.
• Lugs should be used, and the equalisation conductor should be attached to the OJ-DV enclosure via
one of the screws used to mechanically install the unit.
Warning
13.6 GROUNDING HAZARD (PE) LEAKAGE CURRENT HAZARD
Follow national and local regulations regarding protective earthing of equipment with a leakage current
exceeding 3.5 mA.
The OJ-DV technology causes switching at high frequency. This will generate a leakage current in the
earth/grounding connection, PE. (PE=Protective Earth).
This ground leakage current is dependant on the dierent configurations, including RFI filtering, shielded
motor cables and the motor type.
EN/IEC61800-5-1 (Power Drive System Product Standard) requires special emphasis because the
leakage current in the OJ-DV possibly exceeds 3.5 mA. See EN60364-5-54 paragraph 543.7 (Reinforced
protective conductors for protective conductor currents exceeding 10 mA) for further information.
Earth/grounding connection must be made in one of the following 3 ways:
• When connecting only one (1) PE conductor, the minimum cross-section should be at least 10 mm2,
or
• When connecting 2 separate ground conductors, both should comply with the dimensioning rules.
• If 2 conductors are used, they must be connected to individual earth/grounding connectors in the OJ-
DV controller.
• External grounding connection. If the machine housing is approved as a grounding connector, then
the OJ-DV can be grounded to the machine.
• Grounding connectors must always be made in accordance with applicable local and international
standards and directives.
• Follow all local and national electrical regulations for earth/grounding the OJ-DV properly.
• Establish well-executed protective grounding for this OJ-DV that has a leakage current exceeding 3.5
mA.
• A dedicated ground conductor is required for input power, motor power and control wiring.
• Use the clamps and connectors on the OJ-DV for proper ground connections.
• Do not “daisy chain” the ground connection between 2 or more OJ-DV controllers.
• Keep the ground conductor connections as short as possible.
• Always use shielded cables between the OJ-DV and motor, to reduce electrical noise.
• Follow motor manufacturer wiring requirements.
.
Note
13.7 Cable requirements
• All cables and conductors used in connection with the OJ-DV must comply with local and national rules
and regulations.
• The OJ-DV product line fulfils the “residential level” for emissions as per EN-61000-6-3 and “industrial
level” for immunity as per EN-61000-6-2 with up to 5 metre shielded motor cables. (15 kW is limited
to up to 4 metre motor cables). Longer motor cables can be used but it is the installer’s responsibility
to ensure the standards in EN-61000-6-2 are complied with. Industrial level for both immunity and
emissions can be fulfilled, depending on the cable capacity as well as the motor capacity.
• A 6-core, unshielded, 30 AWG/0.066 mm² telecommunications cable can be used as a Modbus cable.
• Generally, cable types with copper conductors are recommended.
• For recommended cable dimensions, see table 13.7.
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