© 2016 OJ Electronics A/S
10
INSTRUCTIONS OJ-DV | Installation
13. Electrical installation
Warning
• OJ-DV must only be installed and commissioned by trained/qualified personnel.
• Check that the data specified on the rating plate of the motor matches the data specified on the
OJ-DV rating plate.
• Incorrect electrical installation may cause a risk of severe or fatal personal injury.
Warning
13.1 Dangerous induced voltage (Windmilling)
• If natural drafts through the duct system cause the fan to rotate even when it has not received an
operating signal (called windmilling), there is a risk that the motor will induce voltage on the OJ-DV
motor terminals, making them dangerous to touch.
Caution
13.2 EMC-compliant installation
• Always use shielded cables as motor cables.
• Shielded cable is not necessary for I/O signal cables and Modbus cables.
• Cable shields must always be electrically connected to the earthed product enclosure.
• Use the internal, factory-fitted cable clamps to ensure proper shield connection.
• Never convey mains voltage, motor connections and control signals in the same cable.
• The +24 VDC from the OJ-DV is not intended to be used as power supply for third party products.
If the +24 is used for power supply to third party products, the product might not fulfill the EMC
regulations.
Note
13.3 Short-circuit protection – Power supply
• Short-circuit protection for the supply side of OJ-DV is not provided together with the product.
• Correct short-circuit protection at the power supply input side on the OJ-DV must always be used
in accordance with local and international regulations.
• Short-circuit protection equipment must as a minimum have a tripping curve “C” conforming to
IEC 60898-1.
• Short-circuit protection is supplied by the installer.
Warning
13.4 PERSONAL PROTECTION - USE OF RCDs (TT-system), DIRECT CURRENT (AC/DC) RISK
This product can cause a DC current in the ground protective conductor in the event of a ground
fault.
If the 3 phases to the OJ-DV are not switched in at exactly the same time, then there will be a
generated current in the earthing/ground conductor during the switching time until all 3 phases are
connected.
Take notice of the following precautions:
• If a residual current device (RCD) is used for extra personal protection, use only an RCD of Type
B on the supply side of this product (B type, for alternating and/or pulsating current with DC
components and continuous fault current).
• RCDs of type B must comply with all provisions of IEC 61008/9
• Protective earthing of the OJ-DV in combination with the use of RCDs must always be performed
in accordance with the relevant local and international requirements, laws and regulations
• Failure to follow these precautions can lead to severe or fatal injuries to persons and animals.
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