Instruction DVG EC controller

© 2019 OJ Electronics A/S
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INSTRUCTIONS OJ-DV | Maintenance and troubleshooting
= No connection between ”GND” and Add.Pin1/ Add.Pin2
= Connection between ”GND” and Add.Pin1/ Add.Pin2
• Via OJ-DV PCTool, where OJ-DV can be set to other Modbus addresses – see instructions for
OJ-DV PCTool.
Modbus protocol
• Contact OJ Electronics A/S if you require a complete Modbus protocol.
22. Maintenance
22.1. OJ-DV is maintenance free under normal operating conditions and load profiles.
22.2. The cooling fins must be kept free of dust, dirt and other foreign matter so that air can pass freely
over them. Deposits of dust, dirt or other foreign matter on and between the cooling fins will prevent
cooling of the OJ-DV and thus impair performance.
22.3. The cooling fins may become very hot. (Max. 95°C under normal operating conditions.)
22.4. OJ-DV cannot be repaired on site. Never attempt to repair a defective unit. Contact your supplier to
obtain a replacement.
22.5. Additional technical data are available on request from OJ Electronics A/S.
23. Troubleshooting
23.1. Before opening OJ-DV, the mains voltage must be disconnected for at least 3 minutes to ensure
there is no risk of dangerous residual currents in electronic circuits or capacitors.
23.2. If natural drafts through the duct system cause the fan to rotate even though it has received no
operating signal, there is a risk that the motor will induce voltage on the OJ-DV motor terminals,
making them dangerous to touch.
23.3. Troubleshooting when OJ-DV is controlled via A/D signals:
Caution
Warning
Warning