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5.2. Power Supply Connections The VTC-IRE40/2810 can operate on either 24AC or 12VDC, dual voltage power. It is required that the polarity-matched connection is made for 12VDC supply, otherwise IR LEDs, will not operate at night. Primary and secondary grounds are completely isolated to avoid possible ground-loop problems. Clamp connectors of power input AC24V/DC12V (RED WIRE) AC24V/GND (BLACK WIRE) 5.3. Limit of pan and tilt 1. Pan limit Pan is limited to +/- 90°. 2. Tilt limit Tilt is limited to 0° (2°) min ~ 90° max. Installation on Wall Installation on Ceiling 6