USVD-4X

Unwanted Detection: Adding a filtering delay that makes the USVD-4X wait before activating the relay could help avoid unwanted activations caused by random objects passing by or strong winds. Turn on dip switch 3 for a 1 second delay, dip switch 4 for a 2 second delay, or both for a 4 second delay. Note, depending on orientation of USVD-4X the dip switches may be both upside down and backwards.

Sensor Placement: The sensor may be sensing the curb or the ground in front of the device. Make sure the sensor is not angled downward, and if necessary angle the sensor slightly towards the sky.

High Sensitivity: The small, brass sensitivity adjustment knob is located on a blue potentiometer. Try decreasing sensitivity on the USVD-4X by rotating the sensitivity dial counter-clockwise a few full rotations. The dial is set to maximum from the factory, and the full range of adjustment is 25 full turns. Attach a multimeter to the GND and SEN pins, found to the right of the sensitivity adjustment knob, to read the sensitivity voltage. The minimum is 0.5V and the maximum is 5V.

Frozen Sensors: Ice covering the circular sensor faces will cause constant detection.

Incorrect Wiring: Make sure to wire to normally open (NO) and not normally closed (NC) on the USVD-4X. The normally closed inputs will always be closed unless there is a detection, meaning there will be a constant signal coming from this device.

Sensor Placement: The sensor may be sensing the curb or the ground. Make sure the sensor is not angled downward, and if necessary angle the sensor slightly towards the sky or mount the sensor higher above the ground. Typical installation height is about 2 feet above the ground.

High Sensitivity: The small, brass sensitivity adjustment knob is located on a blue potentiometer. Try decreasing sensitivity on the USVD-4X by rotating the sensitivity dial counter-clockwise a few full rotations. The dial is set to maximum from the factory, and the full range of adjustment is 25 full turns. Attach a multimeter to the GND and SEN pins, found to the right of the sensitivity adjustment knob, to read the sensitivity voltage. The minimum is 0.5V and the maximum is 5V.

USVD-4X Relay Test

1. While the USVD-4X has power, disconnect any wires going into the relay outputs 1NC, 1COM, and 1NO on your USVD-4X.
   Note: Relay 2 outputs 2NC, 2COM, and 2NO may be tested as well but they may be configured for pulse on entry, pulse on exit, or both. In which case the relay will only activate for a moment at the designated time instead of holding activation.
2. Set digital multimeter to check for continuity. On the USVD-4X connect one meter lead to 1NO. Connect the other meter lead to 1COM.
3. The meter should read open (OL, INF) and should not beep yet. Put a solid object in front of the USVD-4X sensors to activate the relay. Verify the USVD-4X green light on its circuit board turns on, and the meter reads less than 10 ohms and now beeps. If the meter is still showing open and does not beep, then the sensitivity is too low or the relay is defective.

Power Requirements: Make sure one of the USVD-4X PWR inputs is connected to 12-24VAC/DC power and the other PWR input is connected to ground on your power source.

Low Sensitivity: The small, brass sensitivity adjustment knob is located on a blue potentiometer. Try increasing sensitivity on the USVD-4X by rotating the sensitivity dial clockwise a few full rotations. The dial is set to maximum from the factory, and the full range of adjustment is 25 full turns. Attach a multimeter to the GND and SEN pins, found to the right of the sensitivity adjustment knob, to read the sensitivity voltage. The minimum is 0.5V and the maximum is 5V.

USVD-4X Relay Test

1. While the USVD-4X has power, disconnect any wires going into the relay outputs 1NC, 1COM, and 1NO on your USVD-4X.
   Note: Relay 2 outputs 2NC, 2COM, and 2NO may be tested as well but they may be configured for pulse on entry, pulse on exit, or both. In which case the relay will only activate for a moment at the designated time instead of holding activation.
2. Set digital multimeter to check for continuity. On the USVD-4X connect one meter lead to 1NO. Connect the other meter lead to 1COM.
3. The meter should read open (OL, INF) and should not beep yet. Put a solid object in front of the USVD-4X sensors to activate the relay. Verify the USVD-4X green light on its circuit board turns on, and the meter reads less than 10 ohms and now beeps. If the meter is still showing open and does not beep, then the sensitivity is too low or the relay is defective.

The two PWR inputs on the USVD-4X connect to the VOUT+ and VOUT- on the Chime 100. Either 1NO and 1COM or 2NO and 2COM on the USVD-4X connect to Input 1 and Input 2 on the Chime 100. The relay 1 outputs on the USVD-4X are presence relays and will emit a constant signal when a detection occurs. The relay 2 outputs can be set to pulse with dip switches 1 and 2, which will only emit a momentary pulse signal when a detection occurs.

Near the sensitivity adjustment dial, there are two pins sticking up from the board labeled SEN and GND. To check the sensitivity, use a voltage meter to measure the voltage across these two pins. A 0.5V reading indicates minimum sensitivity, and a 5V reading indicates maximum sensitivity.

When a vehicle drives in front of the device the four sensors on the front should be facing directly at the side of the vehicle. The one sensor in the middle by itself should be pointing in the direction the vehicle came from. It detects where this vehicles ends and the next one begins.