AOTORO EK51-D50M4 (01) PDF Document

The model number can be broken down as follows:

EK: Photoelectric switch, Relay contact output type

51: Serial number for the side length of the housing

D: Detecting method is Diffuse reflective

50: Detecting distance is 50cm

M: Control output is Free power relay output

4: Features a Light ON/Dark ON selectable switch

The operation of the two modes is as follows:

Light ON Mode:

When the receiver detects received light, the Operation Indicator (LED) turns ON, and the TR output turns ON.

When the light is interrupted, the Operation Indicator (LED) turns OFF, and the TR output turns OFF.

Dark ON Mode:

When the receiver detects received light, the Operation Indicator (LED) turns OFF, and the TR output turns OFF.

When the light is interrupted, the Operation Indicator (LED) turns ON, and the TR output turns ON.

The wiring connections for the AOTORO EK51-D50M4 are as follows:

Power Circuit (24-240VAC/24-240VDC):

Blue Wire: Power

Brown Wire: Power

Relay Contact Output (1c):

Gray Wire: N.C. (Normally Closed)

Black Wire: N.O. (Normally Open)

White Wire: COMO (Common)

Follow these steps for installation and sensitivity adjustment:

1. The sensitivity of the sensor must be adjusted in accordance with the existence of any reflective material in the background, even when the sensor is set to its maximum sensitive position.

2. Set the target at the area of detecting. Then, turn the sensitivity adjuster down from the maximum position to the point where the indicator just turns on. Note this position.

3. Take the target out of the sensing area. Then, turn the adjuster up from the minimum position until the point where the indicator turns on. If the indicator does not turn on, the maximum position is the second point. Note this position.

4. Set the adjuster to the center point between the two switching points noted in steps 2 and 3. This is the optimal position.

Important Considerations:

If the reflectance of the target is higher than non-glossy white paper, it might cause a malfunction due to reflection from the target when it is near the sensor. To prevent this, ensure there is enough space between the target and the sensor, or install the target surface at a 30 to 45-degree angle relative to the optical axis.

If you are using more than two photoelectric sensors in parallel, the space between them should be more than 30cm.

Please follow these safety precautions:

1. Do not use the sensor in an environment with explosive or flammable gas.

2. Never disassemble, repair, or tamper with the product.

3. Keep the supply voltage within the specified range.

4. Use a load that is under the specified rated area.

Avoid using the product under the following conditions:

(1) In a place with direct sunlight.

(2) In a place where humidity is high and condensation may occur.

(3) In a place where corrosive gas exists.

(4) In a place where vibration or shock is directly transmitted to the product.

(1) Before applying power, ensure the supply voltage is less than the maximum rated supply voltage.

(2) If the sensor cable must be laid in a tube or duct with a high-tension or power line, it can cause induction, possibly resulting in malfunction or damage. In principle, the cable should be laid separately or shielded.

(3) For extending wires, use a wire with a cross section greater than 0.3mm² and keep the length less than 100m.

(4) Do not pull on the wire with strong force.

(5) Do not apply excessive force (e.g., hitting with a hammer) to the sensor during installation, as this may damage its water-resistance.

Switching Regulator: When using a commercially available switching regulator, be sure to ground the FG (Frame Ground) terminals.

Power Supply Reset Time: The photoelectric switch will begin sensing no later than 100ms after the power is turned on. If the load and the photoelectric switch are connected to different power supplies, the photoelectric switch must always be turned on first.

Turning Off Power: When turning off the power, an output pulse may be generated. It is recommended to turn off the power supply of the load or the load line first.