Slim Body Automatic Sensitivity Setting Photoelectric Sensor SU-7/SH (Discontinued Products)

Sensor head

Ultra-slim type

• With tapped screws

The tightening torque should be 0.14 N·m or less. ・ With attached screws and nuts

The tightening torque should be 0.14N·m or less. For ultra-small type, mark sensor & glass substrate detection sensor ・ The tightening torque should be 0.29 N·m or less when mounting the sensor head with the screws.

Chemical resistant type ・  Use M3 screws to mount the sensor head with the attached sensor head mounting bracket.

・  Use M4 screws to assemble the sensor head with the optional sensor head mounting bracket MS-SH6-2, in order to form the convergent sensing mode.

• Do not use where it can be exposed to molten alkali metals (sodium, potassium, lithium, etc.), fluorine gas (F₂), CIF₃, OF₂ (including gaseous state), etc.
• In case of cable extension, the extended portion should be placed in an area where it is not exposed to chemicals.

Amplifier

• The self-diagnosis output does not incorporate a shortcircuit protection circuit. Do not connect it directly to a power supply or a capacitive load.

・Normal sensitivity setting

Standard setting
The sensor recognizes the ON (object present) and OFF (object absent) levels by your pressing of the buttons. The threshold level is automatically set at the middle between ON and OFF levels.

・Maximum sensitivity setting

Full power setting
The maximum sensitivity is set. Take care that, in case of the diffuse reflective type, if a background object is present, the sensing output may turn ON even without the sensing object.

*How to set sensitivity with external inputs

Remote sensitivity setting (SU-77 only)

Instead of pressing buttons, the sensitivity can be set with the remote sensitivity setting inputs. (There is no external sensitivity shift mode.) Setting procedure The procedure is the same as for setting with sensitivity buttons, except that instead of pressing the buttons, the remote sensitivity setting input wire is shortcircuited to 0 V. The mode selection switch is set to either the “SET” or “RUN” side. ・Time chart The self-diagnosis output stays ON for 40 ms approx. after ON input or OFF input is recognized by the sensor. (If the difference between the ON and OFF levels (the difference between incident light levels) is so small that stable detection is not possible, it does not turn ON.) T1≥1,000ms、3,000ms>T2≥5ms、T3≈310ms、T4≈40ms、T5≥500ms Notes: 1)Signal condition ... Low: 0 to 1 V, High: 4.5 to 30 V, or open Input impedance: 10 kΩ 2):Do not move the object, etc., or change the incident light intensity during T3.

・Sensitivity for detecting minute differences

Limit sensitivity setting

Setting for minute detection is possible just by pressing a button once without the object being present. For detecting a tiny object                 For stable detection of an object without detecting the background 　　　　　　　　　　　　　　　 Setting procedure By pressing either ON or OFF button for 3 sec. or more, the threshold level is set 15 % either lower or higher than the object absent level as shown in the right figure. (Please note that the output operation cannot be reversed.) For example, press the ON button for detecting a tiny object.

・For applications in which beam intensity fluctuates

Sensitivity shift

If the incident light is stable in either the object present or object absent state, by shifting the threshold level towards this state, stable sensing is possible even if the incident light is unstable in the other state. The setting level is the same as for limit sensitivity setting. However, since the operating level is shifted after the normal sensitivity setting, output operation is selectable. Setting procedure Press the sensitivity setting button which was pressed in the stable light received condition. For example, for a diffuse reflective type sensor, in case a background object is present, press the button which was pressed with only the background object being sensed.

• SU-79 can store four channels of sensitivity levels, which can be selected as per your requirement. Designate the channel that is to store the sensitivity by making the remote sensitivity selection inputs 1 and 2 suitably High or Low.

Wiring

Signal condition                 Channel selection

• The external synchronization function can be used to control the timing of sensing. Edge trigger or gate trigger are available.

T≥0.6ms（T≧0.8ms when the interference prevention function is used）

• When the test input (emission halt input) (violet) is shortcircuited to 0 V (Low), the beam emission is halted. This function is useful for a start-up test since the sensing output can be made ON / OFF without the sensing object. Short-circuit to 0 V and open the input, repeatedly. If the sensing output follows this operation, the sensor is working well, else not.

• Every SU-7 series amplifier (excluding SU-75) is incorporated with a variable ON / OFF delay timer for 0 to 5 sec.

ON-delay As only longer signals are extracted, this function is useful for detecting if a line is clogged, or for sensing only objects taking a long time to travel. OFF-delay Since the output signal is extended for a fixed time interval, this function is useful if the output signal is so short that the connected device cannot respond.

• Timer period setting

Adjust the time duration of ON or OFF delay by turning the timer adjuster. Note: Adjust the timer under “SET” mode. Adjustment is not allowed in “SIF” or “RUN” mode.

• The sensor checks the incident light intensity, and if it is reduced due to dirt or dust, or beam misalignment, an output is generated.

• Do not use during the initial transient time (0.5 sec.) after the power supply is switched on.

• Following work must be done in cace of using this product as a CE marking (European standard EMC Directive) conforming product.

Place ferrite core at the sensor cable.

When sensor head is thru-beam type

When sensor head is reflective type

Place a ferrite core near the amplifier.
In that condition, the sensor head cable should be single-winding.
Prepare 1 pc. of the following recommended ferrite core (or an equivalent product.)
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