SMC ZL Series Digital Pressure Switch for Energy-Saving Control Ejector

Before Use

Thank you for purchasing the SMC ZL Series with Digital Pressure Switch. Please read the operation manual carefully before operating the product and make sure you understand its capabilities and limitations. Please keep the operation manual handy for future reference.

To obtain the operation manual about this product, please refer to the SMC website (http://www.smcworld.com) or contact SMC directly.

Safety Instructions

These safety instructions are intended to prevent hazardous situations and/or equipment damage. They indicate the level of potential hazard with the labels of "Caution", "Warning" or "Danger". They are all important notes for safety and must be followed in addition to International standards (ISO/IEC) and other safety regulations.

To obtain operating the ejector which is mounted on this product, please refer to "Handling Precautions for SMC Products" for vacuum equipment on our general product catalogue or precaution for each product.

Caution:

Operator error could result in injury or equipment damage.

Warning:

Operator error could result in serious injury or loss of life.

Danger:

In extreme conditions, there is a possibility of serious injury or loss of life.

Operator

This operation manual is intended for those who have knowledge of machinery using pneumatic equipment, and have sufficient knowledge of assembly, operation and maintenance of such equipment. Only those persons are allowed to perform assembly, operation and maintenance. Read and understand this operation manual carefully before assembling, operating or providing maintenance to the product.

Warning Instructions

• Do not disassemble, modify (including changing the printed circuit board) or repair. An injury or failure can result.
• Do not use the product except for energy-saving control ejector. Fire, malfunction, or damage to the product or the system can result.
• Do not operate the product outside of the specifications. Do not use for flammable or harmful fluids. Fire, malfunction, or damage to the product can result. Verify the specifications before use.
• Do not operate in an atmosphere containing flammable or explosive gases. Fire or an explosion can result. This product is not designed to be explosion proof.
• Do not use the product in a place where static electricity is a problem. Otherwise, it can cause failure or malfunction of the system.
• If using the product in an interlocking circuit:
  • Provide a double interlocking system, for example, a mechanical system.
  • Check the product regularly for proper operation.
  Otherwise, malfunction can result, causing an accident.
• The following instructions must be followed during maintenance:
  • Turn off the power supply.
  • Stop the air supply, exhaust the residual pressure, and verify that the air is released before performing maintenance.
  Otherwise, an injury can result.
• Verify the system sufficiently before judging the applicability when a permeable workpiece is to be sucked. Rapid decrease in vacuum pressure during suction of the workpiece may cause the ejector to fail to restart in time, causing injury or damage to the system because of the suction failure.

Caution Instructions

• Do not touch the terminals and connectors while the power is on. Otherwise, electric shock, malfunction, or damage to the product can result.
• Perform sufficient trial run. Otherwise, injury or damage to the system can result due to suction failure depending on the conditions of the workpiece suction or the pressure switch settings. Perform sufficient verification before using this product.
• After maintenance is complete, perform appropriate functional inspections and leak tests. Stop operation if the equipment does not function properly or there is a leakage of fluid. When leakage occurs from parts other than the piping, the product might be faulty. Disconnect the power supply and stop the fluid supply. Do not apply fluid under leaking conditions. Safety cannot be assured in the case of unexpected malfunction.

Names and Functions of Product

• Output (OUT1) display (Green): LED is ON when the switch output (OUT1) is turned ON.
• Output (OUT2) display (Red): LED is ON when the supply pilot valve is ON.
• LED display: Displays the current status of pressure, setting mode, and error code.
• [UP] button: Selects the mode or increases the ON/OFF set value. Press this button to change to the peak display mode.
• [DOWN] button: Selects the mode or decreases the ON/OFF set value. Press this button to change to the bottom display mode.
• [SET] button: Press this button to change to either mode and to set a value.

Installation

Wiring

Connection

• Connections should only be made with the power supply turned off.
• Use separate routes for the pressure switch wiring and any power or high voltage wiring. Otherwise, malfunction may result due to noise.
• Ensure that the FG terminal is connected to ground when using a commercially available switch-mode power supply. When a switch-mode power supply is connected to the product, switching noise will be superimposed, and the product specifications can no longer be met. This can be prevented by inserting a noise filter (such as a line noise filter and ferrite core) between the switch-mode power supply and the product, or by using a series power supply instead of a switch-mode power supply.

Connector

Connecting/Disconnecting:

• When mounting the connector, insert it straight into the socket, holding the lever and connector body, and fit the hook of the lever into the groove in the housing to lock.
• When removing the connector, press down the lever to release the hook from the groove and pull the connector straight out.

Pin No. of the Connector (Power supply and output cable for the digital pressure switch and pilot valve)

[Diagram description: A diagram showing connector pins with labels. Specific pin numbers and functions are not detailed in the text, but the context implies standard electrical connections.]

Internal circuit and wiring example

• NPN output type: NPN open collector 2 outputs (OUT1: General purpose, OUT2: Valve control), Max. applied voltage 26.4 VDC, Max. load current 80 mA, Residual voltage 2 V or less.
• PNP output type: PNP open collector 2 outputs (OUT1: General purpose, OUT2: Valve control), Max. load current 80 mA, Residual voltage 2 V or less.

Easy Setting

See below for the energy-saving control operation and the set values which are preset to the switch. If the operation shown below does not cause any problems, keep these settings.

Operation of OUT1

When the pressure exceeds the set value (P_1), the pressure switch turns ON. When the pressure decreases below the set value (P_1) by the hysteresis value (H_1), the switch turns OFF. The default settings are P_1: -70.0 kPa and H_1:10.0 kPa.

Operation of OUT2

Supply pilot valve: OUT2 is turned on by the signal for suction. Suction starts by the generation of vacuum pressure. When the vacuum pressure reaches the set value (P_1), the supply pilot valve turns OFF. After the supply pilot valve is turned off, the vacuum pressure will decrease. When the vacuum pressure drops below (P_1) by the amount set in (P_2), the supply pilot valve will turn on again and increase vacuum pressure. After that, the supply pilot valve will turn ON and OFF repeatably. Default setting is H_2: 5.0 kPa.

*: When turning off the supply pilot valve with a vacuum pressure that is higher than the set value (P_1), and for other setting methods, refer to the operation manual which can be obtained from the SMC website (http://www.smcworld.com).

<How to change the set value>

[Normal output (OUT1)]

1. Press the [SET] button once in measurement mode.
2. "P_1" and the set value are displayed alternately.
3. Press the [UP] or [DOWN] button to change the set value. The [UP] button increases vacuum pressure, and the [DOWN] button decreases it.
   • Press the [UP] button once to increase the value by one digit; press and hold to continuously increase.
   • Press the [DOWN] button once to decrease the value by one digit; press and hold to continuously decrease.
4. Press the [SET] button to complete the setting of "P_1". The display shows [H_1] and the set value alternately. The [UP] button increases, and the [DOWN] button decreases the set value.
5. Press the [SET] button to complete the setting of "H_1". The display shows [H_2] and the set value alternately. The [UP] button increases, and the [DOWN] button decreases the set value.
6. Press the [SET] button to complete the setting.

When the reversed output is changed, the following parameters are displayed, and each set value can be changed using the method shown above.

[Reversed output (OUT1)]

[Description: This section indicates that similar steps apply for reversed output settings, involving changing parameters like P_1, H_1, and H_2.]

Function Setting

Measurement mode

The measurement mode is the condition where the pressure is detected and indicated, and the switch function is operating. This is the basic mode; other modes should be selected for setting changes and other function setting changes.

[Diagram description: A flow diagram showing transition from Measurement mode to Function selection mode by pressing the [UP] button for 2 seconds or longer. From Function selection mode, pressing the [UP] button for 2 seconds or longer returns to Measurement mode.]

Function selection mode

In measurement mode, press the [UP] button for 2 seconds or longer to display [F 0]. Select the function setting to be changed, [Fxx]. Press the [UP] button for 2 seconds or longer in function selection mode to return to measurement mode.

Default setting

The default settings are as follows. Refer to the operation manual on the SMC website (http://www.smcworld.com) when changing the settings.

[F 0] Unit conversion function

[F 1] Setting of OUT1

[F 2] Setting of OUT2

[F 3] to [F99] Setting

Other Settings

• Peak/Bottom hold value indication: [Description: This feature allows viewing peak or bottom values. Specific settings are detailed in the full operation manual.]
• Zero clear:
  • Zero clear of indication: Indication is reset to zero when the [UP] and [DOWN] buttons are pressed simultaneously for 1 second.
  • For the first operation, perform zero clear without pressure supply.
• Key lock: Refer to the operation manual on the SMC website (http://www.smcworld.com) for the settings shown above.

Maintenance

How to reset the product for power cut or forcible de-energizing

The setting of the product will be retained as it was before a power cut or de-energizing. The output condition is also basically recovered to that before a power cut or de-energizing, but may change depending on the operating environment. Therefore, check the safety of the whole system before operating the product.

If the system is using accurate control, wait until it has warmed up (approximately 10 minutes).

[F99] Reset to the default setting

If the setting of the pressure switch becomes unknown, the default setting can be restored.

<Operation>

1. Press the [UP] or [DOWN] button in function selection mode to display [F99].
2. Press the [SET] button. Move on to reset to the default setting.
3. Set the display to [ON] by pressing the [UP] or [DOWN] button, then press the [UP] and [DOWN] buttons simultaneously for 5 seconds or longer.

[Diagram description: A sequence showing the display changing from "OFF" (unused) to "ON" (resetting) and then confirming the reset. The process involves selecting "ON" and holding two buttons.]

All settings are returned to the default values.

Press the [SET] button to confirm selection.

Return to function selection mode.

Setting of [F99] Reset to the default setting completed.

Troubleshooting

Error indication

This function is to display error location and content when a problem or an error occurs.

If the error cannot be reset after the above measures are taken, please contact SMC.

Specification

Refer to the operation manual on the SMC website (http://www.smcworld.com).

Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.

©2012-2016 SMC Corporation All Rights Reserved

Model Number: ZL3-OM00201A