The provided document is the "Assembly- and Operating Manual" for the SCHUNK PGL-plus-P 2-Finger Parallel Gripper. This manual, translated from the original, covers various aspects of the product, including its design, technical data, assembly, troubleshooting, and maintenance.
Function Description
The SCHUNK PGL-plus-P is a universal 2-finger parallel gripper designed for gripping and temporarily holding workpieces or objects. It features a large jaw stroke and is equipped with a multi-tooth guidance system, which allows for high maximum moments. The gripper is intended for installation in machines or automated systems and is suitable for industrial and industry-oriented use. It can be used for holding workpieces during simple machining operations within permissible load limits and technical data, though it is not classified as a clamping device according to EN 1550:1997+A1:2008.
A notable variant is the PGL-plus-P with an integrated sensor system (IOL). This variant has a sensor integrated directly into the gripper, allowing for monitoring of positions across the entire stroke via an IO-Link interface. The "Gripper closed" and "Gripper open" positions are factory-set for this variant.
The gripper operates pneumatically, utilizing compressed air as its pressure medium. It is designed to be robust, with features like an air purge connection to prevent dirt penetration, achieving a protection class of IP67 when used.
Important Technical Specifications
The manual provides detailed technical data for the PGL-plus-P, covering connection data, ambient conditions, and operating conditions.
General Specifications:
- Pressure Medium: Compressed air, quality according to ISO 8573-1: 7:4:4.
- Nominal Operating Pressure: 6 bar.
- Minimum Pressure:
- Without gripping force maintenance: 2.5 bar.
- With gripping force maintenance (AS/IS): 4 bar.
- Maximum Pressure:
- Without gripping force maintenance: 8 bar.
- With gripping force maintenance (AS/IS): 6.5 bar.
- Pressure Range for Air Purge: 0.5 – 1 bar.
- Ambient Temperature:
- Min.: 5 °C.
- Max.: 90 °C.
- Max. (high-temperature variant V): 130 °C.
- Max. (with integrated sensor system IOL): 70 °C.
- Protection Class IP: 64 (achieves IP67 with air purge).
- Noise Emission: ≤70 dB(A).
Integrated IO-Link Sensor (PGL-plus-P-IOL Variant) Specifications:
- Nominal Voltage: 24 VDC (Min. 18 V, Max. 30 V).
- Residual Ripple Supply Voltage: ≤ 2 % Vss.
- Nominal Current: ≤ 200 mA.
- Short Circuit Protection: Yes.
- Inverse-Polarity Protection: Yes.
- Material (Sensor Housing): PBT GF15 / stainless steel 430 f.
- Material (Active Sensor Surface): PBT GF20.
- Cable Connector: M8 connector, 4-pin.
- Specification: V1.1.
- Transmission Rate: COM2.
- Port: Class A.
- Protection Class IP (Sensor): 67.
- Protection Class (Sensor): 3.
- Ambient Temperature (Sensor): Min. -25 °C, Max. 70 °C.
- Max. Linearity Deviation from Final Value: 1.5 % (at nominal operating pressure, room temperature, without air purge).
- Resolution: 0.025 mm (at nominal operating pressure, room temperature, without air purge).
- Detectable Workpiece Difference: 0.1 mm (at nominal operating pressure, room temperature, without air purge).
- Response Time / Typ. Switching Time / Cycle Time: 2.7 ms.
The warranty period for the PGL-plus-P is 36 months from the ex-works delivery date, provided it is used as intended, ambient conditions are observed, and maintenance intervals are followed. The warranty covers up to 30 million cycles.
Usage Features
The PGL-plus-P gripper offers several features for flexible and safe operation:
- Mounting Flexibility: The product can be assembled from four sides, providing versatility in integration into various systems. It supports hose-free direct connections for compressed air, as well as traditional hose connections.
- Sensor Integration: The gripper is prepared for the use of various sensors, including inductive proximity switches (IN 80), magnetic switches (MMS 22, MMS 22-PI2, MMS 22-PI1, MMS 22-IOL, MMS 22-A). The IOL variant comes with an integrated sensor system, simplifying setup.
- Adjustable Sensors: For magnetic switches, setting dimensions are provided for both left and right cable outlets, allowing for precise positioning. Programmable magnetic switches (MMS 22-PI1) can be set in "Standard mode" or "Optimal Mode," where the sensor identifies its optimal position.
- Additional Structure: An optional additional structure can be attached, for example, to support workpieces.
- Safety Features: The manual emphasizes safety, with warnings regarding unexpected movements, contact with lubricants, lifting heavy loads, and sharp edges. It stresses the importance of qualified personnel, personal protective equipment, and adherence to safety regulations. The product is designed to prevent unintended release of energy, and users are instructed to switch off power and secure against restarting before any work.
Maintenance Features
Maintenance is crucial for the longevity and safe operation of the PGL-plus-P.
- Maintenance Intervals: The product is generally maintenance-free under normal ambient and operating conditions. However, regular visual inspections are recommended. In extreme conditions (contaminated environments, high temperatures, or non-compliant compressed air quality), cleaning, damage/wear checks, relubrication, and seal replacement are required.
- Lubrication: SCHUNK recommends specific lubricants (Rivolta F.L.G. GT-2) for metallic sliding surfaces, all seals, cylinder surfaces, and serration. Lubricants should be applied thinly with a lint-free cloth. Food-compliant lubricants are used as standard, though they may not fully meet EN 1672-2:2020 requirements. Contaminated food-compliant lubricants must be changed.
- Seal Replacement: Detailed instructions are provided for changing seals for variants without gripping force maintenance, with "O.D. gripping" gripping force maintenance, and with "I.D. gripping" gripping force maintenance. It is recommended to have SCHUNK perform seal changes, especially for variants with gripping force maintenance due to the precise alignment required for the cylinder piston and the presence of spring tension.
- Sensor Replacement (IOL variant): Instructions are given for removing and installing the integrated IO-Link sensor. Before removal, sensor data can be read out and transferred to the new sensor. New sensors and O-ring seals are available from SCHUNK.
- Tightening Torques: A table of specific tightening torques for various screws is provided to ensure correct assembly and prevent damage.
- Troubleshooting: The manual includes a comprehensive troubleshooting section covering common issues such as the product not moving, not executing the complete stroke, opening/closing abruptly, dropping gripping force, and communication issues with the IOL variant. Corrective actions range from checking air supply and mounting surfaces to cleaning, lubricating, and replacing components.
The manual also includes declarations of incorporation and conformity (EU and UKCA) to ensure compliance with relevant machinery directives and regulations.
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