GL-VM20LP Keyence GL-V Series Type 4 Safety Light Curtain

GL-VM20LP Keyence GL-V Series Type 4 Safety Light Curtain

GL-VM20LP is a Type 4 safety light curtain from the Keyence GL-V series. It uses 20 beam axes for body protection. Beam spacing is 40 mm. It detects a ø45 mm object. Total length is 800 mm. Detection height is 760 mm. The metal body suits tough machine frames. The set includes a transmitter and receiver. Optical synchronization keeps wiring clean. PNP OSSD output drives safety relays. Response time is max. 4.6 ms. Range is 0.3 to 15 m. Rating is IP65/IP67. Safety level is Type 4, Category 4, PL e, SIL3.

Core Technical Data

• Brand: Keyence
• Model: GL-VM20LP
• Series: GL-V series
• Module Type: Type 4 ESPE / AOPD light curtain
• Protection Type: Body protection
• Beam Axes: 20
• Beam Spacing: 40 mm
• Detection Height: 760 mm
• Total Length: 800 mm
• Detecting Distance: 0.3 to 15 m
• Min. Object Size: ø45 mm
• Response Time: Max. 4.6 ms

Optical and Output Details

• Light Source: Infrared LED, 850 nm, Exempt Group
• Synchronization: Optical
• Angular Aperture: Up to ±2.5° at 3 m or above
• Detection Mode: ON when all beams are received
• Interference Prevention: Up to 2 units by series connection
• Control Output: Transistor x2, PNP
• Ports: None
• Protocols: None
• Communication Expansion: None

Electrical Data

• Supply Voltage: 24 VDC -20/+25%, Class 2
• Current Consumption: Transmitter max. 100 mA; receiver max. 113 mA
• Load Current: 150 mA or less
• Residual Voltage ON: Up to 2.5 V at 5 m cable
• OFF Voltage: Up to 2.0 V at 5 m cable
• Leakage Current: Up to 0.8 mA
• Load Capacity: 0.8 µF
• Wiring Resistance: Up to 2.5 Ω
• Inputs: Short-circuit current approx. 3 mA
• Protection Circuit: Reverse-connection, short-circuit, surge

Environment and Housing

• Operating Temperature: -30 to +55 °C
• Storage Temperature: -30 to +70 °C
• Humidity: Up to 95 % RH, no condensation
• Ambient Light: 3,000 lux incandescent; 20,000 lux sunlight
• Protection Rating: IP65/IP67
• Overvoltage Category: II
• Vibration: 5 to 150 Hz, 1G, 10 cycles X/Y/Z
• Shock: 15 G, 6 ms, 100 times X/Y/Z
• Material: Aluminum alloy; PPS GF40%; polycarbonate; SUS304
• Weight: Transmitter 530 g; receiver 530 g
• Dimensions: Not available
• Lifecycle: Active, verified 2026-09

Where It Fits

• Body access guarding on machines
• Perimeter protection for robot cells
• Packaging and palletizing zones
• Material handling entry points
• Conveyor and transfer openings
• Obsolete safety curtain replacement

Mounting Notes

• Align transmitter and receiver face to face.
• Keep the 40 mm beam path clear.
• Use the metal body for stable mounting.
• Feed 24 VDC Class 2 power.
• Wire PNP OSSD outputs to the safety circuit.
• Check optical sync after power-up.
• Set interference prevention for two units.

Setup and Service

• Clean the front window with a soft cloth.
• Avoid abrasive cleaners on polycarbonate.
• Recheck alignment after shock or vibration.
• Verify response time after wiring changes.
• Inspect cables for cuts and loose plugs.
• Replace the unit if OSSD output fails.

Compatibility

• Works with safety relays and controllers.
• PNP output matches sourcing logic inputs.
• Optical sync reduces cable runs.
• No built-in port or protocol.
• Series connection supports up to 2 units.
• Fits many retrofit and legacy systems.

Certifications

• Safety: IEC61496-1/-2 Type 4 ESPE/AOPD
• Functional Safety: EN ISO13849-1 Cat. 4, PL e; IEC61508 SIL3
• North America: UL60947-1 / CSA C22.2 No.60947-1; UL1998
• EMC: IEC/EN61496-1; EN55011 Class A; FCC Part15B Class A; ICES-003 Class A

Packing List and Warranty

• 1 x GL-VM20LP transmitter
• 1 x GL-VM20LP receiver
• 1 x Installation guide
• Warranty: 12 months
• Dispatch: 24 to 28 hours
• Shipping: FedEx, UPS, DHL

Diagnostics

• ON state means all 20 beams are received.
• OFF state means beam block or fault.
• Indicator ON confirms power and operation.
• Fast response supports quick machine stop.
• Surge and short-circuit protection cut downtime.
• Optical sync simplifies fault tracing.

Oiltech Controls’s Insight

• Body protection needs 40 mm spacing, not 20 mm.
• Check PNP vs NPN before you order.
• Confirm 800 mm length fits your frame.
• Use two units only with correct switch settings.
• Keep spare units for obsolete lines.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts
• Global shipment support for urgent lines
• Tested surplus and refurbished options
• 12-month warranty on eligible products
• Technical check before dispatch
• Support for obsolete control systems

Contact us: info@oiltechcontrols.com or +86 158 8020 0923.

FAQ

Q: Is GL-VM20LP the same as GL-VM20HP?

A: No. GL-VM20LP is body protection with 40 mm spacing and ø45 mm detection. GL-VM20HP is hand protection with 20 mm spacing and ø25 mm detection.

Q: What is the main use of the 40 mm beam spacing?

A: It covers larger openings where body detection is enough. It reduces beam count and keeps the 800 mm housing shorter than a hand protection model of the same height.

Q: How do I choose between PNP and NPN output?

A: Match the output to your safety relay or PLC input card. PNP sources current to the load. NPN sinks current to ground. Wrong type causes no switching.

Q: Can I mount the GL-VM20LP on a vibrating press frame?

A: Yes, within the rated 15 G shock and 1G vibration limits. Use rigid brackets and recheck alignment after the first production shift.

Q: What should I verify before buying a used GL-VM20LP?

A: Confirm PNP output, test the OSSD channels, inspect the polycarbonate window, and check cable and connector condition. Oiltech Controls verifies function before shipment.

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