Product Summary
The GL-VM20LN is a metal Type 4 safety light curtain from the Keyence GL-V series. It uses 20 infrared beam axes for body protection. The GL-VM20LN offers a 760 mm detection height and an 800 mm total length. It runs on 24 VDC and gives NPN OSSD output. The housing meets IP65/IP67 for tough plant areas.
Short Description
- Keyence GL-V series Type 4 safety curtain
- 20 beams with 40 mm spacing
- 45 mm minimum object detection
- 760 mm detection height
- 0.3 to 15 m detecting distance
- NPN transistor OSSD output x2
- Fast response at max. 4.6 ms
- IP65/IP67 metal housing
Technical Data
- Brand: Keyence
- Model: GL-VM20LN
- Series: GL-V series
- Type: Type 4 ESPE / AOPD set
- Function: Body protection
- Beam axes: 20
- Beam spacing: 40 mm
- Detection height: 760 mm
- Total length: 800 mm
- Object size: ø45 mm
- Distance: 0.3 to 15 m
- Light source: Infrared LED, 850 nm
- Sync: Optical synchronization
- Aperture: Up to ±2.5° at 3 m or above
- Output: NPN transistor x2, OSSD
- Response: Max. 4.6 ms, channel 0, ON to OFF
- Supply: 24 VDC -20/+25%, Class 2
- Load current: 150 mA or less
- Residual ON: Up to 2.5 V at 5 m cable
- OFF voltage: Up to 2.0 V at 5 m cable
- Leakage: Up to 0.8 mA
- Load capacity: 0.8 µF
- Wiring resistance: Up to 2.5 Ω
- Input current: Approx. 3 mA short circuit
- Transmitter draw: Max. 100 mA
- Receiver draw: Max. 113 mA
- Ports: None
- Protocols: None
- Weight: Transmitter 530 g; receiver 530 g
Series Insight
- GL-V series keeps 40 mm pitch on body guard models
- Wider pitch cuts beam count for torso detection
- Optical sync removes a dedicated sync line
- Series link blocks cross talk between two units
- Metal case resists weld spatter and panel dust
- Output type splits by suffix, NPN or PNP
Oiltech Controls Review
- Good pick for openings around 760 mm tall
- 40 mm pitch trims wiring versus hand guard types
- NPN output fits many legacy safety relays
- 4.6 ms response suits most press and robot cells
- IP67 body holds up in coolant and dust areas
- Strong option for retrofit on older guard frames
Best Suited Equipment
- Press brake and forming machine guards
- Robot cell perimeter doors
- Conveyor and material transfer gates
- Palletizing and stacking stations
- Packaging and case sealing machines
- Automated assembly and test cells
- Legacy control system retrofits
Environmental Tolerance
- Operating: -30 to +55 °C, no freezing
- Storage: -30 to +70 °C, no freezing
- Humidity: Up to 95 % RH, no condensation
- Ambient light: 3,000 lux lamp; 20,000 lux sun
- Rating: IP65/IP67, IEC60529
- Overvoltage: Category II
- Vibration: 5 to 150 Hz, 1G, 10 cycles X/Y/Z
- Shock: 15 G, 6 ms, 100 times X/Y/Z
Housing and Build
- Main unit in aluminum alloy
- Upper and lower case in PPS GF40%
- Front cover in polycarbonate and SUS304
- Transmitter weight 530 g
- Receiver weight 530 g
- Dimensions not published by maker
Certifications
- IEC61496-1/-2, Type 4 ESPE/AOPD
- EN ISO13849-1, Category 4, PL e
- IEC61508, SIL3
- UL60947-1 / CSA C22.2 No.60947-1
- UL1998
- IEC/EN61496-1
- EN55011 Class A
- FCC Part15B Class A
- ICES-003 Class A
Mounting Notes
- Face transmitter and receiver across the opening
- Keep beam path clear of tooling and fixtures
- Hold distance between 0.3 m and 15 m
- Match guard height to the 760 mm detection span
- Feed 24 VDC Class 2 with correct polarity
- Wire NPN OSSD into a safety relay or PLC
- Route cables away from drives and contactors
Setup and Service
- Optical sync removes extra alignment wiring
- Switch setting blocks cross talk between two units
- Wipe the front cover to clear dust and oil film
- Recheck alignment after panel or guard work
- Verify OSSD state after any wiring change
- Confirm 4.6 ms response against machine stop time
Diagnostics
- OSSD turns OFF when any of 20 beams is blocked
- Output state gives fast fault confirmation
- Supply draw helps spot wiring or load faults
- Reverse supply and short circuit protection built in
- Surge protection supports unstable plant power
Compatibility Notes
- NPN output suits sourcing PLC inputs
- Check relay input type before wiring
- No ports, no protocols, no expansion needed
- Fits 24 VDC systems with 10% or less ripple
- Series connection supports two units only
Why Buy From Oiltech Controls?
- Over 15 years supplying automation spare parts
- Shipping to most countries worldwide
- Surplus and refurbished units tested before sale
- 12-month warranty on eligible items
- Each order checked by a technician before dispatch
- Help with discontinued and legacy control gear
- Fast dispatch within 24 to 28 hours
- Delivery by FedEx, UPS, and DHL
Packing List and Warranty
- GL-VM20LN transmitter x1
- GL-VM20LN receiver x1
- Protective packing x1 set
- Shipping documents x1 set
- 12-month warranty on eligible products
- Warranty covers defects in normal use
- Dispatch in 24 to 28 hours
- Shipment by FedEx, UPS, or DHL
FAQ
Q: What output type does the GL-VM20LN use?
A: It uses NPN transistor output x2, also called OSSD. Check your PLC or relay input type first. NPN suits sourcing inputs.
Q: Is 45 mm object detection enough for body protection?
A: Yes. Body protection needs larger objects than hand protection. The 45 mm size and 40 mm pitch fit torso and arm detection.
Q: How does it compare with the GL-VM20HN?
A: The GL-VM20HN is a hand protection model with 20 mm pitch. This unit uses 40 mm pitch for body guarding.
Q: What should I check before buying a used unit?
A: Ask for the output type, lens condition, and test record. Also confirm the 20 beam count and 800 mm length match your guard.
Q: Do I need a matching transmitter and receiver?
A: Yes. Always pair units from the same model. Mixed pairs may fail alignment and beam counting.
Contact Oiltech Controls
Email: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
Website: https://www.oiltechcontrols.com/
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