GL-VM28LP Keyence Body Protection Light Curtain | 28 Beam PNP

GL-VM28LP Keyence Safety Light Curtain: Long Body Protection for Wide Access Zones

The GL-VM28LP is a Type 4 safety light curtain from the Keyence GL-V series. It carries 28 beam axes at 40 mm spacing. Detection height reaches 1080 mm. Total length is 1120 mm. This body protection model guards wide machine openings. It runs on 24 VDC with PNP OSSD outputs. Response time is max. 5.0 ms. Optical synchronization removes the sync wire. The metal housing holds IP65/IP67 protection.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts supply.
• Global shipment support via FedEx, UPS, and DHL.
• Tested industrial surplus and refurbished options.
• 12-month warranty on all GL-VM28LP units.
• Technical verification before every dispatch.
• Backing for obsolete and discontinued control systems.

GL-VM28LP Data Sheet Snapshot

• Brand: Keyence
• Model: GL-VM28LP
• Series: GL-V series
• Type: Type 4 ESPE / AOPD, body protection
• Beam axes: 28
• Beam spacing: 40 mm
• Detection height: 1080 mm
• Total length: 1120 mm
• Minimum object: ø45 mm
• Detecting distance: 0.3 to 15 m
• Response time: Max. 5.0 ms, OSSD ON→OFF
• Light source: Infrared LED 850 nm, Exempt Group
• Synchronization: Optical
• Interference prevention: Up to 2 units in series

Electrical Profile

• Supply voltage: 24 VDC -20/+25%, ripple 10% or less, Class 2
• OSSD output: Transistor x2, PNP
• Maximum 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
• Max load capacity: 0.8 µF
• Load wiring resistance: Up to 2.5 Ω
• Input short-circuit current: Approx. 3 mA
• Current draw: Transmitter max. 123 mA; receiver max. 136 mA
• Protection circuit: Reverse supply, per-output short-circuit, surge

Environment and Build

• Operating temperature: -30 to +55 °C, no freezing
• Storage temperature: -30 to +70 °C, no freezing
• Relative humidity: Up to 95 % RH, no condensation
• Ambient light: 3,000 lux incandescent; 20,000 lux sunlight
• Protection rating: IP65/IP67 per IEC60529
• Overvoltage category: II
• Vibration resistance: 5 to 150 Hz, 1G, 10 cycles X/Y/Z
• Shock resistance: 15 G, 6 ms, 100 times X/Y/Z
• Material: Aluminum alloy body; PPS GF40% case; polycarbonate and SUS304 front cover
• Weight: Transmitter 730 g; receiver 740 g

Standards and 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

Oiltech Controls Insight: Reading the GL-VM28LP

• 28 beams over 1080 mm give full torso coverage.
• 40 mm spacing targets body detection, not hand detection.
• PNP OSSD suits European and US safety relay inputs.
• 5.0 ms response handles most machine stop loops.
• 1120 mm body fits wide pallet and conveyor openings.
• Optical sync trims wiring in long guard runs.
• Best pick when reach-over risk is the main hazard.

Where the GL-VM28LP Fits Best

• Palletizing and de-palletizing cells.
• Wide conveyor transfer points.
• Large robotic work envelopes.
• Material entry and exit on press lines.
• Vertical guarding on wide machine fronts.
• Automated storage and retrieval interfaces.
• Retrofit zones needing tall body coverage.

Wiring and Alignment Steps

• Mount transmitter and receiver face to face.
• Keep span from 0.3 m to 15 m.
• Align units within ±2.5°.
• Feed 24 VDC Class 2 power.
• Wire PNP OSSD to the safety relay.
• Confirm all 28 beams for ON state.
• Set the interference switch for 2-unit series use.

Lead Time, Shipping, and Warranty

• Dispatch within 24 to 28 hours of order.
• Shipping by FedEx, UPS, or DHL.
• 12-month warranty from Oiltech Controls.
• Technical check before shipment.
• Email info@oiltechcontrols.com for stock and lead time.
• WhatsApp +86 158 8020 0923 for fast quotes.

Professional FAQ

Q: When should I pick the GL-VM28LP over a 4-beam model?

A: Choose 28 beams when the opening is tall enough for a person to walk or reach through. The 4-beam model covers small apertures only.

Q: Does 40 mm beam spacing detect a hand?

A: No. A ø45 mm minimum object means fingers and hands can pass between beams. Use a hand protection model with 20 mm or 25 mm spacing for that risk.

Q: My safety relay expects PNP. Is this unit a direct fit?

A: Yes. The GL-VM28LP uses PNP OSSD outputs. They source current to the load, which matches most European and US relay inputs.

Q: Can I mount two GL-VM28LP units in one cell?

A: Yes. Use the interference prevention switch and series connection. This supports up to 2 units without cross-talk.

Q: What is the most common field fault on this model?

A: Misalignment after machine vibration. Recheck the ±2.5° angle and clean the front cover before replacing hardware.

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