The Keyence GL-VM104HN is a Type 4 safety light curtain transmitter and receiver set with 104 beam axes and a 2060 mm detection height. It operates from a 24 VDC supply and provides two NPN transistor OSSD outputs for reliable hand protection in automated machinery.
Reliability and Serviceability in Safety Light Curtains
From a maintenance engineer's perspective, the GL-VM104HN is designed for stable long-term operation. Its aluminum alloy housing and polycarbonate front cover withstand harsh conditions, while the IP65/IP67 rating ensures resistance to dust and water ingress. The optical synchronization eliminates the need for a dedicated sync line, simplifying wiring and reducing potential failure points.
Key Specifications of This unit
- Supply voltage: 24 VDC -20/+25%, ripple (P-P) 10% or less, Class 2
- Output current: Maximum load current 150 mA or less per OSSD
- Isolation: Optical synchronization between transmitter and receiver
- Detection height: 2060 mm with 20 mm beam spacing
- Response time: max. 8.2 ms (OSSD, channel 0, ON→OFF)
- Protection rating: IP65/IP67 (IEC60529)
- Safety standards: IEC61496-1/-2 Type 4, EN ISO13849-1 Category 4 PL e, IEC61508 SIL3
Installation and Setup
Mount the transmitter and receiver at the specified detecting distance of 0.3 to 15 m. Verify alignment using the effective angular aperture of up to ±2.5° at 3 m or above. Connect the 24 VDC supply observing polarity; the protection circuit guards against reverse connection. For series connection of up to two units, configure the interference prevention switch accordingly.
Maintenance and Reliability
Periodically inspect the front cover for scratches or contamination that could affect beam transmission. The ambient light immunity (incandescent 3,000 lux or sunlight 20,000 lux) ensures stable operation in varied lighting. With no moving parts, the primary wear items are the optical surfaces; clean with a soft cloth and mild detergent as needed. The robust PPS and aluminum construction resists vibration (5 to 150 Hz, 1G) and shock (15 G, 6 ms).
Troubleshooting Common Issues
If the OSSD does not turn ON, check that all beam axes are received and that the supply voltage is within tolerance. Verify load wiring resistance does not exceed 2.5 Ω and leakage current is below 0.8 mA. For persistent issues, consult the official Keyence documentation or contact AutoDCSTech for engineering-grade support.
Availability & Condition at AutoDCSTech
| Part Number | GL-VM104HN |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | Japan |
