Leuze MLD530-RT3M Safety Light Curtain 900mm

Leuze MLD530-RT3M Multiple Light Beam Safety Device

Product Introduction

The MLD530-RT3M belongs to Leuze’s MLD 500 series. This device functions as a transceiver. It emits three infrared beams spaced 400 mm apart.

The protective field covers 0.5 to 6 meters. With the MLD-XM03 accessory, the range extends to 8 meters. Additionally, this safety light curtain includes integrated muting and status indicators. Therefore, you can monitor operation directly on the unit. The housing is yellow aluminum with metal M12 connectors.

Technical Specifications

Safety ratings meet high standards. The MLD530-RT3M achieves Type 4 per IEC/EN 61496 and SIL 3 per IEC 61508. It also reaches PL e and Category 4 under EN ISO 13849-1.

The MTTFd is 204 years, while PFHD sits at 6.6E-09 per hour. Mission time TM equals 20 years. These figures confirm long-term reliability for safety-critical applications.

Optical data includes three beams. The light source is an infrared LED at 850 nm. Mean transmitter power measures 1.369 µW, and the signal shape is pulsed. Moreover, the LED risk group is exempt under EN 62471:2008.

Electrical performance requires a 24 V DC supply. Tolerance ranges from -20% to +20%. Maximum current consumption is 150 mA without external load. You must install an external fuse rated at max. 3 A.

Inputs and Outputs

Digital inputs total four pieces. All accept DC voltage with a high threshold above 18.2 V.

• Pin 1 (RES): Start/restart interlock control

• Pin 3 (EDM): Contactor monitoring input

• Pin 4: Second muting signal

• Pin 8: Muting enable or timeout control

Safety outputs (OSSDs) include two PNP transistor channels. Each delivers up to 380 mA. Maximum load inductance reaches 2,200,000 µH, and load capacity is 0.3 µF. Residual current stays below 0.2 mA. Voltage drop is only 1 V.

One digital switching output on pin 1 signals the OSSD state.

Operating Modes and Functions

The MLD530-RT3M supports multiple functions. You select the operating mode via wiring on connection 1, pin 2 and pin 7.

Available functions include:

• Sequence controlled 2-sensor muting

• Timing controlled 2-sensor muting

• Partial muting

• Muting enable function

• Muting timeout extension

• Start/restart interlock (RES)

• Contactor monitoring (EDM) – selectable

• Alternative connection for second muting signal

Furthermore, response time is 50 ms. Restart delay time equals 100 ms.

Mechanical and Environmental Data

Dimensions are 52 mm wide, 900 mm high, and 64.7 mm deep. The housing uses aluminum with diecast zinc end caps. Lens cover material is PMMA. Housing color is yellow (RAL 1021).

Mounting options include groove mounting or swivel mounts. Net weight is 2,000 g.

Environmental resistance is excellent. Operating temperature ranges from -30°C to 55°C. Storage allows -40°C to 75°C. Relative humidity can reach 95% non-condensing.

Protection rating equals IP67. Protection class is III. Certifications include c CSA US, c TÜV NRTL US, and TÜV Süd.

Connection Details

Two M12 metal connectors are present.

• Connection 1 (8-pin): Machine interface – carries all I/O signals

• Connection 2 (5-pin): Local interface for configuration

Maximum cable length is 100 m. Permissible conductor cross section is 0.25 mm² typically. Cable resistance to load must stay below 200 Ω.

Installation Guidelines

First, mount the Leuze MLD530-RT3M on a stable frame using groove or swivel brackets. Second, align the transceiver toward the corresponding reflector or separate receiver. Third, connect the 8-pin M12 cable to your safety controller.

Meanwhile, use the integrated LEDs and muting indicator to verify alignment. For muting applications, wire two external sensors to pin 4 and pin 8. Finally, apply 24 V DC. The device starts after a 100 ms restart delay.

Packaging List

• 1 x MLD530-RT3M multiple light beam safety device (transceiver)

• 2 x M12 protective caps

• 1 x quick setup leaflet

• 4 x mounting screws for swivel mount

No certificate or warranty document is included.

Shipping Methods

We ship worldwide via Fedex, UPS, or DHL. Tracking numbers are provided within 24 hours.

Frequently Asked Questions (FAQ)

1. Is the MLD530-RT3M a receiver or a transceiver?
It is a transceiver. The MLD530-RT3M contains both emitter and receiver elements for the three beams. However, for extended range up to 8 m, you may need the MLD-XM03 accessory.

2. Can I use this device without muting sensors?
Yes. Simply leave the muting inputs (pin 4 and pin 8) unconnected or at 0 V. The Leuze MLD530-RT3M then operates as a standard safety light curtain with start/restart interlock.

3. What happens if an OSSD output short circuits to 24 V?
The internal short-circuit protection activates. The MLD530-RT3M will enter a fault state and switch both OSSD outputs to a low level within 50 ms.

4. How do I select timing controlled muting?
Apply 0 V to pin 2 and 0 V to pin 7 on connection 1. This selects operating mode 3, 5, or 6 depending on other wiring. Refer to the Leuze wiring table for exact mode mapping.

5. What is the minimum object detection size?
Beam spacing is 400 mm. Therefore, the MLD530-RT3M detects objects larger than 400 mm in height. For finger or hand protection, choose a model with tighter beam spacing.