PEPPERL+FUCHS SLVA-4Kplus Safety Light Curtain Guide

DIP switch function table

Switch position function

1+5 OFF without start/restart interlock (automatic restart)

ON with start/restart interlock (requires manual reset)

2+6 OFF without relay monitoring (EDM disabled)

ON with relay monitoring (EDM enabled)

3+7 OFF channels 3 and 4 serve as light curtain channels

ON channels 3 and 4 are used as emergency stop circuit channels

The 4+8 OFF emergency stop circuit is in static mode (24V DC level)

The ON emergency stop circuit is in pulse mode (12V pulse)

Important Notice:

When using the emergency stop circuit, the start/restart interlock (required by EN 418) must be enabled to prevent automatic restart after unlocking the emergency stop.

When using pulse emergency stop, it is necessary to ensure that DIP switches 3+7 and 4+8 are both set to ON (i.e. XX11 XX11), otherwise channel simultaneity monitoring will be lost, posing a safety hazard.

After changing the DIP switch, the control unit will immediately enter a safe state (output turned off), the 7-segment digital display will show "P", and the 15-16 terminal output will flash. All functional tests must be completed in accordance with Chapter 6 before it can be put into operation.

The modified settings should be marked in the corresponding box on the product nameplate.

Chapter 4: Installation and Wiring Specifications

4.1 Installation of control unit

The SLVA-4Kplus is installed on DIN rails (compliant with EN 50022-35 standard, 35mm wide). Insert the bottom of the control unit into the upper edge of the guide rail, then push it downwards, and the spring locking device will fix it. When disassembling, use a screwdriver to pull the locking device backwards to remove it. During installation, sufficient space should be reserved above the terminal block for inserting a screwdriver.

4.2 Wiring of Light Curtain Transmitter and Receiver

The transmitter is connected to the terminal pair by color coding:

Channel 1:25-26

Channel 2:27-28

Channel 3:29-30

Channel 4:31-32

The receiver is connected to:

Channel 1: 7-8-9

Channel 2: 7-8-10

Channel 3:11-12-13

Channel 4:11-12-14

If less than 4 channels are used, unused channels must be replaced with short-circuit wires, with a short-circuit length not exceeding 3m:

Channel 1 unused: Short circuit terminals 25 and 9

Channel 2 unused: Short circuit terminals 27 and 10

Channel 3 unused: Short circuited terminals 29 and 13

Channel 4 unused: Short circuited terminals 31 and 14

4.3 Emergency stop circuit wiring

Static emergency stop: Connect the normally open contact (or safety relay contact) of the emergency stop switch in series with the receiver input circuit of channel 3/4. Due to the loss of cross circuit monitoring, emergency stop cables must be individually armored or laid with two independent cables. The current of the emergency stop circuit is about 10 mA.

Pulse emergency stop: Connect the emergency stop switch contacts to the transmitter output and receiver input respectively, and use the short-circuit and crossover circuit monitoring functions inside the control unit, without the need for special mechanical protection for the cable. The emergency stop switch should be suitable for small loads (low current).

4.4 Wiring of indicator lights

OSSD status indicator light (red/green): connected to terminals 5-6. It can directly drive red and green LEDs in anti parallel (without resistance), with a current of about 9mA. If a larger current indicator light is needed, the 2528 option (relay output) can be selected.

Ready to start indicator light (yellow): connected to terminals 15-16 (passive contacts), requires an external 24V power supply. When this light is on, it indicates that the system is waiting for startup enable.

4.5 Safe Output (OSSD)

Terminals 19-20 and 21-22 are two independent normally open contacts without cross circuit monitoring. When connecting to the machine control system, protective cables or short-circuit protection measures should be used. The output contact voltage must meet the safety isolation requirements.

Inductive load: Users must parallel RC absorption circuits or freewheeling diodes at both ends of the contacts (note that freewheeling diodes will prolong the relay release time).

DC load: Pay attention to the contact capacity (see Chapter 7 Load Curve).

Contact switching frequency: maximum once per second.

Chapter 5: Debugging and Functional Testing

After completing the installation and wiring, follow the steps below to debug.

5.1 Optical path adjustment

The transmitter emits red visible light for easy alignment. First adjust the transmitter to align the light spot with the receiver (either by looking directly at the transmitter or using a reflector). Then adjust the angle of the receiver until its indicator light is on and the stability control is sufficient (see 2.6.3 Indicator light status).

5.2 Testing Capability

Use a test rod of the specified diameter to block each beam of light one by one, and confirm:

The output relay is turned off, and the OSSD indicator light changes from green to red.

The corresponding channel receiving indicator light on the control unit is off.

All beams can reliably trigger safe outputs.

5.3 Start/restart interlock test (if enabled)