3.1 Basic Information
The Safety light grid SLG 422/ 425I-P is a self-checking electro-sensitive protective system based on infrared light.
The system is offered in two variants:
SLG 422P
SLG 425IP
The system can be used for
- Safeguarding of danger zones
- Safeguarding of access areas
- Automatic material transport
3.2 Features
The system is composed of a transmitting-/receiving-unit and a reflection-mirror. No additional switching
elements are required for the functions described. A comfortable software program for diagnosis and function
selection is available. For this purpose a BUS-Converter NSR-0801 is available (see Accessories).
The SLG 422/425IP grids provides following properties:
- start interlock
- restart interlock
- relay monitoring EDM (only 422P)
- muting (only 425IP)
3.3 Safety Functions
The SLG 422/ 425I-P System without accessories offers a great variety of functions. The following table shows the
possible functions and the system configuration of the factory settings.
3.3.1 Start interlock
The start interlock prevents an automatic machine start after power ON.
After release of the start interlock by a single interrupt of the detection zone this protection function will be
inactive until the next voltage reset.
When delivered the start interlock is not active. This function can be activated using the BUS-Converter
NSR-0801 and a PC / Laptop (see manual NSR-0801).
3.3.1.1 Automatic mode (Automatic start after release of detection zone)
The Automatic mode function switches the OSSD outputs ON (detection zone not interrupted) without external
release of a switching device. This mode of operation must be selected in combination with the restart
interlock of the machine. This degree of protection initiates an automatic restart of the machine while the protective zone
is not interrupted. Do not select this operation mode when operators can pass through the protective zone.
This operation mode can be selected via cable link between the connections DIAG OUT and Release.
DIAG OUT
Release/Override
serious injury or death.
3.3.2 Restart Interlock
The Restart Interlock prevents an automatic release of the outputs (OSSDs ON) after feeding in the line
voltage or after an interruption of the protective zone.
The system switches the output back to ON, if an external device (restart button) creates a release signal on the
input Restart (receiver).
Page 2
Subject to technical changes
! Warning
When this mode is selected, operators or maintenance workers may enter the danger area without detection. Take
care by the control system of the machine that restart interlock is always active. Failure to do so may result in
BUS-Converter NSR-0801
Relay monitoring EDM/muting (see 3.2)
Safety light grid SLG 422/ 425I-P
-
not active
BUS-Converter NSR-0801
Start interlock
not active
Restart Interlock
active
Function
Factory settings
Configuration
3 Description
