Note:
1. For safety reasons we recommend to store all inspection results.
2. The person conducting an inspection must be familiar with the functions of ALFA 4 and the machine.
3. If installer, design technician and user are different people make sure to provide sufficient information
to enable the user to carry out the maintenance.
10.1 Inspection according to machine maintenance
3. The safety distance of the application is bigger than the calculated distance.
4. The optical cover is neither scratched nor dirty.
Turn the machine on and check whether the hazardous movement stops under the following conditions:
5. Dangerous machine parts move while the protective zone is uninterrupted.
7. Hazardous machine movement continues after switching off the power supply of SLG 422/ 425 IP.
10.2 Inspection every 6 months
Check the following items in intervals of 6 months or as soon as machine settings have been changed:
2. The machine or connection modification has no effect on the control system.
3. The outputs of SLG 422/ 425 IP are properly wired to the machine.
4. The total response time of the machine is lower than the calculated response time.
5. Cables and plugs of SLG 422/ 425 IP are in flawless condition.
6. The brackets, end caps and cables are secured tightly.
10.3 Cleaning
If the optical cover of the sensors is extremely dirty the outputs OSSD of SLG 422/ 425 IP may be switched off.
Clean it with a clean soft cloth without applying pressure. Do not use aggressive, scouring or scratching
detergents which might attack the surface.
11 Contact
Support / Sales:
Please contact your countries local Schmersal agency.
Agencies worldwide are listed at www.schmersal.com website.
Service Repairs:
Safety Control GmbH
Am Industriepark 11
84453 Mühldorf
Tel.: +49 (0) 8631-18796-0
Fax: +49 (0) 8631-18796-1
Please see www.schmersal.com for more detailed information about our products.
Subject to technical changes
Page 25
1. Approaching the protective zone is only possible across the protection zone of the SLG 422/ 425 IP.
1. Protective zone can only be reached by interrupting a light beam (machine stops).
Never use ALFA 4 before the inspection have been completed as described in the paragraphs below.
Improper inspection may lead to serious injuries or death.
10 Safety instructions - Maintenance
! Attention
2. No operators are within the protective zone while dangerous machine parts are in action.
6. Dangerous machine movement stops immediately if one or more beams are interrupted.
Safety light grid SLG 422/ 425I-P
