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11. Checks, maintenance and Proof-Test
11.1 Checks and maintenance
The following checks are regularly required to ensure proper and continuous functioning:
•
Check the switching function
•
Check for signs of manipulation and safety function bypassing
•
Check if the device is mounted and connected securely
•
Check for soiling
Check if the safe function of the whole safety system is working properly, in particular:
•
Every time after initial commissioning
•
Every time after replacing a component
•
After a long downtime
•
After every fault
Regardless of this, the safe functioning of the safety device should be checked at suitable
intervals, e.g. as part of the maintenance schedule of the plant. No maintenance is requi-
red for the device itself.
11.2 Proof-Test
To check the correct function of the device within the framework of a proof test, the follo-
wing steps must be carried out:
Demand the safety function by opening the safety circuit. Check that the safe relay con-
tact 17-18/27-28 and safe semiconductor outputs O1 and O2 are switched off. Check for
correct delay time, too.
Close the safety circuit and start the device again. Ceck that the safe relay contacts
17-18/27-28 and safe semiconductor outputs O1 and O2 are switched on. Check for cor-
rect delay time, too.
If the device doesn't switch on again, the proof-test failed.
ATTENTION!
If the proof test was not passed or if the device was damaged, e.g. after an error, faultless
operation can no longer be guaranteed. In this case, replace the device. Repairs on the
device as well as the opening of the housing may only be carried out by the manufacturer.
H. ZANDER GmbH & Co. KG • Am Gut Wolf 15 • 52070 Aachen • Deutschland • Tel +49 241 9105010
Fax +49 241 91050138 • info@zander-aachen.de • www.zander-aachen.de
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Safety Time Control Device SCB
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