BioSmart Prox-E, Руководство по установке

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13 Prox-E Installation Guide v1.2|10.2018|en
Fail-safe lock connection (without external power supply)

See recommended cable type in Cable types table;

Install a diode as it shown on figure, to protect controller relay from reverse current. Use
1N4007 diode (1000V,1A) or similar;
Caution
Make sure K4 jumper is on
Fail-secure lock connection (with external power supply)