IDTECK iMDC-MAIN User Manual page 27

Multi doors access control system
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It is strongly recommended to add a reverse diode between the inductor coils to a
bsorb this surge voltage. If you do not connect a reverse diode, the surge voltage
will transfer and damage the electronic circuit of the controller. 1N4004 – 1N4007
or equality efficiency diode is included in gift box.
CHECK POINT DURING INSTALLATION
p.21

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