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8
2.
Important installation instructions
2.1
Protective measures during installation
Attention:
Switch the mains supply off before opening the device.
The VDE regulations and the regulations of the electricity supplier must be observed during installation. Carry out
the connections between the control unit and the external devices according to the connection diagrams.
A separator (circuit breaker) must be integrated in the installation of the building.
Use only shielded cable (see chapter "Cable lengths/types").
The max. cable length between the control unit and the card reader, keypad or door strike must not exceed 20m
up to 200m (according to the used reader!). All cable shields in the control unit must be connected to the central
ground terminal. The ground terminal must be connected to a ground potential.
When using a d.c. door strike, special attention is to be paid to correct polarity. Use only d.c. door strikes equiped
with a protective diode.
2.2
Grounding/shielding
Use shielded cable and a suitable shielding connection for protection against electromagnetic interference
couplings occurring, for example, when switching electric appliances on and off.
Make sure that the cable shields in the distribution boxes are connected so that there are no links to other
potentials. In the door module, all shields should be connected to one point using the shortest possible route.
The shield soldering bar serves as support for the connection of the ground conductors and line shields.
(See below).
The following shielding connection is possible:
Connect the shield soldering bar to the ground conductor
The door module represents a capacitive coupling between the ground conductor and the system operating
voltage. This connection generally offers the best protection against conducted interferences and interferences
caused by cable shield discharges. PE and N must be connected separately (modern grounding) and it must be
guaranteed that the ground conductor does not carry any low- or high-frequency signals.
Observe:
VDE 0800 Part 2 July edition 1980.
VDE 0800 Part 2 AI Draft, November 1982.
Mounting and Connection Instructions - Door module RS485
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