Emc - Sentex EM3000 Installation Instructions Manual

8
Step 3: Access Control Overview
SYSTEM SETUP REQUIREMENTS
In every case, an access control system will require the set up and placement of the following:
EMC with its 12VDC Power Supply Board connected to a 110VAC junction box
Personal Computer that monitors the access control system
At the access control point, a Reader that determines access and a functional Electronic
Door Lock (with its own dedicated power supply) that allows access through the access point
Note: If your site must be fully functional during a power failure, door locks must have their
own battery back-up.

EMC

The proper placement of the EMC is the most
important decision in planning your installation.
Find a location that is dry, safe from large
temperature variations, and most importantly,
secure from the unexpected (e.g., vandalism).
The recommended installation locations are:
1. Telephone/ PBX rooms
2. Computer rooms
3. A wall near one of the Readers (protected
area)
4. Above a false ceiling
The EMC is rated for indoor installation only.
To keep your EMC working properly, place where:
the temperature range is between 45-135 F (non-condensing).
maximum distance from reader(s) to EMC is 500 feet.
maximum cable distance from the PC (at the RS-485 converter) to the last EMC (if you are
using more than one) is 4,000 ft. If your installation absolutely requires a longer distance, use
an RS-485 repeater (such as B&B Electronics-485OP) to amplify the signal. Refer to the
repeater's installation instructions for more information.
You should select an area that is the most convenient for cabling and future maintenance.
Doc 6001536, Rev C
Figure 3: EMC