Installation
4-182 Service Manual
Recommendations concerning the Power Supply and Protection of the System
Entrance telephone mode
4.14 Recommendations concerning the Power Supply and Protection
of the System
Instructions for solving possible ground return problems
Step Procedure
1. Set jumper 1 (J1) to OFF (see “Internal entrance telephone with TFE interface” on
page 3-103).
2. Configure the system for entrance telephone mode and specify the extensions for
answering calls. Specify also at which extension the interface will be installed.
3. Connect the interface to the entrance telephone extension by using contacts 1 and
2 on the X2 Connector.
4. Connect the entrance telephone to contacts 3 and 4 on the X6 Connector, wiring it
as instructed by the manufacturer.
5. When the person at the door presses the entrance telephone button, it causes it to
ring at extensions configured for answering calls.
When an extension answers the call, the voice capability is automatically enabled.
6. Dial the code for the door opener.
7. To disable voice capability the attendant extension must dial “9”.
To enable voice again the attendant extension must dial “5”.
If the sound is not disable manually, it will automatically timeout after 5 minutes.
8. “Performing a visual inspection” on page 4-189.
9. Configure the required data (see “Operation” on page 7-278).
To avoid ground return signals from remote systems use the same phase for the dif-
ferent systems’ power supply.
If the characteristics of the building make this impossible, use an intermediate trans-
former to detach the external system so that damage may be avoided during oper-
ation.
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