COBHAM D-MBR 3707 - Booster Dry-Contact Alarm Connections

D-MBR 3707-3708 PS NFPA CLASS A SIGNAL BOOSTER
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless – Coverage
Date: 17-Jan-16
www.cobham.com/wireless
Doc. No.00060CDUM Rev. 1.1 Page | 25
3.4.3 Booster Dry-Contact Alarm Connections
This section describes the dry-contact alarm connections for the booster .
The D-MBR and its power source (UPS or Battery Charger), each provide dry-contact alarms towards
the Fire Department Control Box. (In installations with UPS, refer to your UPS manual for instructions
on dry-contact alarm connections to the Fire Department Control box).
Note the following:
• The alarms can be connected any time, before or after the system is powered-on.
• The Charger alarm connections are described in section
4.4.5.
WARNING! The charger should be turned OFF prior to battery connection
Figure 3-17. D-MBR PS NFPA with Charger Architecture
3.4.3.1 Alarm Dry Contact Output Restrictions
• Maximum switching voltage: 220 VDC, 125 VAC
• Maximum switching current: 2A
3.4.3.2 External Alarm Input Restrictions
• Maximum repetitive reverse voltage: 28 V
• Impedance load: 470 Ohm
“0” - 0V
“1” - 3.8V - 28V