Cabinet Type
Number of Dry Contact
Alarm Inputs
Monitoring Board
1 to 16
UPEU+UEIU+EMU
17 to 32
NOTE
l
If backup power is required for the BBU, two UPEUs rather than UPEU+UEIU are configured.
l
If three BTS3900 cabinets are configured, only one UEIU is required to monitor both RS485 and dry
contact alarms.
l
Analog values can be monitored only by the EMU.
l
The EMU with sensors can be configured according to site requirements.
Customized Alarms Collected by the UPEU or UEIU
Each UPEU or UEIU in the BBU supports eight Boolean alarm inputs. A maximum of two
UPEUs or UPEU+UEIU can be configured for the BBU to receive 16 Boolean alarm inputs.
This method can be used for the configuration of fewer than 16 customized alarm inputs. The
method to collect customized alarms by using the UPEU or UEIU is shown in
.
Figure 3-37
Customized alarms collected by the UPEU or UEIU
Customized Alarms Collected by the EMU
If there are more than 16 Boolean alarm inputs, the EMU can be configured for the BTS3900.
Each EMU supports 32 Boolean alarm inputs and two RS485 signal inputs, the cable connections
are shown in
.
l
The cable connection of the EMU in the BTS3900 cabinet (-48 V DC) and BTS3900 cabinet
(+24 V DC): The EMU is connected to the MON1 port on the UPEU in the BBU.
3 BTS3900 Hardware Configuration
BTS3900
Hardware Description
3-40
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Issue 04 (2011-02-15)