Ericsson RBS 2106 Hardware Reference Manual page 348

4(6)
4 Interface
The FCU has the following interfaces:
•
•
•
•
 6LJQDO DQG 3RZHU ,QWHUIDFH
The tables below show input and output data.
7DEOH 
1RPLQDO LQSXW YROWDJH
,QSXW YROWDJH 5DQJH
1RQ GHVWUXFWLYH YROWDJH
,QSXW SRZHU
7DEOH 
2XWSXW YROWDJH
2XWSXW &XUUHQW
 2SHUDWRU ,QWHUIDFH
There is one alarm signal for each fan. The alarm circuit is normally closed.
An open circuit indicates that the fan speed is too low. The fan has an open
collector interface.
7DEOH 
$ODUP SRV 8
$ODUP QHJ 8
&XUUHQW ,
EN/LZT 720 0246 R1A
Power in
EPC bus in
EPC bus out
Fan power and alarm (1 – 4)
,QSXW GDWD
2XWSXW GDWD
1R DODUP
SRV
QHJ
QRBDODUP
+24.0 V DC
+19.0 – +29.0 V DC
0.9 – +32.0 V DC
4 x 45 W
9 – 28.3 V DC
Min 1.8 A at 9 – 28.3 V DC
5 – 30 V DC
<U – 2.4 V DC
pos
5 – 20 mA