Reference Manual

4(6)
EN/LZT 720 0246 R1A
4 Interface
The FCU has the following interfaces:
• Power in
• EPC bus in
• EPC bus out
• Fan power and alarm (1 – 4)
 6LJQDODQG3RZHU,QWHUIDFH
The tables below show input and output data.
7DEOH ,QSXWGDWD
1RPLQDOLQSXWYROWDJH
+24.0 V DC
,QSXWYROWDJH5DQJH
+19.0 – +29.0 V DC
1RQGHVWUXFWLYHYROWDJH
0.9 – +32.0 V DC
,QSXWSRZHU
4 x 45 W
7DEOH 2XWSXWGDWD
2XWSXWYROWDJH
9 – 28.3 V DC
2XWSXW&XUUHQW
Min 1.8 A at 9 – 28.3 V DC
 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 1RDODUP
$ODUPSRV8
SRV
5 – 30 V DC
$ODUPQHJ8
QHJ
<U
pos
– 2.4 V DC
&XUUHQW,
QRBDODUP
5 – 20 mA