Furuno FAR-2107 Series Service Manual page 325

4.11.2 Setting of Alarm Output
This is the setting for outputting alarm detected by the processor unit (RPU-013). There are
four talarm ports. Respective alarm output items are set in [MENU] -> 3-> 6, 7, 8, 9:
ALARM OUT-1, 2, 3, 4.
Operations of the EXT ALARM terminals on the TB board are as follows.
- ALM-1, 2, 3: Normally Close. (During Power Off and Initializing - Close)
- ALM-4 : Normally Open. (During Power Off and Initializing - Open)
There is ALARM OUTPUT POLARITY in each setting item of Alarm OUTPU 1 to 4, and
then they can reverse the polarity of the alarm output.
SPU p.c.b
U31
I/F
U22
I/F
Driver is U10-12: PS7241 1B
Driver is U9: TLP176G TP
EXT ALARM ACK N
4
Normal close 1
3
Q4
2
U12
(PS7241 1B)
Same as
above
(U11/Q3)
Same as
above
(U10/Q2)
Normal open 1 4
Q1
2
3
U9
(TLP176G TP)
J612
EXT ALARM
Fig. 4.11.6 ALARM Output Circuit
RPU-013
ALARM OUT x-0
4
1
ALARM OUT x-1
3
Q4
2
U12
(PS7241 1B)
Fig. 4.11.7 Connection of ALARM Output
Terminal p.c.b
ALARM1-0
ALARM1-1
ALARM2-0
ALARM2-1
ALARM3-0
ALARM3-1
ALARM4-0
ALARM4-1
8 7 6 5 4 3 2 1
ALARM SYSTEM
ALARM SYSTEM
400V max.
100mA max.
1
2
4-61
4.11 Alarm Output Setting
RPU-013
KEY
J602
SYS FAIL H
9
SYS FAIL C
10
J622
SYS ACK H
1
GND
2
KEY
9 12 11