Barco STELLAR User And Service Manual page 170

B
N
Alarm sequence 2
Alarm states in
sequence 2
Behavior
Alarm sequence 2
characteristics
Reference
B-6
Alarm sequence 2
The following figure shows the various states in alarm sequence 2:
Alarm active
0
No Alarm
Alarm inactive
Alarm inactive
The following table shows the behavior of LEDs and relays in alarm sequence 1:
LED or relay
Alarm LEDS
Alarm relays
Receiving Attention relay
Z or Z
A B
The following table shows the characteristics of alarm sequence 2:
Alarm sequence 2 characteristics
Relays indicate unserviced alarms
Relays indicate all alarms
One relay indicates alarms with attention
One relay indicates cleared alarms with attention
Tight control over alarms with attention
Clear relay indication of alarms with or without attention
Relays are used to switch to backup systems during alarm
conditions
Alarm sequence 2 complies with Bw 7R (FTZ 15281 Pfl 1) specified by Deutsche
Telekom.
Alarm Sequence 2
Active alarms require attention.
1
Alarm
without Attn.
Alarm LED A
Alarm LED B
Rec. Attn. LED
A relay
B relay
R e c e i v e
Rec. Attn. Relay
Attention
ZA relay
ZB relay
2
Alarm
with Attn.
Indication
Active alarms without attention.
Active alarms without attention.
Active alarms with attention
Active or inactive alarms
= A alarm(s) in state 1
= B alarm(s) in state 1
= alarm(s) in state 2
= A alarm(s) in state 1
= B alarm(s) in state 1
= alarm(s) in state 2
= A alarm(s) in state 1 or 2
= B alarm(s) in state 1 or 2
Yes
Yes
Yes
No
No
Yes
Yes