Service manual

Alarm sequence 2
B-7
B
LEDs and relays,
1alarm
The following table shows the state of the front LEDs and alarm relays for one alarm
in different alarm situations. For further information on the definition of active and
inactive relays, see Connecting to an external alarm system,p.27.
LEDs and relays,
2alarms
The following table shows the state of the front LEDs and alarm relays for two
alarms in different alarm states:
Comments The Z
A
and Z
B
relays in sequence 2 signal the presence of an A or B alarm respec-
tively. Unlike the LEDs and the A and B relays, these relays are not influenced by the
Receiving Attention button.
Condition Front LEDs Alarm relays
A or B Rec.
Att.
A or B Rec. Att. Z
A
or Z
B
1Nofault
❍❍ ❍ ❍ ❍
2 Fault X occurs
●❍ ● ❍ ●
3 You press the Receiving Attention button
❍● ❍ ● ●
4 Fault X clears
❍❍ ❍ ❍ ❍
5 Fault X clears after 2
❍❍ ❍ ❍ ❍
●
= active relay, LED lit,
❍
= inactive relay, LED not lit
Condition Front LEDs Alarm relays
A B Rec. Att A B Za Rec. Att Zb
1Nofault
❍❍❍ ❍❍❍ ❍ ❍
2 First fault. Digital audio input loss
(B-alarm)
❍● ❍ ❍ ● ❍ ❍ ●
3 You press the Receiving Attention
button after 2
❍❍● ❍❍❍ ● ●
4 Fault clears after 3
❍❍❍ ❍❍❍ ❍ ❍
5 Second fault. Network input loss
(A-alarm) after 3
●❍●●❍●●●
6 You press the Receiving Attention
button after 5
❍❍●❍❍●●●
7 First fault clears after 6
❍❍●❍❍●●❍
8 First fault clears after 5
●❍ ❍ ● ❍ ● ❍ ❍
●
= active relay, LED lit,
❍
= inactive relay, LED not lit