7300A user Manual
2-13
Installation
Figure 2-15 Typical external alarm acknowledgement contact connections
2.5.6. Acknowledgement signal (
ICO
option)
With the ICO option, the alarms listed below may be acknowledged with a +5 V signal
applied to an ACK logic input (terminal 62) available on the ‘DIG.IN’ terminal block.
• Over-load
• Partial Load Failure
• Total Load Failure
Alarms can be acknowledged in 2 ways:
• by connecting a contact between terminal 63, labelled 5VD (+5 V user output)
and the ACK input (see figure 2-15a)
• by applying an external 5 V source between terminals 0VD and ACK
(see figure 2-15b).
Note: The DLF alarm can also be reset with the ‘CHK/SET’ push button.
Alarm
Acknowledgement
connector
ALR
71 1
a
72
1
b
DIG.IN 61 0
V
D
62 ACK 63 5
V
D
ANA
31
0
V
A
32
R
I
33 5
V
A
HEAT
a) Acknoledgement by
contact or push button
0 V + 5 V
External source
ALR
71 1
a
72
1
b
DIG.IN 61 0
V
D
62 ACK 63 5
V
D
ANA
31
0
V
A
32
R
I
33 5
V
A
HEAT
b) User External Source for the
alarm acknowledgement
+ 5 V
ACK
ACK
