Model 4802A
5
For the rear terminal designations refer to Figure 21 below:
Figure 21 – Rear Terminal Designations
3.3.1 A2 Alarm
The terminal designations for the
A2
alarm outputs are:
Figure 22 – Terminal Designations for A2 Alarm Outputs
The
A2
alarm outputs are DPDT relays, 1 open collector output (
A2-OC
) that follows the
logic of the relays and 1 open collector output (
LA2
) that follows the blinking pattern of
the front panel LED. The A2-C1 designation is common for A2-1 & A2-2. The A2-C2
designation is common for A2-3 & A2-4. The normally open (
NO
) and normally closed
(
NC
) contacts depend on a user selectable option (see Chapter 5). The table below
refers to the proper open and closed
A2
alarm relay contacts while the unit is on power:
User Selected
Relay State
Normally
Open
Normally
Closed
Normally
Energized
A2-C1 & A2-1,
A2-C2 & A2-4
A2-C1 & A2-2,
A2-C2 & A2-3
Normally
De-Energized
A2-C1 & A2-2,
A2-C2 & A2-3
A2-C1 & A2-1,
A2-C2 & A2-4
Figure 23 – A2 Alarm Relay Contacts
LABEL
TERM
DESCRIPTION
A2-C1
2d
Relay Common (1 & 2)
A2-1
4d
Relay Contact
A2-2 6d
Relay
Contact
A2-3
8d
Relay Contact
A2-4 10d
Relay
Contact
A2-C2
12d
Relay Common (3 & 4)
A2-OC 14d
Open
Collector
(OC)
LA2
24z
OC Logic for A2 LED (mimic)
