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)
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