Model 4802A
6
3.3.2 A1 Alarm
The terminal designations for the A1 Alarm outputs are:
Label Term Description
A1-C1 2z Relay Common (1 & 2)
A1-1 4z Relay Contact
A1-2 6z Relay Contact
A1-3 8z Relay Contact
A1-4 10z Relay Contact
A1-C2 12z Relay Common (3 & 4)
A1-OC 14z Open Collector (OC)
LA1 24d OC Logic for A1 LED (mimic)
Figure 24 – Terminal Designations for A1 Alarm Outputs
The A1 Alarm outputs are DPDT relays, 1 open collector output (A1-OC) that follows the
logic of the relays and 1 open collector output (LA1) that follows the blinking pattern of
the front panel LED. The A1-C1 designation is common for A1-1 & A1-2. The A1-C2
designation is common for A1-3 & A1-4. 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 A1 alarm relay contacts while the
unit is on power:
User Selected
Relay State
Normally
Open
Normally
Closed
Normally
Energized
A1-C1 & A1-1,
A1-C2 & A1-4
A1-C1 & A1-2,
A1-C2 & A1-3
Normally
De-Energized
A1-C1 & A1-2,
A1-C2 & A1-3
A1-C1 & A1-1,
A1-C2 & A1-4
Figure 25 – A1 Alarm Relay Contacts
3.3.3 Fault Alarm
The terminal designations for the Fault outputs are:
Label Term Description
F-C 16z Relay Common
F-1 18z Relay Contact (NO)
F-2 20z Relay Contact (NC)
F-OC 22z Open Collector (OC)
FUA 32d Open Collector (OC)
Figure 26 – Terminal Designations for Fault Outputs
The Fault outputs are SPDT relays, 1 open collector output (F-OC) that follows the logic
of the relays and 1 open collector output (FUA) dedicated to new fault indications.
NOTE - If the Backward Compatible configuration is ordered, the FUA will not be
present (pin 32d will be for +B).
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