8
Model TA502A
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
Table 2: A2 Alarm Relay Contacts
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
Table 3: A1 Alarm
The
A1
Alarm outputs are DPDT relay contacts, one open collector output (A1-OC) that
follows the logic of the relays and one 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 Section 4.0).
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-C1 & A1-3
Normally De-
Energized
A1-C1 & A1-2,
A1-C2 & A1-3
A1-C1 & A1-1,
A1-C2 & A1-4
Table 4: A1 Alarm Relay Contacts
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-OC 32d Open
Collector
(OC)
Table 5: Fault Alarm