9
Model TA502A
The Fault outputs are SPDT (Single Pole Double Throw) relay contacts, one open
collector output (F-OC) that follows the logic of the relays and one open collector output
(FUA-OC) dedicated to new fault indications. With the Backwards Compatibility option,
the FUA-OC will not be present (pin 32d will be for +24VDC). The Fault outputs are
always normally energized when power is applied to the module.
The contact ratings for the
A2
&
A1
alarm and
Fault
relays are 4A @ 250 VAC, 3A @ 30
VDC, Resistive, maximum.
2.3.1.1 Field
Connections
Inductive loads (bells, buzzers, relays, etc.) on dry relay contacts must be clamped down.
Unclamped inductive loads can generate voltage spikes in excess of 100 volts. Spikes of
this magnitude may cause false alarms and contact damage. Figure 14 shows
recommended relay protection circuits for AC and DC loads, respectively.
Figure 14: Relay Protection for AC and DC Loads
The terminal designation for the
Un-accept
output is:
Label
Term
Description
UA 8d
Open
Collector
Output
Table 6: Un-accept output
The terminal designation for the Discrete
Calibration
Output is:
Label
Term
Description
CAL-OC 32z
Open
Collector
Output
Table 7: Calibration Output
If the Backwards Compatible configuration is ordered, the CAL-OC will not be present
(pin 32z will be for the COM).
The terminal designations for the
Field Transmitter connections
are:
Term
Description
26 d, z
Signal IN (Analog Signal)
30 d
Signal IN Common *
28 d, z
VDC Out (+24Vdc)
30 z
DC Common
Table 8: Field Transmitter Connections
