13
Model TA502A
3.0 Operation
This chapter discusses what general maintenance to perform. It also describes the
electrical inputs, outputs, accepting and resetting of alarms, calibration, fault
conditions, and fault diagnostics.
3.1 General Maintenance
Once the Model TA502A has been installed, very little maintenance is required other
than periodic checks to verify the integrity of the system.
•
A functional test of the system should be performed at least once each year.
This test should include full operation of stand-by systems or back up power
for the prescribed period.
•
The power, field device, and output wiring should be checked for tightness,
verifying that all of the components and devices are connected correctly.
Verify that the fuses (F1, F2, & F3) are operational.
•
If the “
Password
” is disabled, periodic checks of the setup parameters
should be performed.
3.2 Electrical Inputs
There are two electrical inputs to the Model TA502A. They are the Field Device and
the Card Test input. Both of these input connections (field device and card test) are
made to the rear terminal block (see Section 2.0 for more detailed installation
information).
•
The Field Transmitter input consists of a standard three lead connection,
such as, (Black = Common, White = Signal, Red = +24 VDC). See Figure 19.
•
The Card Test input consists of a single termination for remote testing of the
Model TA502A’s functions. For detailed information on the Card Test, refer to
Figure 21.
3.3 Electrical Outputs
The electrical outputs on the Model TA502A consist of relay contacts, open
collectors, and an analog current signal.
The following outputs have rear terminal relay contacts:
•
A1 Alarm - DPDT relay contacts
•
A2 Alarm - DPDT relay contacts
•
Fault - SPDT relay contacts
