Accepting Alarm Conditions - General Monitors TA102A Instruction Manual

All of the relay contacts on the Model TA102A have a maximum rating of:
• 4A @ 30V RMS/42.4V Pk., 3A @ 30Vdc resistive
The following outputs have rear terminal open collectors:
• A1 Alarm & LED Mimic
• A2 Alarm & LED Mimic
• Fault
• UA - Unaccepted Alarm
• FUA - Unaccepted Fault
• CAL - Calibration & Calibration Check Modes. Also indicates Inhibit Mode.
All of the open collector outputs on the Model TA102A have a maximum rating of:
• 100mA @ 35Vdc
• The Analog Output Signal is used for sending gas concentrations and status
information to remote devices. The maximum analog load may not exceed 300 ohms
including the wire/cable that the signal is sent on.
The Analog Output is a 0 to 21.7mA current signal with 4 to 20mA being proportional to
0 to 100% of full scale.
When the Model TA102A is placed in the calibration, calibration check, setup, setup
check or inhibit mode a 1.5mA signal is generated by this output. During the calibration
mode the digital display will indicate prompts associated with the calibration procedure.
During the calibration or the calibration check mode, the digital display on the TA102A
will indicate CA if the CAL current is 1.5mA if the CAL current is 0mA the display on the
TA102A will indicate F4 (field device error).
When the Model TA102A enters into a fault condition a 0mA signal is generated by this
output. During a fault the display will indicate a fault code ("F" followed by a digit).
If the sensor attached to the Model TA102A is seeing gas in excess of 100% of full
scale, this output will generate a signal between 20 and 21.7mA (not proportional). An
over range condition is indicated by a flashing digital display reading full-scale (99).
Overrange conditions are latching.
4.4

Accepting Alarm Conditions

Whenever a new alarm condition occurs, the front panel LED and open collector
associated with that alarm (LA1 or LA2) would begin to flash. In addition, the associated
alarm outputs and the unaccept outputs (TA102A UA open collector & FM002A UA
relay) will activate, unless they are already activated. The flashing front panel alarm LED
and rear terminal open collector indicate that a new alarm has been activated. New
alarms should be acknowledged, or accepted. This is accomplished with the Master
Accept Button located on the Facilities Module, (FM002A).
Pressing the Master Accept Button de-activates the UA outputs and causes the
associated front-panel alarm LED, and rear terminal open collector to stop flashing and
energize.
NOTE - Alarms that latch must be Accepted before they can be Reset (see Section 5.5).
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Model TA102A