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Fairchild T79 Series Maintenance And Operating Instructions

Electro-pneumatic transducers
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FAIRCHILD MODEL T79xx SERIES
ELECTRO-PNEUMATIC TRANSDUCERS
(Analog Output)
Operation and Maintenance Instructions
Software Version 3.45 and 3.46
Figure 1. Model T7900 Keypad
SPECIFICATIONS
Figure 2. Model T7950 Keypad
Figure 3. Model T79xx Series Transducer Keypad Functions

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Summary of Contents for Fairchild T79 Series

  • Page 1 FAIRCHILD MODEL T79xx SERIES ELECTRO-PNEUMATIC TRANSDUCERS (Analog Output) Operation and Maintenance Instructions Software Version 3.45 and 3.46 Figure 1. Model T7900 Keypad SPECIFICATIONS Figure 2. Model T7950 Keypad Figure 3. Model T79xx Series Transducer Keypad Functions...

  • Page 2: General Information

    GENERAL INFORMATION The Model T79xx Series includes Model T7900 and disrupted, the unit returns to its last setting when Model T7950 Electro-Pneumatic I/P, E/P transduc- power is restored. ers Control Output Pressure in proportion to an analog input signal. These devices use feed and bleed solenoid valve control technology, digital feedback electronic con- When you apply initial power to the units, dis-...
  • Page 3 Table 1. Main Menu (shown in red) Description Range Item 0-30 psig, [0-2 BAR], (0-200 kPa) Output Pressure - Displays the actual output pressure. 0-75 psig, [0-5 BAR]. (0-500 kPa) 0-150 psig, [0-10 BAR], (0-1000 kPa) 0-30 psig, [0-2 BAR], (0-200 kPa) Setpoint - Sets/displays the required process variable.
  • Page 4 Figure 2. Model T7950 Menu System...

  • Page 5: Operating Modes

    OPERATING MODES Controlling Output Pressure with Analog Setpoint Control The Model T7900/T7950 is configurable for controlling Control Input set to Remote : The Model output pressure or a process variable. Use the T7900/T7950 control input channel is configured to Control Input and Analog Output connection accept an analog control signal to control the menu items to set these operating modes.
  • Page 6 MENU ITEM FUNCTIONS Control Input ( Control Input configures the control input chan- Output Pressure ( nel function. Setting in Remote mode, the Displays the actual output pressure in the default control input channel functions as setpoint control PSIG units. BAR and kPa units can be displayed based on configuring ( ) and ( ) as discussed...
  • Page 7 Pressure Unit Conversion ( ) and ( ) cont. Option Value ( ), ( ) (cont) The values of are integers only and are = mA, = 0.00, = 30.00, limited to the range of 1 to 9999. The Model T7900/ 4.00, and = 20.00;...

  • Page 8: Maintenance

    The information set forth in the foregoing Operation and Mainte- nance Instructions shall not be modified or amended in any respect without prior written consent of Fairchild Industrial Products Com- 5. To replace solenoid valves in the Model T7900, pany.

This manual is also suitable for:

T7900T7950