ANALOG INPUTS – Pressure
Refer to the unit wiring diagram. Pressure inputs are connected to the microboard on plugs J4 and J7. These analog inputs represent varying dc signals correspond- ing to varying pressures. All voltages are in reference to the unit case (ground).
System 1 discharge and suction pressures will be con- nected to J4 of the microboard. System 2 discharge and suction pressure transducers will be connected to J7 of the microboard.
The discharge transducers are optional on all units. If the discharge transducers are not installed, no connec- tions are made to the microboard and the discharge pressure readout on the display would be zero.
The suction pressure transducers are optional on YCAL0014 - YCAL0060. If the suction transducers are not installed, a mechanical low pressure switch will be installed in its place, and the suction pressure readout on the display will be 0 PSIG when the LP switch is open, and 200 PSIG (13.79 BARG) when the LP switch is closed.
The discharge transducers have a range from 0 to 400 PSIG. The output will be linear from .5VDC to 4.5VDC over the 400 PSIG (27.5 BARG) range. Following is the formula that can be used to verify the voltage output of the transducer. All voltage reading are in reference to ground (unit case).
FORM
V = (Pressure in PSIG x .01) + .5
or
V = (Pressure in BARG x .145) + .5
where V = dc voltage output
Pressure = pressure sensed by transducer
The microboard connections for the Discharge Trans- ducers:
System 1 Discharge Transducer |
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| formula above for voltage readings that |
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| correspond to specific discharge pressures. |
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+5VDC return |
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System 2 Discharge Transducer |
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| formula above for voltage readings that |
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| correspond to specific discharge pressures. |
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+5VDC return |
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3 | |||
drain (shield connection = 0VDC) | |||
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YORK INTERNATIONAL | 101 |
