Cornelius I Series Manual de servicio descargar pdf (Pagina 44)

41 TD 204

Sensor [Thermistor] Diagnosis

Sensors

Condenser or suction line – Turn Cuber power switch OFF. Discon-

nect sensor plug from board. Use digital multimeter set for D.C.

Voltage. Turn power switch ON connect leads of meter across the

two pins of the sensor being checked, meter should read 2.5

VDC0.2 output voltage from the board. If voltage is not correct,

replace the circuit board.

Should the cuber operation indicate there may be a fault

in the sensor [thermistor] or the control board circuit pro-

ceed as follows.

1. Using a good multimeter check the control board sen-

sor output voltage.

2. Voltage checks are correct proceed:

a. Disconnect the suction line sensor (brown lead)

from the control board.

b. Install the special test cord* to the control board

and reinstall the sensor to the test cord termi-

nals.

c. Connect the multi-meter (set on VDC - milli-

volts) to the test cord leads.

d. Operate the cuber in the freeze cycle.

3. As the suction line temperature decreases the Milli-

volt reading will increase.

4. Sensor Shorted - milli-volt reading will cease to in-

crease and will remain steady indicating a shorted sen-

sor.

5. Sensor Open - The voltage reading will indicate the

control board output voltage of 2.5 VDC.

6. Should either “4.” or “5.” happen during this test, the

sensor will require replacement.

* Special test cord, part # 164984009, may be ordered

through the Service Department.

7. Condenser Sensor (white leads) - self-contained air

cooled only - water cooled and remote systems use a

resistor plug on the control board.

Complete the sensor and multi-meter connections as

described in

2- b.,c.,d..

8. Shorted sensor - a steady low milli-volt reading will

be recorded. The reading will not change.

9. Open sensor - the multi-meter will record control

board output voltage of 2.5 VDC.

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Cornelius I Series Manual de servicio Pagina 44

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