Ingersoll-Rand Intellisys SSR 10-40, Руководство для обслуживающего персонала

Страница: 82 / 107

-77-
-78-
Carefully record the thermometer and ohmmeter readings and compare them
with the charts (pages 81, 82) in the following sequence.
First...locate the temperature on the chart that corresponds with the temperature
measured with the test thermometer in the heated liquid.
Second...observe the resistance value shown on the chart next to the correct
temperature. This resistance value must be within a tolerance of plus/minus 2
percent of your test ohmmeter reading.
The sensor will be either good or bad. Replace if required.
To replace, install a new O-Ring over the sensor body using care to prevent
damage from the threads of the fitting. It would also be advisable to make an
inspection of the wire connections within each half of the snap-type connector
at this time.
To make the check, loosen the small plastic nut (use a 1/2 inch open-end
wrench) where the wire enters the connector half. Next, remove the small screw
in the side of the connector half and gently slide the inner portion of the connector
out of its housing. Use a screwdriver to check the integrity of the three small
terminals that hold the wire ends. If the wires are tight, re-assemble the
connector half and install the small screw in the side of the housing that holds
the assembly together. Gently tighten the small nut only enough to compress
the rubber grommet around the wire that prevents dirt or liquid from entering the
connector.
Put a drop or two of Coolant on the sensor threads and O-Ring prior to installing
the sensor back into position. Gently tighten the sensor and install the self
indexing wire connector. Confirm the small gasket is between the two halves of
the connector.
Carefully inspect your work at this point to determine no damage to the wiring
has occurred during installation of the sensor.
Troubleshooting
The Intellisys panel has the logic to determine that a "Sensor Failure" has
occurred and will indicate the probable area to check with a message on the
display.
As an example, if the compressor has shut down on an Alarm condition and
Sensor Failure 4APT is on the display, the problem can be located within the
circuitry for that particular sensor.
There can be various types of "Failures" associated with the temperature
sensors and are easier to understand if the failures are placed in different
categories.
A) Open circuit such as a broken wire, disconnected cable junction halves,
loose wire, etc. on either the Black or White wire.
This type of problem causes the compressor to shutdown with an Alarm
Condition displayed on the panel if the open wire is on either the Airend
Discharge Temperature Sensor (2ATT) or Injected Coolant Temperature Sen-
sor (2CTT). The open circuit reacts the same regardless of which wire (Black
or White) is cut.