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1.13
COMPUTER CONTROL --- ELECTRONICS CENTER
1.13.1 Brief Description
For
manual
microprocessor, refer to Table 4-7.
When doing any arc welding on the unit or
container, disconnect all connectors from
controller and remove ground lead going to I/O
board to prevent any damage due to electrostatic
discharge.
The Carrier Transicold Computer Control ---
Electronics Center (CC-EC) is a custom-designed
computer which incorporates electronic intelligence to:
a. Control temperature of supply or return air to ex-
tremely tight limits by providing modulation refrigera-
tion control and electric heat control and defrost to en-
sure continuous conditioned air delivery to the load.
b. Provide dual independent readouts of set point and
supply or return air temperatures and, in addition, the
following data:
---
Ambient Air Temperature
---
DataCORDER Probe Temperatures (Optional)
---
Refrigeration Valve Positions (open, close or % open)
---
Power Supply Voltage, Frequency and Line Currents
---
Refrigerant Suction, Discharge, Condenser Temper-
atures
---
Refrigerant Discharge Pressure
---
Compressor Running Hours
---
Time Remaining Until Defrost
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Enter
Figure 1-7. Microprocessor Control Panel
NOTE
override
operation
CAUTION
search engine
c.
Provide digital readout and ability to select the fol-
lowing data:
of
the
---
Defrost Interval
---
_C or _F
---
In-Range Tolerance
---
Time Delay Start Interval --- Start of Unit
---
Current Limiting
d. Signal malfunction alarm light and/or digital display
identification of the following:
---
Internal or Fuse Protection of Control Circuit,
Transformer, Compressor, Evaporator and Condenser
Motor
---
High Pressure Cut-Out
---
Individual Sensor Failure
---
High Temperature Thermostat
---
Failure of Heaters, Defrost Termination Thermo-
stat, and Compressor
---
Self-Diagnostic Conditions of Computer Functions
e. Provide a detailed automatic pre-trip step-by-step
checkout of refrigeration unit performance, proper com-
ponent operation, proper electronic and refrigeration
control operation, proper heater operation, checking
probe calibration and current limiting.
f.
Provide storage of detailed temperature information
on set point and return and supply air, record of power
outage, defrost initiation, set point changes, alarm occur-
rences and date of trip start.
1-13
Return
°C
Supply
°F
Hours
Since Last
Trip Start
Trip Start
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