Microprocessor; Controlled Atmosphere Controller Module; Brief Description; Figure 63. Controlled Atmosphere Controller Module - Carrier 69NT40-489-100 Series Operation And Service Manual

9.1 CONTROLLED ATMOSPHERE CONTROLLER MODULE

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1. Mounting Screw
2. CA Controller Module
3. Connectors
4. Test Points

9.1.1 Brief Description

Do not attempt to service the CA Controller
module. Breaking the warranty seal will
void the warranty.
Remove all Controller modules and unplug
all wire harness connectors before per-
forming any arc welding on any part of the
container.
Do not remove wire harnesses from mod-
ules unless you are grounded to the unit
frame with a static safe wrist strap.
The Carrier Transicold CA module (identical to the ML2i
Temperature Controller used in the refrigeration system
with the exception of the software) is a custom-designed
microprocessor which incorporates electronic logic to:

MICROPROCESSOR

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Figure 63. Controlled Atmosphere Controller Module

WARNING
CAUTION
SECTION 9
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5. Fuses
6. Control Circuit Power Connection
(Location: In back of connector)
7. Software Programming Port
a. Wait for proper refrigeration system conditions before
enabling start-up of the CA.
b. Control oxygen and carbon dioxide levels within a re-
frigeration container, and monitor the percentage lev-
el of nitrogen being generated.
c. Control The addition of carbon dioxide from an inde-
pendent source.
d. Provide dual independent readouts of set points and
concentration levels for oxygen and carbon dioxide.
e. Provide digital readout and ability to select data. Re-
fer to Table 22, page 102 for CA Controller Function
Codes. For CA Controller alarm digital display identi-
fication refer to Table 24, page 105.
f. Provide a pre-trip step-by-step checkout of CA sys-
tem performance, proper component operation,
proper electronic control operation, proper heater op-
eration and automatic sensor calibration.
g. Provide the ability to select function codes and
change selectable function codes, configuration vari-
ables and set points. Refer to section 9.1.4, page 102.
h. Provide memory reprogramability and configuration
through a memory card. The memory card automati-
cally downloads new software to the CA Controller
when inserted, and controls output to the display of
programming status information. (See section
12.14.1, page 133)
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T-305