Carrier 69NT40-561-300, Operation And Service Manual

Page: 38 / 174

T-365 4–4
The Micro-Link 3 controller is a dual module microprocessor as shown in Figure 4.4 . It is fitted with test points, har-
ness connectors and a software card programming port.
Figure 4.4 Control Module
1. Mounting Screw
2. Micro-Link 3 Control/DataCORDER Module
3. Connectors
4. Test Points 5. Fuses
6. Control Circuit Power Connection
7. Software Programming Port
8. Battery Pack (Standard Location)
- - - - -
4.2 CONTROLLER SOFTWARE
The controller software is a custom designed program that is subdivided into configuration software and opera-
tional software. The controller software performs the following functions:
• Control supply or return air temperature to required limits, provide modulated refrigeration operation, econo-
mized operation, unloaded operation, electric heat control and defrost. Defrost is performed to clear buildup
of frost and ice in order to ensure proper air flow across the evaporator coil.
• Provide default independent readouts of set point and supply or return air temperatures.
• Provide ability to read and (if applicable) modify the configuration software variables, operating software
Function Codes and Alarm Code indications.
• Provide a Pre-trip step-by-step checkout of refrigeration unit performance including: proper component oper-
ation, electronic and refrigeration control operation, heater operation, probe calibration, pressure limiting and
current limiting settings.
• Provide battery-powered ability to access or change selected codes and set point without AC power con-
nected.
• Provide the ability to reprogram the software through the use of a memory card.
4.2.1 Configuration Software (CnF Variables)
Configuration software is a variable listing of the components available for use by the operational software. This
software is factory installed in accordance with the equipment fitted and options listed on the original purchase
order. Changes to the configuration software are required only when a new controller has been installed or a phys-
ical change has been made to the unit such as the addition or removal of an option. A configuration variable list is
provided in
Table 4–2 . Change to the factory-installed configuration software is achieved via a configuration card
or by communications.
4.2.2 Operational Software (Cd Function Codes)
The operational software is the actual operation programming of the controller which activates or deactivates com-
ponents in accordance with current unit operating conditions and operator selected modes of operation.
The programming is divided into function codes. Some of the codes are read only while the remaining codes may
be user configured. The value of the user configurable codes can be assigned in accordance with user desired
mode of operation. A list of the function codes is provided in
Table 4–3 .
MA
CONTROLLER
Micro-Link3
With
DataCORDER
MB
MC
F2
(5A)
TP
F1
(5A)
F3A
(7.5A)
F3B
(7.5A)
KH
OC1
KA
EN12830
CARRIER
S/N: 0491162
T B C1
KE
REV 5147 YYWW:
KD
1035
KC
12-00579-00
59980
KB
1 2 3 3 4 5 3 6 7 3 8 3