Carrier 69NT40-541-505, Руководство по эксплуатации и обслуживанию, Страница: 33 / 143

4–3 T-368
Figure 4.3 Display Module
4.1.3 Controller
CAUTION
!
Do not remove wire harnesses from con-
troller unless you are grounded to the
unit frame with a static safe wrist strap.
CAUTION
!
Unplug all controller wire harness con-
nectors before performing arc welding on
any part of the container.
CAUTION
!
Do not attempt to use an ML2i PC card in
an ML3 equipped unit. The PC cards are
physically different and will result in
damage to the controller.
NOTE
Do not attempt to service the controller.
Breaking the seal will void the warranty.
The Micro-Link 3 controller is a single module micro-
processor as shown in Figure 4.4 . It is fitted with test
points, harness connectors and a software card pro-
gramming port.
4.2 CONTROLLER SOFTWARE
The controller software is a custom designed program
that is subdivided into the configuration software and
the operational software. The controller software per-
forms the following functions:
a. Control supply or return air temperature to
required limits, provide modulated refrigeration
operation, economized operation, unloaded oper-
ation, electric heat control, and defrost. Defrost is
performed to clear buildup of frost and ice to
ensure proper air flow across the evaporator coil.
b. Provide default independent readouts of set
point and supply or return air temperatures.
c. Provide ability to read, and if applicable, modify the
configuration software variables, operating soft-
ware function codes, and alarm code indications.
d. Provide a Pre-trip step-by-step checkout of refrig-
eration unit performance, including proper compo-
nent operation, electronic and refrigeration control
operation, heater operation, probe calibration,
pressure limiting, and current limiting settings.
e. Provide battery-powered ability to access or
change selected codes and set points without
AC power connected.
f. Provide the ability to reprogram the software
through the use of a memory card.
4.2.1 Configuration Software (CnF Variables)
The configuration software is a variable listing of the
components available for use by the operational soft-
ware. This software is factory-installed in accordance
with the equipment fitted and options listed on the origi-
nal purchase order. Changes to the configuration soft-
ware are required only when a new controller has been
installed or a physical change has been made to the unit
such as the addition or removal of an option. A configu-
ration variable list is provided in Table 4–4 . Change to
the factory − installed configuration software is achieved
via a configuration card or by communications.
Figure 4.4 Control Module
1. Mounting Screw
2. Micro-Link 3 Controller
3. Connectors
4. Test Points 5. Fuses
6. Control Circuit Power Connection (located on back
of controller)
7. Software Programming Port
8. Battery Pack
- - - - -
COOL HEAT DEFROST IN RANGE ALARM SUPPLY RETURN
SETPOINT/Code AIR TEMPERATURE/Data
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
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