3-3
T -309
8
12
33 3 3 345 67
1
3
3
3 3 3
9
1. Mounting Screw
2. Micro-Link 2i Control/DataCORDER Module
3. Connectors
4. Test Points
5. Fuses
6. Control Circuit Power Connection
(Location: In back of controller)
7. Software Programming Port
8. Battery Pack
9. Expansion Module
Figure 3- 4 Control and Expansion Modules
3.1.3 Controller
CAUTION
Do not remove wire harnesses from control-
ler modules unless you are grounded to the
unit frame with a static safe wrist strap.
CAUTION
Unplug all controller module wire harness
connectors before performing arc welding
on any part of the container.
NOTE
Do not attempt to service the controller mod-
ules. Breaking the seal will void the warranty.
The Micro --Link 2i controller is a dual module
microprocessorasshowninFigure 3- 4.Itisfittedwith
test points, harness connectors and a s oftware card
programming port.
3.2 CONTROLLER SOFTWARE
The controller software is a custom designed program
that is subdivided into the Configuration Software and
the Operational Software. The controller software
performs the following functions:
a. Control supply or return air temperature to required
limits, provide modulated refrigeration operation,
economized operation, unloaded operation, electric
heatcontrolanddefrost. Defrostisperformedtoclear
build up of frost and ice and ensure proper air flow
across the coil.
b. Providedefaultindependentreadoutsofsetpointand
supply or return air temperatures.
c. Provideabilityto readand (ifapplicable)modifythe
Configuration Software Variables, Operating Soft-
ware Function Codes and Alarm Code Indications.
d. ProvideaPre-Tripstep-by-stepcheckoutofrefrigera-
tion unit performance including: proper component
operation, electronicandrefrigerationcontrol opera-
tion, heater operation, probe calibration, pressure
limiting and current limiting settings.
e. Provide battery powered ability to access or change
selected codes and set point without AC power con-
nected
f. Providetheabilitytoreprogramthesoftwarethrough
theuseofamemorycard.Thememorycardautomat-
icallydownloadsnewsoftwaretothecontrollerwhen
inserted.
3.2.1 Configuration Software (Configuration Vari -
ables)
The Configuration Software is a variable listing of t he
components available for use by the Operational
Software. This software is factory installed in
accordancewith theequipment fittedandoptionslisted
on the original purchase order. Changes to the
Configuration Software are required only when a new
controller hase been installed or a physical change has
beenmadeto theunitsuchastheadditionorremovalof
an option. A Configuration Variable list is provided i n
Table 3-4. Change to the factory installed
ConfigurationSoftwareis achievedvia aconfiguration
card or communications.
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