4700 Refrigerated Sampler Service Guide
Section 5 Electrical Troubleshooting and Diagnostics
5-12
5.2.3 Fan Control
Access fan control with the code
326
(FAN).
Select YES to turn the evaporator fan off during a defrost cycle.
Select NO to keep the fan on during defrost.
5.2.4 Diag Menu
This menu is for testing the liquid detector, testing the flow
meter port, and reinitializing the sampler. Access this menu by
entering the code
3424
(DIAG).
Each of the three options has a YES/NO on the second line so you
may select NO and skip this test or YES to perform it.
TEST LIQUID DETECTOR will run the pump to fill the line to
the liquid detector and then purge the line. This will be repeated
5 times. If there is a pump jam or no liquid is detected, a message
will be displayed until a key is pressed.
TEST FLOWMETER PORT requires a test plug in the 16 pin
communications interface port. This test is the same as the
Test
Flow Meter Port
test under Section 5.1
4700 Diagnostics
.
REINITIALIZE will restart the software and initialize all vari-
ables.
CAUTION
This will return all stored values to their default values.
5.2.5 Diagnostic Data
Access this menu with the code
73337
(REFER).
Selecting YES causes the sampler to send a comma-separated
text string on the serial port every minute. Seven items are
reported in the string.
The
first
data field reports each minute as a 3-digit time,
counting from 000 to 999 and then starting over. The
second
field is
Temp = xx.x
where
xx.x
is the reading from the refrig-
erator air temperature sensor in °C. The
third
field is
Delta =
xx.x
where
xx.x
is the rate of temperature change while the com-
pressor is running. The
fourth
field is
Evap = xx.x
where
xx.x
is
is the reading from the evaporator coil temperature sensor in °C.
The
fifth
field reads
Comp ON/OFF
, indicating whether the com-
pressor is on or off. During a defrost cycle, this field will report
Defrost ON
. The
sixth
field reads
Heater ON/OFF
, indicating
wether or not the compartment heater is running. The
seventh
field reads
Fan ON/OFF
, indicating whether or not the evaporator
fan is running.
Each line of data will stop for one minute following
Evap = xx.x
.
The rest of the text string is sent at the next minute, then fol-
lowed by the first four fields of the next string, and so on. This
pause allows the status of the compressor, heater, and fan to cor-
rectly appear on the line for that minute.
5.2.6 Test Time/Date
This menu is accessed with the code
8378
(TEST) from the
standby screen, or
T98
while in the TEST menu (see Table 4-2
CPU Board Functional Tests
). It displays the time and date the
DEFROST WITH FAN OFF?
YES NO
TEST LIQUID DETECTOR?
YES/NO
TEST FLOWMETER PORT?
YES/NO
RE-INITIALIZE?
YES/NO
DIAGNOSTIC DATA?
YES NO
Summary of Contents for 4700
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Page 6: ...Isco 4700 Refrigerated Sampler Service Guide Safety iv ...
Page 12: ...4700 Refrigerated Sampler Service Guide Table of Contents x ...
Page 30: ...4700 Refrigerated Sampler Service Guide Section 1 Introduction and General Guidelines 1 18 ...
Page 60: ...4700 Refrigerated Sampler Service Guide Section 2 Sample Delivery System 2 30 ...
Page 108: ...4700 Refrigerated Sampler Service Guide Section 4 CPU and Power Supply 4 26 ...
Page 124: ...4700 Refrigerated Sampler Service Guide Appendix A Electrical Diagrams A 2 ...
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Page 128: ...4700 Refrigerated Sampler Electrical Wiring A 6 Figure A 5 4700 CPU schematic diagram ...
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