8.10 Jumpers; 8.11 Error Messages - Lakeshore 325 User Manual

8.10 JUMPERS

There are five jumpers located on the main circuit board of the Model 325. See Figure 8-8 for the location of the jumpers
(reference designators JMP1 through JMP5).
CAUTION: Only JMP2 and JMP4 should be changed by the user. Please consult with Lake Shore before
changing any of the other jumpers.
Reference
Silkscreen
Designator
JMP1 RUN / TEST
321 / 330
JMP2
D/R
JMP3
321 / 330
JMP4
D/R
JMP5

8.11 ERROR MESSAGES

The following are error message that may be displayed by the Model 325 during operation.
Message
D isab led
N o-Cu rve
S .-Ov er
S .-Un der
T .-Ov er
T .-Un de r
C anno t C o m mun i cate wit h
I nput Pr o c ess o r
D efec tiv e NOV R AM
I nval id N O VRA M
Service
Lake Shore Model 325 Temperature Controller User's Manual
Default
RUN
321 / 330
340
—
TC
321 / 330
340
—
TC
Input is turned off.
Input has no curve.
Input is at or over full-scale sensor units.
Input is at or under negative full-scale sensor units.
Input at or over the high end of the curve.
Input at or under the low end of the curve.
The main microprocessor has lost communication with the sensor input
microprocessor.
Defective NOVRAM. Contact Lake Shore.
Invalid data or contents in NOVRAM – Press and hold the Escape key
for 20 seconds to initialize NOVRAM. Refer to Section 4.18.
Description
Used for diagnostic purposes only.
Set at factory to reflect configuration of Input A where
321 / 330 = 1 mA excitation current on Pin 3 of the
connector and 340 = Pin 3 connected to shield. Refer to
Section 3.4.1.
Set at factory to reflect configuration of Input A where
DI/RE = diode/resistor and TC = thermocouple.
Set at factory to reflect configuration of Input B where
321 / 330 = 1 mA excitation current on Pin 3 of the
connector and 340 = Pin 3 connected to shield. Refer to
Section 3.4.1.
Set at factory to reflect configuration of Input B where
DI/RE = diode/resistor and TC = thermocouple.
Description
8-9