Wavelength Electronics LFI-3751, User Manual

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Chapter 2 - Front Panel Operation
Setting Temperature Limits
Setting Temperature Limits
If the thermoelectric or resistive heater drives the load temperature
beyond the temperature limits, the output will shut off and the
T LIMIT
LED will fl ash.
•
Press and release the TEMP LIMIT Button . The high and low limits
will alternate on the display three times before reverting to the Display
Select Switch selection.
•
Rotate the Digi-Pot Adjust Knob to change the value displayed.
•
The LFI-3751 uses the lowest number as the Low Temperature LIMIT
and the highest number as the High Temperature LIMIT.
•
The temperature limits will not be updated until the Digi-Pot stops
moving.
•
The T LIMIT LED in the Status Section lights solid red to indicate the
limits are displayed and can be adjusted.
•
The Temperature Limits are disabled when thermistors or RTDs are
confi gured to display resistance rather than temperature.
•
High Temp Limit and Low Temp Limit settings are saved in non-volatile
memory.
•
If you push and release the TEMP LIMIT Button or rotate the Display
Select Switch while displaying the temperature limits, the display will
revert to the prior Display Select Switch selection.
•
If the T LIMIT LED fl ashes and the unit beeps, the load temperature
has exceeded one of the limits. The output is forced off. Press the
Output Button to clear the error. If cleared, the unit beeps three times.
Press the Output Button again to re-enable output current. If the error
persists, the unit will sound a long beep. Once the error is corrected, you
can press the
Output Button to re-enable output current.
•
RS-232 Command: [T LIM HIGH], [T LIM LOW]
HOLD FOR LOCAL
RS-232
RS-232 ADDRESS
P ACT T
LIM I
AUX T
TE V
SET T
TE I
B
C
I
A
D
ERROR
°
C
HOLD SHIFT FOR
SHIFT
STATUS
TEMP LIMIT
REMOTE
T LIMIT
LIMIT I
SENSOR
RS-232 ADDRESS
P ACT T
LIM I
AUX T
TE V
SET T
TE I
B
C
I
A
D
°
C
HOLD SHIFT FOR
SHIFT
REPEATS 3 TIMES
decrease
increase
T LIMIT
BEEP
T LIMIT LED fl ashes when load
temperature exceeds either High
or Low Limit Temperature. One
long beep sounds if error has not
been corrected after pressing the
Output Button .
Display Temperature Limits
Default Temperature Limits
= 35.0°C
= 10.0°C
High Temp Limit
[T LIM HIGH]
Low Temp Limit
[T LIM LOW]
2