Wavelength Electronics LFI-3751, User Manual

Page: 18 / 132

Rotate the Display Select Switch to SET T and toggle the Shift Button
OFF . The setpoint temperature is displayed. Rotate the Digi-Pot Adjust
Knob until 25°C is displayed.
Display and Adjust Setpoint Temperature
5
Set Temperature Limit
4
Press and release the TEMP LIMIT Button . Two numbers will alternate
on the display. If the thermistor temperature exceeds these limits, the
output current will be turned off. The numbers will alternate three times
before the display reverts to the parameter selected by the
Display Select
Switch , in this case, LIM I . Assume that the load should not be allowed
to freeze (0°C) and should not exceed 55°C. Rotate the Digi -Pot Adjust
Knob until 0°C and 55°C are displayed. The highest temperature is
selected as the High T LIMIT and the lowest temperature is used as
the Low T LIMIT .
Chapter 1 - Quick Start
Nine Steps to Operating the LFI-3751
Set Limit Current
3
With the output off, set the limit current below the thermoelectric’s
maximum current. Assume the example thermoelectric’s maximum
current is 1.25 Amps. Set the Limit Current to 1.0 Amps. Rotate the
Display Select Switch to LIM I with the Shift Button OFF . The positive
and negative limits will alternate on the display. Rotate the Digi-Pot
Adjust Knob until 1.00 and -1.00 alternate.
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
P ACT T
LIM I
AUX T
TE V
SET T
TE I
B
C
I
A
D
°
C
18
P ACT T
LIM I
AUX T
TE V
SET T
TE I
B
C
I
A
D
AMPS
P ACT T
LIM I
AUX T
TE V
SET T
TE I
B
C
I
A
D
AMPS
Negative LIM I
Positive LIM I