Alpha Omega Instruments 800 Series User Manual

TROUBLESHOOTING
Check sensor wiring for reverse wires, open circuits, or shorted
circuits.
Check the sensor programming and configuration page in Step
1 of the Manual for your particular temperature sensor.
Ambient temperature may be too hot or too cold.
Calibration offset parameter is set too high or too low.
These error messages
all indicate that their is
something wrong with
the temperature sensor
input.
[Err1], [Err2],
[Err3], or [Err4]
shows on display
Check that [Il`A] and [IL`B] are not set to 0.0.
Check that Alarm 3 is not turned off. Also
[a3lo] and
[a3hi] should be set outside the normal operating range.
See Section 5.0 for details.
Check that the % LED is not lit indicating Manual mode (±
percent current output).
Several parameters
control whether or not
the TEC output is active
No output
Possible Solution(s)informationCondition
Points of Clarification
[Ilsp] = Current Limit Set Point = Temperature that the
[Il`a] and [Il`b] parameters work with.
[Il`a] = Current Limit Above in % = % current Limit
that will be applied to the TEC when the process
temperature goes above the
[Ilsp].
[Il`b] = Current Limit Below in % = % current Limit
that will be applied to the TEC when the process
temperature goes below the
[Ilsp].
Note: % current limits are based on the maximum current
of the controller purchased.
Confusion between Set
Point and Current Limit Set
Point and current Limits
above and below.
During normal operation,
these are used to limit the
maximum output of the TEC
controller.
Why Two current limits?
or
[Ilsp] doesn’t work!
or
What is
[Ilsp],
[Il`a], and
[Il`b] anyway!
 Setting a Proportional Band to zero causes the temperature controller’s output to act as an ON/OFF controller. See Section
5.0 under “Control Methods” for more details.
 Remember that LED 1 (% Cooling Power) and LED 2 (% Heating Power) will always indicate the status of the temperature
controllers Cooling and Heating outputs. These LED’s will blink at the duty cycle that represents the % Power being applied for
that output. For instance, if LED 1 is blinking at a 50% duty cycle (½ on and ½ off), then the temperature controller is
COOLING the TEC at approximately 50% output power. Likewise, if LED 2 should be OFF, then no Heating power is being
applied.
Appendix L
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 112

Alpha Omega Instruments 800 Series Specifications

General

Brand	Alpha Omega Instruments
Model	800 Series
Category	Controller
Language	English