ElectraCOOL
LA550 Chiller
For Information Call
1 800-250-2920
electracool.com
One Tara Boulevard
Nashua, NH 03062 USA
international Inquiries (603) 888-2467
rev 7/03
12
Parameter Input Menu: The parameter input menu allows input of temperature
units, time units, PID parameters, and turns on or off auto-tune.
TEMPUNIT = °C or °F
TIMEUNIT = s: seconds, m: minutes, h: hours
AUTOTUNE = on/off. On turns on auto-tune where the controller determines PID
parameters. Once PID parameters have been determined
AUTOTUNE reads off.
P1 HEAT = Proportional band for heating, 0-99.9 °C or °F.
Factory Default
Value: 4.4
I1 HEAT = Integral term for heating, 0-999 seconds
Factory Default
Value: 22
D2 HEAT = Derivative term for heating, 0-999 seconds
Factory Default
Value: 2
P2 COOL = Proportional band for cooling, 0-99.9 °C or °F
Factory Default
Value: 2.4
I2 COOL = Integral term for cooling, 0-999 seconds
Factory Default
Value: 22
D2 COOL = Derivative term for cooling, 0-999 seconds
Factory Default
Value: 2
MAX PWM = Maximum voltage delivered to the thermoelectric modules. Set-
point range:16-24 VDC Higher values increase the maximum cooling
capacity of the chiller, but also increase the current draw. See figure
6 for cooling capacity vs. thermoelectric module voltage. The Factory
Default Setting: 21.0 VDC
Figure 6: Input Current with 300 Watt Load
Under Various Operating Conditions
