Solid State Cooling Systems THERMOCUBE 200 - Alarms; Auto-Tuning

THERMOCUBE 200/300/400 THERMOELECTRIC CHILLER MANUAL 52-11300-1
SOLID STATE COOLING SYSTEMS, 167 MYERS CORNERS ROAD, WAPPINGERS FALLS, NY 12590 15
TELEPHONE: (845) 296-1300 FAX: (845) 296-1303 WEB: WWW.SSCOOLING.COM VERSION M28
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 AUTO-
TUNE reads OFF.
P1 HEAT = Proportional band for heating, 0-99.9 °C or °F.
P1 HEAT Factory Default Value = 5.6
I1 HEAT = Integral term for heating, 0-999 seconds
I1 HEAT Factory Default Value = 22
D2 HEAT = Derivative term for heating, 0-999 seconds
D2 HEAT Factory Default Value = 2
P2 COOL = Proportional band for cooling, 0-99.9 °C or °F
P2 COOL Factory Default Value = 2.8
I2 COOL = Integral term for cooling, 0-999 seconds
I2 COOL Factory Default Value = 22
D2 COOL = Derivative term for cooling, 0-999 seconds
D2 COOL Factory Default Value = 2
5.3 ALARMS
The ThermoCube chiller has two TTL level alarms, one for
temperature and one for system failure:
Temperature: TTL high (>4 VDC) fluid temp below alarm set point
TTL low (<0.5 VDC) fluid temp above alarm set point
System: TTL high (>4 VDC) system operating normally
TTL low (<0.5 VDC) system failure has occurred
A list of system failures causing the system alarm to change to TTL
low can be found in Section 6. In the event of a system failure, the
alarm type will be shown on the front display.
5.4 AUTO-TUNING
Some models of the ThermoCube 300 and 400 chillers come with an
automatic tuning (auto-tune) feature. Changing the PID parameters
is normally not recommended unless the RTD probe is moved to a
new location. However, the controller can calculate new PID
parameters via the auto-tune function.