Conair MPA, MPW Performing An Auto Tune, To ensure a successful Auto Tune, verify that, Press

PERFORMING AN AUTO TUNE

WARNING: Electric shock hazard

This equipment is powered by high voltage. Always disconnect and lock out the main power source before opening the unit or the electrical enclosure to modify factory settings. Failure to disconnect and lock out the main power source can result in severe personal injury.

You should perform an Auto Tune after the first two hours of operation and whenever process variables change (changes in condenser water pressure, piping or molds; large ambient swings; new setpoint temperature) to ensure that the control continues to obtain good approximations of the PID constants used to compensate for the thermal lag of the system.

To ensure a successful Auto Tune, verify that:

❒The Auto Tune feature has been enabled. Auto Tune is enabled or disabled via dip switch 2 on the motherboard.

❒The process value is stable. A fluctuating process value will fool the software into making inaccurate tuning deci- sions. The software waits 5 minutes for the process value to stabilize before it starts the Auto Tune process. If the process value still fluctuates after 5 minutes, the Auto Tune terminates and the control displays the “At ti” error.

❒The control is in STOP mode and the process value is in ambient temperature. This allows the software to obtain good approximations of process parameters, which are crit- ical for performing an accurate tune. If this requirement is not met, then a good tune cannot be guaranteed.

❒The setpoint/process deviation is at least 25° F. If the absolute value of setpoint - process temperature is not greater than or equal to 25° F, the Auto Tune will terminate. The control will display an “At dEV” error.

1	Press	Stop	to shut down the chiller.
2	Disconnect and lock out main power to the unit.
3	Enable Auto Tune.
				8 7 6	5 4 3 2 1
	Open the electrical enclosure.
	Set dip switch 2 to ON.
	Close the electrical enclosure
	and restore power to the unit.

4 Restore power to the unit.

4-8OPERATION microKool Portable Chillers UGH004/0999