AEC Glacier Series Air and Water Cooler Portable Chillers - Manual (Page 53)

Page 52 Glacier Series Portable Chillers
6-5 Auto-Tuning Glacier Chillers
Auto-tune fine tunes the control's PID to process requirements. Auto-tune whenever the process
under control changes. Don't be alarmed by the control's response. It may take the process
temperature above and below the set points as many as three times. It will then level off and
control to the process set point. Auto-tuning can take up to 30 minutes, and is best done before
any product is being run.
To auto-tune the controller:
• Press and hold down the
AT key for several seconds until the AT indicator flashes.
The AT LED flashes to indicate that the control is tuning itself.
When the AT LED light stops flashing, the controller is tuned and ready for operation.
6-6 Optional Communications
Standard Protocol
For RS-232C, RS-422, and RS-485 communications, a connection port on the cabinet permits
hookup to the host. The connection port is a direct pin-to-pin extension from the plug on the
back of the temperature controller. For pin outs, consult the control module communication
manual (AEC Part No. A0535959).
SPI Protocol
A connection port on the electrical cabinet permits easy hookup to an SPI network. For complete
information, refer to the AEC, Inc. Communication Protocol Converter manual (AEC Part No.
A05365273).