SPECIAL CONFIGURATIONS
The Series 800/850 TEC Controllers offer great user flexibility. The following
sections describe how to set up special configurations that provide even more
control over the output of the Series 800/850 TEC Controllers.
Please note that Output 4 must be specified as either Retransmit OR one of the
communications protocols (EIA/RS-232 or EIA/RS-485).
SHUTTING DOWN THE OUTPUT
The TEC output of the Series 800/850 TEC Controllers can be shutdown in a
number of ways. This section describes these possible combinations.
Manual Shutdown
The user can manually shutdown the Series 800/850 TEC Controllers by shorting
out pins 1 & 6 on the CTRL-IN connector.
Automatic Shutdown
The user can also have the Series 800/850 TEC Controllers automatically shutdown
using some of the options described earlier.
¾ Input 2 (as Event)
Using optional Input 2 for automatic shutdown requires some form of external signal
to tell the input that it needs to shutdown. For example, using a programmable logic
controller (PLC), the user could monitor the base temperature of a heat sink
connected to the TEC being controlled. When the temperature exceeded a certain
temperature the PLC would “tell” the controller to shut down. Optionally you can
perform other function witht the Input 2 option, namely:
i) Switch to another Set Point
ii) Turn off control outputs and disable alarms
iii) Turn off control outputs only
iv) Lockout the front panel
v) Switch to manual mode (output fixed current)
vi) Initiate Auto tuning
vii) Clear alarm
The signal to the controller should be 0 to 2V to signal a LOW input and 3V to 36V to
signal a HIGH input. You can also use a contact closure accross the voltage
terminals. The resistance must be less than or equal to 2K ohms to signal a LOW
input. Over 23K ohms will signal a HIGH.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 100
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