TE Technology TC-48-20 - Manual (Page 15)

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Use protection devices to prevent hazardous conditions and/or damage to the load (e.g. cooling
assembly, heater, etcetera) and other related equipment. Protection devices must operate
independently of the temperature controller circuitry. Protection devices should be placed at all
points on the load and related equipment where a hazardous condition can be detected. These
protection devices should de‐energize the TC‐48‐20, the load, and, as necessary, other related
secondary equipment. It is further recommended that such devices require the user to remove
and correct the root cause of a fault before allowing the TC‐48‐20, the load, and related equipment
to be re‐energized. Protection devices should include, but are not limited to:

Fuses to prevent against electrical overloads,

Over/under temperature thermostats to prevent against hazardous and/or damaging
temperatures,

Liquid flow meters to prevent against damage due to loss of coolant flow
The TC‐48‐20 controller (in conjunction with the standard and optional sensors) can detect under‐
temperature and over‐temperature conditions, and it can be configured to de‐energize the load
when such a condition is detected. However, hazards and/or risk of loss or damage to the load
(e.g. cooling assembly, heater, etcetera), and/or secondary equipment could still occur if the
temperature controller and/or sensors were to malfunction. Therefore, independent, redundant
protection devices are recommended in addition to the safeguards provided by the temperature
controller. For the purposes of this manual the temperature controller and sensors are not
considered protection devices.
The controller does not have an internal fuse or circuitry to limit current. Therefore, an external
fuse, appropriately rated for protecting the controller/TE device, should be connected between the
power supply and the controller to prevent damage to the controller/TE device and to prevent
injury to the user should an over‐current condition occur. Alternately, a power supply with integral
over current protection can be used if it is appropriately sized for protecting the controller/TE
device.
1.4.1 One Power Supply Operation:
Make sure the power supply is NOT energized while making electrical connections to the
controller.
a) Connect the constant DC voltage power supply, ≥9 V but <50 V to the controller:
Positive (+) power supply terminal to JP4‐1
Negative (‐) power supply terminal to JP4‐2
b) Do NOT connect the TE device to the controller at this time (unless you are certain the set point is
within the allowable range of the TE device).
c) See the “Controller Hookup Diagram (One Power Supply Setup)” for further details.