TE Technology TC-48-20 - Manual (Page 22)

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2.3.4 DERIVATIVE GAIN
Values: 0.00 to 10.00 (cycles per minute)
Default value = 0.00
Description: This senses the rate of change of the temperature and allows the controller to anticipate the
power needed to compensate for rapid changes in the system loading. The derivate gain is generally used
on very sluggish systems or where very quick response is necessary. It works in a similar way to the
integral gain, but it acts upon the change in the error, not the absolute error.
2.3.5 SENSOR TYPE
Values: 15K‐1 or 10K‐1
Default value = 15K‐1
Description:
15K‐1 should be selected when using the supplied MP‐3193 thermistor or other thermistors with
equivalent temperature‐resistance curves. See Appendix for further details.
10K‐1 should be selected when using thermistors equivalent to 10 k‐ohm, curve “B” temperature‐
resistance curve as defined by YSI Temperature, Inc.
If you are using two thermistors, they must have the same resistance versus temperature
characteristics. Also be sure that you have selected the correct sensor type. Otherwise a
dangerous condition could exist because the actual temperature could be higher or lower than
the temperature being interpreted by the controller.
2.3.6 CONTROL MODE
Values: COOL or HEAT
Default value = COOL
Description:
COOL mode causes the controller to increase the output power when the control sensor temperature is
greater than the set temperature.
HEAT mode causes the controller to increase the output power when the control sensor temperature is
less than the set temperature. (This mode can also be used with resistive heaters.)
Note: If you are using a TE device in the cool mode and you want to switch to the heat mode, you must
also switch the connection between JP4‐3 and JP4‐4.
2.3.7 CONTROL RANGE
Values: ‐20 to 199, applies to both HIGH and LOW settings
Default value for HIGH = 070
Default value for LOW = ‐20
Description: Sets the maximum and minimum temperatures available in the SET TEMPERATURE menu.
This is a safety feature that helps to limit the set point to the safe operating temperature of the system
being controlled. Adjustments are in 1 °C increments, and the high setting must be higher than the low
setting.
Note: If the CONTROL RANGE is adjusted such that it is no longer inclusive of the SET TEMPERATURE, the
controller will continue to control to that SET TEMPERATURE. However, once you scroll to the SET
TEMPERATURE menu, the SET TEMPERATURE will automatically reset to be within the CONTROL RANGE,
and the output power will adjust accordingly. The SET TEMPERATURE can then only be set within the
CONTROL RANGE.