TE Technology TC-720 - Manual (Page 35)

2.4.6 DERIVATIVE GAIN
Values: 0.00 to 10.00 (cycles per minute)
Default value = 0.00
A value 0.00 turns this factor off in the PID algorithm
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.
For many thermoelectric systems such as the standard cooling assemblies sold by TE Technology acceptable
control can be achieved by turning this function off (0.00).
2.4.7 ALARM 1 TEMPS
Values: -40 to 199 or OFF for HIGH setting; -40 to 199 or OFF for LOW setting
Default value for HIGH = 60
Default value for LOW = -20
Description: This sets the high and low temperatures for signaling an alarm based on the control sensor
temperature. Adjustments are in 1 °C increments, and the high setting must be higher than the low setting. If the
HIGH setting is increased past 199, OFF is indicated and no alarm will be signaled based on the control sensor for
over-temperature conditions. If the LOW setting is decreased past -40, OFF is indicated and no alarm will be
signaled based on the control sensor for under-temperature conditions.
Note: If the controller senses an open circuit or a short circuit on the control sensor, the controller will
automatically turn off output power, regardless of the ALARM 1 FUNCTION setting.
2.4.8 ALARM 1 FUNCTION
Values: KEEP OUTPUT ON or TURN OFF OUTPUT
Default value = TURN OFF OUTPUT
Description: This setting determines what action will be taken when there is an alarm condition on the control
sensor. When KEEP OUTPUT ON is selected, output power to the TE device stays on during the alarm condition,
and the alarm 1 signal on JP2-8 is activated. When TURN OFF OUTPUT is selected, output power to the TE device is
turned off, and the alarm 1 signal on JP2-8 is activated.
The ALARM 1 and ALARM 2 outputs on JP2-8 AND JP2-10 will momentarily pulse on and off several times in
the first second after the controller is turned on. This happens as the microprocessor in the controller
configures itself, regardless of any alarm condition.
2.4.9 ALARM 2 TEMPS
Values: -40 to 199 or OFF for HIGH setting; -40 to 199 or OFF for LOW setting
Default value for HIGH = 60
Default value for LOW = -20
Description: This sets the high and low temperatures for signaling an alarm based on the optional, secondary
sensor temperature. Adjustments are in 1 °C increments, and the high setting must be higher than the low setting.
If the HIGH setting is increased past 199, OFF is indicated and no alarm will be signaled based on the secondary
sensor for over-temperature conditions. If the LOW setting is decreased past -40, OFF is indicated and no alarm
will be signaled based on the secondary sensor for under-temperature conditions.
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