Chemglass CG-1972-65 - Manual (Page 12)

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3.4 Ramp-to-Setpoint & Soak Feature. A new feature of J-KEM’s controllers called ‘Ramp-To-Setpoint’
allows the controller to heat at a specific heating rate (e.g., heat to 120
o C at a rate of 5 o C/Hour), a second
feature called ‘Soak’ allows the controller to be programmed to stay at that temperature for a user
specified period of time before turning off.
NOTE: This feature should be used on the Setpoint Controller only (not on the Limit Controller).
Examples of Program Ramps
Setpoint
Temperature
Time
Ramp
Soak
Power Off
Setpoint
Temperature
Time
Ramp
Soak
Power Off
The controller is shipped with the Ramp-to-Setpoint feature OFF, the user must specifically turn Ramp-
to-Setpoint ON. When Ramp-to-Setpoint is OFF, the controller heats to the entered setpoint at the fastest
rate possible. When Ramp-to-Setpoint is ON, the controller heats at the user entered ramp rate.
The Ramp-to-Setpoint feature and its associated parameters are turned on and set in the controller’s
programming mode. The parameters of importance are:
SPrr
SetPoint Ramp Rate. Allowable Values: 0 to 9990 deg/Hr.
This specifies the desired rate of heating (cooling). Note, this parameter specifies the desired rate of
heating (cooling), but in cases of extremely high ramp rates the reaction will not actually heat faster than
the power of the heater will allow.
SPrn
SetPoint Ramp Run. Allowable Values: ON, OFF, Hold
This parameter turns the Ramp-to-Setpoint feature ON or OFF. During an active run, if this parameter is
set to ‘Hold’, the setpoint ramp stops and holds at its’ current value. This continues until the parameter is
set to ON or OFF. When set to OFF, the values in SetPoint Ramp Rate and Soak Time are ignored.
SoAK
Soak Time. Allowable Values: “- -”, 0 to 1440 min.
This specifies the amount of time to soak at the setpoint after the setpoint temperature ramp is complete.
A setting of “- -” causes the controller to remain at the final setpoint indefinitely. A numeric value causes
the controller to stay at the setpoint for the entered time and then turn power to the heater off after the
time expires.