Cryo-con Model 24C
Front Panel Menu Operation
Control Types
Enumeration, Default: Man
The Type filed selects the actual control algorithm used for the selected loop.
Loop control modes are:
1.
Man
for Manual control mode. Here, a constant heater output power is
applied when the unit is controlling temperature. The Pman field selects
the output as a percentage of full-scale.
2.
Table
. This is a PID control mode where the PID coefficients are
generated from a stored PID table based on setpoint.
3.
PID
for standard PID control.
4.
Off
. In this mode, the controller will not apply power on this output
channel. Note that the Model 24C is a dual-loop controller. The Off
control mode is used if regulation is desired only on the other channel.
5.
RampP
. This is a temperature ramp mode. When a ramp operation is
complete, the controller will revert to standard PID mode control at the
final setpoint.
6.
RampT
. This is a temperature ramp mode that uses the PID tables to
generate tuning parameters.
For more information on control algorithms, refer to the
Heater Control Types
table
above.
For more information on temperature ramps, refer to the section on
Temperature
Ramping
below.
Output Power Limit
Numeric entry, Default: 100%
The Power Limit field defines the maximum output power that the controller is allowed
to output. It is a percent of the maximum allowed output. Maximum value is 100% and
minimum is 15%.
The Power Limit is applied to the HI range only.
i
Note:
Output Power Limit is an important cryostat protection
feature. The user is encouraged to apply it.
Maximum Setpoint
Numeric Entry, Default: 1000K
The Maximum Setpoint field is used to prevent the casual user from inadvertently
entering a temperature that might damage the cryostat.
Maximum value is 10,000K and minimum is 0 K.
Setpoint values use the temperature units selected for the controlling input channel.
See the section on
Temperature Displays
.
i
Note:
The Maximum Setpoint selection is an important cryostat
protection feature. The user is encouraged to apply it.
PID Table Index
Numeric entry, Default: 0
The PID Table index line is used to identify the number of the user supplied PID Table
that will be used when the Table control mode is selected. The Model 24C will store
up to six PID Tables. They are numbered zero through five.
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