Cryo-con Model 24C
Front Panel Menu Operation
Power-up in Control Mode.
Default: Off
The Auto Ctl: field sets the power up mode of the controller’s loops. Choose ‘Off’ for
normal operation where the control loops are engaged by pressing the
Control
key
and disengaged by pressing the
Stop
key. When on, the controller will power up, then
after ten seconds, will automatically engage the control loops.
Caution
: When enabled, the Power-Up in Control mode feature
causes the controller to engage the control loops automatically
whenever AC power is applied. Please exercise caution in the use of
this feature.
Over Temperature Disconnect Configuration
Navigate to the OTD Configuration menu by pressing the
System
key and then
selecting the Over Temp Config field.
The Over Temperature Disconnect (OTD) feature monitors a selected input channel
for an over temperature condition. If this exists, all heaters outputs are disconnected
and the Loop Status indicator is set to "OTDisconn". A mechanical relay is used for
the disconnect so that the load is protected, even if the condition was caused by a
fault in the controller’s output circuitry.
The OTD must first be configured to monitor one of the input channels. Note that the
OTD feature is completely independent of control loop function and may monitor any
input.
Next, an OTD Setpoint must be specified. This is the temperature at which an over
temperature shut down is asserted. Temperature units are taken from the source
input channel.
Finally, the OTD function must be enabled.
Important
: The Over Temperature Disconnect is an important
cryostat protection feature. The user is encouraged to apply it.
Over Temperature Disconnect
Configuration
1
+
Sets the Over Temperature Disconnect enable.
Selections are On or Off.
2
+
Sets the Over Temperature Disconnect source
input channel. Selections are ChA or ChB.
3
#
Sets the Over Temperature Disconnect setpoint
temperature.
Table 21: Over Temperature Disconnect Configuration
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