Cryo-con Model 24C
Front Panel Operation
Loop Status Displays
When the Model 24C is not controlling temperature, the status of the Loop output is
shown.
The first character of the Loop Status Display is always the loop number, which will be
either a superscripted 1 or 2 corresponding to Loop 1 or Loop 2.
The Loop number is accompanied by the heater status as follows:
1.
-OFF-
Indicates that heater output is
functional and the control loop is off or
disabled.
For the primary heater, Loop 1, the range is also shown. Range settings may
be either
Hi
,
Mid, Low
or
Min
. The range is set in the
Loop 1
menu.
For the secondary output, or Loop 2, the range will be shown as
Hi
or
Low
.
The range is set in the
Loop 2
menu.
2.
Overtemp
indicates that the controller’s Internal Temperature Monitor circuit
shut off the heater. This fault is usually the result of a shorted heater or use of
a heater with significantly less resistance than the selected load resistance.
After the controller has been allowed to cool to an acceptable temperature,
pressing the
CONTROL
button will clear the
error and restore control mode.
3.
OTDisconn
indicates that the heater output was disconnected by the Over
Temperature Disconnect Monitor. This monitor is configured by the user and
functions to disable the heater if a specified over temperature condition
exists on a selected input channel. See the
System
menu for information on how to
configure and use this important feature.
If the Model 24C is controlling temperature (loop ON), the heater status display shows
the loop output as a percentage of full scale.
This example shows the Heater Status for Loop 2 in a Model 24C controller. The unit
is in control mode and is outputting 30% of full scale
output current. This means that the output power is
(30%)^2, or 9% of 25 Watts.
2HI
1
1
48
1
