A Quick Start Guide to the Model 54
USER DOCUMENTATION AND UTILITY SO TWARE
User documentation, utility software, LabView drivers and sensor curves
are on the CD provided. Additionally, they are available at:
http://www.cryocon.com/CCdownload/CustomerCD 2.zip
BASIC RONT PANEL OPERATION
Pressing the Power key will toggle the controller's AC power on and off.
This key must be pressed and held for more than two seconds.
Pressing the Stop key will immediately disengage both control loops.
Pressing the Control key will engage them.
Pressing the Home key will return the screen to the Home display from
anywhere in the sub-menus. The Home display is the primary display for
instrument status and can be configured by pressing the Display key.
CONTROL LOOP SETPOINTS
To access the setpoint for the control loops, press the Set Pt key and
then use the navigation keys to select Loop # , 2, 3 or 4. Use the keypad
to enter the desired setpoint and press the Enter() key to set it and
return to the Home display.
CLEARING A LATCHED ALARM
During an alarm condition, the Alarm LED on the front panel will light and
an audio alarm will optionally sound. To view the status of all alarms,
press the Alarm(5) key. To reset a latched alarm, press the Alarm(5) key
and then the Home key.
DISPLAY OPTIONS
The display time constant and display resolution fields may be accessed
by pressing the System(9) key.
The Display TC field is used to smooth temperature data with filters from
0.5 to 64 seconds. This is useful in noisy environments to provide stable
readings.
The display resolution field, Display-RS is used to set the number of
significant digits shown in temperature displays. Settings , 2,3 or Full.
CON IGURING A TEMPERATURE SENSOR
To configure an input channel for a specific temperature sensor, press
the Input( ) key. Then, use the drop-down box to select the desired input
channel.
Touch the Units: indicator to select the units displayed.
Touch the Sensor: field to select the desired sensor from a list.
For resistance measurements using Constant-Voltage AC excitation,
select the ACR sensor, then set a Bias Range and Bias Level. The range
sets the full scale range and level sets the percent of that range.
For advanced information on sensor configuration, see the user’s manual
section titled “Configuring a Sensor”.
ERROR DISPLAYS
A sensor fault condition is identified by a clipping or clamping message
as shown here. This usually indicates that the
sensor is open, disconnected or shorted.
If a temperature reading is within the measurement range of the
instrument but is not within the specified sensor's
calibration curve, a display of seven dot (.)
characters is shown.
Overtemp indicates that the controller’s Internal Temperature Monitor
circuit shut off the heater. This fault is usually the result of a shorted
heater. After the controller has been allowed to cool to an acceptable
temperature, pressing the Control key will clear the error and restore
control mode.
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.
ground loops and low frequency power-line noise pickup. High
frequency interference is eliminated by continuous shielding.
To work effectively, a good quality earth-ground point is essential.
ground.
Sensors and heaters must be electrically floating.
to their connector’s shield pin. Heater cables should have their
blocks.
connected to the connector's back-shell on the cryostat end. If this
the single-point grounding scheme. Do not compromise RFI
shielding by simply disconnecting shield grounds.
instruments.
