Fluke RUSKA 7252, User Manual

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RUSKA 7252
Users Manual
6-18
glb51.bmp
Figure 6-11. Auto-Tune Procedure Screen
If any control valves or the high speed inner loop pressure sensor has been replaced, the
Auto-Tune should be run to characterize the new hardware.
Fan Operation
The fan in the RUSKA 7252 can be turned on or off. It is recommended to keep the fan
ON since this will extend the life of the power supply.
When operating the system in either a very cold or hot environment, if the oven is unable
to maintain the temperature of the internal oven, it will generate error Oven Control
Failure Error messages. The operator can review the temperature and duty cycle of the
oven by pressing the MODE | MENU | DISPLAY keys. The unit must have been
warmed up for a minimum of 2 hours prior to determining the condition of the oven
temperature control. The temperature of the sensor should be controlled to 50 ºC. The
Duty cycle indicates the percentage of time that the oven control is turned on in order to
maintain the oven at the proper set-point of 50 ºC. A unit that is operating properly, after
it has fully warmed up, should indicate a sensor temperature of 50 ºC and a duty cycle
between 10 to 90%.
If operating the instrument in a very cold environment and the oven duty cycle is at a
high percentage (>90%) you will need to turn the fan off. If you are operating in a warm
environment or when multiple systems are housed in consoles without adequate
ventilation, the system may become too hot and generate the oven control failure error
message. If operating the instrument in a warm environment and the oven duty cycle is at
a low percentage (>10%) you will need to turn the fan on.
When the operator changes the status of the fan, it will default to that condition until it is
changed by the operator.