COOPER INDUSTRIES INC FH1847N Manuale Utente
T245 Control System Manual
24
As you are adjusting any of the parameters, you can “try” the new setting right
away by moving the joystick and watching the hydraulic/pneumatic response. A very
good way to tune the proportional parameters is to have someone watch the override
handles on the hydraulic valves (or the cylinder or bellows in a pneumatic system) as you
operate the joystick from “just-on” to “full-on”; for best metering action, adjust the Start
PWM and Max PWM such that the whole travel of the joystick corresponds to full travel
of the override handle, with no “dead” region at the start or end of the joystick travel.
Note: It is very important that the proportional drive frequency be correct for the
type of valve installed in your system. Please see the next chapter for information
on how to set the drive frequency, and make sure it is correct before attempting to
adjust the PWM output parameters.
good way to tune the proportional parameters is to have someone watch the override
handles on the hydraulic valves (or the cylinder or bellows in a pneumatic system) as you
operate the joystick from “just-on” to “full-on”; for best metering action, adjust the Start
PWM and Max PWM such that the whole travel of the joystick corresponds to full travel
of the override handle, with no “dead” region at the start or end of the joystick travel.
Note: It is very important that the proportional drive frequency be correct for the
type of valve installed in your system. Please see the next chapter for information
on how to set the drive frequency, and make sure it is correct before attempting to
adjust the PWM output parameters.
When you are satisfied with the way the parameters are set up, press the “Store”
button. All of the lights will come on to indicate that the new parameters have been
stored. If you wish not to save the changes you have made, simply unplug the key. Then,
you can plug the key back in and start again from the original settings. If you have stored
a set of new parameters which are so far off from values which the machine will operate
with, press and hold the “Store” button until all the lights begin to flash. Release the
button and all of the Proportional Drive parameters will be reset to factory-default values.
stored. If you wish not to save the changes you have made, simply unplug the key. Then,
you can plug the key back in and start again from the original settings. If you have stored
a set of new parameters which are so far off from values which the machine will operate
with, press and hold the “Store” button until all the lights begin to flash. Release the
button and all of the Proportional Drive parameters will be reset to factory-default values.
Important: The key should not be left plugged in after you have completed the
set-up procedure. Leaving the key in may allow someone to change the parameters
accidentally, as well as allow the long-term vibration of the vehicle to damage the key.
accidentally, as well as allow the long-term vibration of the vehicle to damage the key.