Using an accelerometer with an output signal of 0.3 V/g the sensor generates a peak voltage of 4.5V for a
peak acceleration of 15g (example 1), corresponding to a 3.18Vrms value.
Example 1: => 15g => 4.5 V => 3.18 Vrms
Example 2: => 11g => 3.3 V => 2.33 Vrms
There is a wide variation in the g force generated by different feeders and hence great differences in the
strength of feedback signal. The maximum setting [P] can be used to adjust the feedback signal to a realistic
level.
9.2 Setting up instructions for using a controller in regulation mode
Connect the control equipment
Fit the sensor onto the feed equipment and connect to the controller
9.3 Determine resonant frequency
9.3.1 Manual setting of the vibrating frequency
A very low throughput setting must be used when adjusting the output frequency because it is possible to
have very large deflection, with a very low voltage when passing through resonance. To determine reso-
nance an analogue, moving-iron, RMS ammeter should be connected to the power output cable.
The reso-
nant frequency has been reached when the maximum amplitude is achieved with the minimum
current reading.
9.3.2 Automatic frequency search
•
Set throughput to zero
•
Switch on regulation mode (menu C 008, set Parameter ACC = I )
•
By activating the frequency search (menu C 008, select Parameter “A.F.S“ and press a cursor key to
start search) this will determine the optimum feeder setting. When the resonant frequency has been
found the controller will complete the search routine and return to the previous throughput setting (0).
9.4. Optimizing regulation
9.4.1 Control range adjustment
•
Set Parameter “P“ in menu C 096 to 50% (maximum limit)
•
Increase the through put ”A“ from zero. With a sufficient feedback signal from the sensor, the feeder
amplitude can be gradually increased to 100%.
•
If the maximum amplitude cannot be achieved with the 100% setting then further increase Parameter “P“
in menu C 008 and this will give more adjustment.
•
Leave menu C 008. In normal running mode the throughput is displayed in %. If there is a horizontal bar
in the upper first segment of the display, then the feedback signal is too low. Return to Parameter “P“ in
menu C 008 and reduce this setting. If it is not possible to reduce this any further then the throughput
setting must be reduced until the bar goes out.
9.4.2 Optimizing the regulation circuit
when the feeder oscillates or has insufficient regulation response to load changes.
The response characteristics in the regulation circuit can be in menu C 008 using Parameter “P.A“ (Propor-
tional Characteristic) and “I.A“ (Integral Characteristic).
Feeder throughput oscillates.
Reduce Parameter “P.A.“ in menu C 008 until the oscillating ceases.
If possible reduce Parameter “I.A.“ to zero or the lowest possible value.
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