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ötz • Telefon 03641/66880 • Fax 03641/668866 • www.piezojena.com
87
In these adjustments, the actuator system can begin to oscillate in resonant frequency.
Please switch off the closed loop immediately by pressing the OFFSET potentiometer
button of the concerned amplifier. Then reset the last values entered! Continuous use at
resonance can damage the actuator!
Now you can try to increase the slew rate in the
slewrate/filter
menu
,
as long as no oscillation or
large overswing occurs.
11 troubleshooting
Please check all cables and connections first if the system is not working properly.
error
possible solution
no reaction at switch on
Check the power cord.
Check whether the main switch on the back side is on.
In the main switch there are two fuses. Remove the power cord
from your device and check the fuses. If one is damaged please
replace, only using fuses of the same value.
UDL/OVL-LED blinks
Check the connection between actuator and amplifier.
Check the actuator cable for damage.
UDL/OVL-LED light up
in closed loop mode
The actuator is not able to reach the commanded position.
Check the modulation input and offset.
Check your actuator for mechanical blocking.
Check whether your actuators move properly in open loop mode.
actuator oscillates in
resonant frequency in
closed loop
Check the PID-controller adjustments, reduce the ki-value,
Reduce the kd-value.
Check whether the function generator is still working.
read
back
parameters
always deviate with the
same level from the digital
target value
Please switch off the analog modulation input when it’s not used.
Command:
modon, x, 0
(see 8.5.3 commands). External signals
can cause interference or a command value offset.
actuator does not move in
spite of the applied analog
modulation signal on the
MOD input
Please switch on the analog modulation input by using command
modon, x, 1
(see 8.5.3 commands).
displayed / interface values
don’t represents the real
signal sequence
Maybe aliasing effect occurs. When the refresh rate is less than
the half working frequency (under sampling), aliasing will be
occur. This has an effect only for display, not for the real system.
table 14: errors
