Delem DA-65, Manual, Page: 228 / 239

Delem
V1101, 9.26
Control voltage to part support system
The control voltage to the part support system can be tested in the module test of the diagnostic
program. The voltage can be varied between -255 and 255 DA-points, which resembles a range
between -10V and 10V.
The part support system should respond to the control signal as follows:
•
At a control signal of 0 V the part support should not move.
•
At a control signal of 40 mV (1 DA point for DA60 series controls) the part support should
not stand still and should reach a maximum speed of 0.5°/s. When the part support has an
angle range of e.g. 60°, it should take at least 120 s to move the part support from its
minimum to its maximum angle, at a control signal of 40 mV.
•
At a control signal of -40 mV, the part support should not stand still and the part support
should reach a maximum speed of 0.5°/s in the opposite direction. When the part support has
an angle range of e.g. 60°, it should take at least 120 s to move the part support from its
maximum to its minimum angle, at a control signal of -40 mV.
•
The relation between input voltage of the part support and the corresponding part support
speed should be linear. Non-linearity can have a bad influence on the part support
movement.
Potentiometer voltage
The feedback voltage from the potentiometer should have a large range between minimum and
maximum values which correspond with the minimum and maximum angle. This will benefit
the behaviour of the part support control system.
The feedback voltage is converted to AD points, ranging from 0 to 1023. In formula, the
potentiometer voltage has to meet the following requirement:
This means a difference of 1 AD point should correspond to a part support angle of maximal
0.1°.
Play and stiffness of mechanical construction
Play
The play of the potentiometer construction has to meet the following requirement:
Play can cause a worse standstill of the part support en can lead to an increment in overshoot.
Stiffness
The stiffness of the mechanical construction of the potentiometer has to be large enough to have
no negative influence on the measurement of the part support angle. An insufficient stiffness can
increase the maximum position error and can cause an increased overshoot.