Question { Siemens, 10846 }

Can we calibrate an actuator?

Answer

You cant calibrate an actuator, you can just do setting.(
setting means better performance and more accurate ).
But calibration is the process of measuring the actual
performance of an instrument-under-test using lab
instruments ( or we can do this in the field ) that in
turn have significantly better performance than the
instrument-under-test. The measured performance is then
compared to published data sheet specifications. If observe
the instrument to be out-of-specification, instrument must
adjust and re-test .( for example we can do calibration for
a thermocouple or pressure transmitter )

Question { 8355 }

why we are using perforted cable tray for control cable and
ladder tray for power cable

Answer

Due to the high current flowing through the power cable
that warms the cable and its temperature rises so we use
ladder tray for power cable and the temperature of the
power cable can be exchanged with the surroundings.
We cant use ladder tray for control cables because the
control cables have high bending capability ( flexibility)
which is dropping belly ( belly bend downward ) and the
control cables temperature is always near the ambient
temperature and the perforated cable tray is suitable.