Regulus uREG, User Manual

Page: 104 / 107

uREG User Manual
104
values of attenuation/gain coefficients for most measurements taking place in the controller.
For example, the value of the measured current ‘Iw’ is determined by the relationship:
Iw = Ip * (1 + p * 0.000122), where ‘Ip’ is the measurement value before calibration.
Thus, the measured value can be corrected within the range ± 1.55 %.
Derivative values (like power) can be corrected within a wider range ± 2.5 %.
The corrections are saved in the device as settings and can be changed during inspection of the
device or its operation. However, it is necessary to follow standard values of respective current
and voltages. Calibration can be performed for current-voltage characteristic points other than
those used during factory calibration.
Unless in-house regulations state otherwise, it is recommended to conduct periodic checks
of measurement paths associated with the unit every three years.
Observable ageing effects also refer to optoinsulation of digital inputs. This phenomenon is
associated with penetration of contaminating particles into the semiconductor plate of the
optical isolator light diode, causing gradual degradation. Intensity of this phenomenon depends
on the ratio of lighting time to blanking and ambient temperature. Lasting for many years,
deterioration of parameters can reach even 20 % of the initial performance. The ageing
property was taken into account for parameters of digital input circuits. However, this fact must
be mentioned and controlled. It is recommended to check switching thresholds of inputs after
10 years of operation.
→ Re 3:
Faults included in the 3rd class can result in two types of consequences:

Momentary interruption of routine operation and immediate resumption. Then, the
event is recorded in reports (it can be caused by internal interruption or a software
error).

Interrupted operation or computer crash without any attempt to reboot, which usually
means an error in the device software. The controller will resume operation after
restarting.
In each of the two cases, it is recommended to record data relating to event circumstances and
the observable status of the device and contact the manufacturer’s technical personnel.