Instruction manual

3. DESCRIPTION OF EACH MODULES
IMSRM15-E6
82
Input calibration function
This function is used to forcibly match the displayed value with the zero or full scale point for the
purpose of correcting the AI zero or full scale point.
If the displayed value deviates from the H-AI module input value, the displayed value is calibrated
(corrected) at its zero and full scale points so as to match the H-AI module input value.
[Example]
Display of motor r.p.m.*
Desired display
A
ctual display
AI input level
Displayed
value
1000 rpm
0 rpm
Min. Max.
Minimum Maximum
6 rpm. 985 rpm.
Actual display
0 rpm. 1000 rpm.
Desired display
Calibration
Minimum Maximum
The maximum or minimum displayed value may deviate from the desired value due to an error
occurring in the external motor r.p.m.* output signal, shunt resistor or current transformer.
At this time, the displayed value is forcibly matched with the input corresponding to the maximum or
minimum value, thereby matching the displayed value with the actual r.p.m.*
More accurate monitoring becomes possible if calibration is performed by referring to the output from
a tachometer (clamp meter for current measurement).
* r.p.m: revolutions per minute