Thermcraft XST-3-0-36-3V - Manual (Page 158)

Load Current Monitoring and Diagnostics Installation and Operation Handbook
D-12 2408 and 2404 Controller
THE SCALING FACTOR
The value of the current displayed on the controller is scaled using the scaling factor. This is
found in the
inSt ConF list. It is set, by default, to 100 and assumes a single turn
through the current transformer. If two turns are made through the current transformer it will
be necessary to adjust the scaling factor to 50 to obtain the same reading.
Under normal conditions you should not need to change the scaling factor.
If, however, you wish to change the sensitivity of the current reading, for example, to read
very low currents you may need to change the number of turns through the PDCTX and/or
adjust the scaling factor to compensate. See also note 1 below.
TO ADJUST THE SCALING FACTOR
Do This This Is The Display You Should See Additional Notes
Press button
until inSt Conf is
displayed
Press
until
LC.Hi is displayed
Press
or
to change the
scaling factor
Note 1:-
Minimum Resolvable Current
TE10
4A RMS. It is not possible to read currents lower than 4A when using a TE10.
PDCTX 4A RMS for a single turn through the PDCTX
Should you wish to read currents lower than 4A using a PDCTX it is necessary to increase the
number of turns through the PDCTX and adjust the scaling factor to compensate.
For example: To read 1.0A wind 4 turns through the PDCTX and adjust the scaling factor to
25 as shown in the table below.
Scalar = 100/N Where N = Turns through PDCTX
N Scalar N Scalar
1 100 5 20
2 50 10 10
4 25
Maximum Resolvable Current
TE10
Determined by the maximum range of the SSR
PDCTX 100A (or 100 ampere turns)
Finally Exit configuration level. See Chapter 5.
inSt
Conf
LC.Hi
100