1MRS240173-IB B
Section 5
4x Registers
REF615R
29
DPU2000R Modbus Point List Mitigation Manual
5.1.1.2.2
Ratio scaling
The description of how to apply ratio scaling can be found from "REF615R Modbus
Communication Protocol Manual" document ID 1MRS240047-IB
5.1.1.2.3
Multiplicative scaling
The multiplicative scaling will multiply a scale factor on top of the original register's scale
factor. It makes convert readings between primary, secondary and per unit very easy.
On the right pane of the PCM600/CMT UDR view, click on the "Scaling" pull down menu,
and pick up "Multiplicative" option. Fill in the scale factor in the "Min in" column.
Example of converting phase A current reading from per unit to primary ampere is as
following:
a. From the left pane of the UDR view, highlight the signal of "CMMXU1: 1. IA-A IA
IB IC IA Amplitude magnitude of instantaneous value"
b. Pick up an available address from the right pane, and click on “Go to right” button
to move the signal to the right pane.
c. If the primary CT rating is 600A and if the original signal's scale factor keeps default
value of 100, user only needs to fill in number of six into the "Min In" column.
Eventually 600 will be UDR's effective multiplicative scaling.
Figure 3:
UDR multiplicative scaling factor for
"LD0.CMMXU1.A.phsA.instCVal.mag.f"
5.1.1.2.4
Divisor scaling
The divisor scaling will divide a scale factor from original register's scale factor. It makes
convert readings between primary, secondary and per unit very easy.
On the right pane of the PCM600/CMT UDR view, click on the "Scaling" pull down menu,
and pick up "Divisor Scaling" option. Fill in the scale factor in the "Min in" column.
Example of converting phase A voltage reading from per unit to primary voltage is as
following:
a. From the left pane of the UDR view, highlight the signal of "VMMXU1:
1.V_INST_A.VA VB VC VA Amplitude magnitude of instantaneous value."
b. Pick up an available address from the right pane, and click on “Go to Right”
button
to move the signal to the right pane.
