E-Mon E-PS-A-RTU-N - Manual (Page 70)

Chapter 4 Power
S O F T W A R E G E N E R A L M E T E R S E T U P
70 PowerSmart+ Advanced Power Quality Meter
If the parameter represents a signed (directional) value, you should provide only the
engineering scale for the +1 mA output current. The engineering scale for the 0 mA output
current is always equal to zero for all values except the signed power factor, for which it is
set to 1.000 (see “Scaling Directional Power Factor” above). The device does not allow you
access to this setting if the parameter is directional. Whenever the sign of the output
parameter is changed to negative, the device automatically uses your full engineering scale
settings for +1 mA with a negative sign.
Scaling Analog Outputs for 0-2 mA and ±2 mA
The output scales for 0-1 mA and ±1 mA analog outputs are programmed for 0 mA and +1
mA regardless of the desired output current range. To use the entire output range of 2 mA
or ±2 mA, set the analog output scales in your device as follows:
0 0 0 0----2 mA 2 mA 2 mA 2 mA: set the 1 mA scale to 1/2 of the required full scale output for uni-directional
parameters, and set the 0 mA scale to the negative full scale and the 1 mA scale to zero for
bi-directional parameters.
± ± ± ±2 mA 2 mA 2 mA 2 mA: set the 1 mA scale to 1/2 of the required full-scale output for both uni-directional
and bi-directional parameters.
For example, to provide the 0 to 2 mA output current range for volts measured by the meter
in the range of 0 to 120V, set the 1 mA scale to 60V; then the 120V reading will be scaled
to 2 mA.
Programming the Analog Expander Programming the Analog Expander Programming the Analog Expander Programming the Analog Expander
Your meter can support up to two analog expanders that are connected through a serial
RS-422 interface to the meter port COM2. Each expander has its own address 0 or 1 on
the serial interface and provides 8 analog channels with options for 0-1mA, ±1mA, 0-20mA
or 4-20mA output currents.
To configure the Analog Expander outputs in your device, select General Setup from the
Meter Setup menu, and then click on the Analog Expander tab.
Analog output channels are enumerated in the following manner: channels 1 through 8 are
associated with the analog expander with address 0, while channels 9 through 16 are
associated with the analog expander with address 1.
The available analog expander outputs options are described in the following table.