SATEC PM180 Operation Manual - Manual (Page 74)

‎Chapter 7 Programming the PM180 Programming Analog Outputs
72 PM180 Substation Automation Unit
Scaling ±1mA Analog Inputs
When programming engineering scales for directional ±1mA analog inputs, you
should provide only the engineering scale for the +1 mA input current. The
engineering scale for the 0 mA input current is always equal to zero. The device does
not allow you to access this setting. Whenever the direction of the input current is
changed to negative, the device automatically uses your full engineering scale
settings for +1 mA with a negative sign.
Scaling Analog Inputs for 0-2 mA and ±2 mA
The input scales for 0-1 mA and ±1 mA analog inputs are always programmed for
0 mA and +1 mA regardless of the desired input range. If you want to use the entire
input range of 2 mA or ±2 mA, set the analog input scales in your device as follows:
-
0-2 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: 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 convert voltage readings from the analog transducer that transmits
them in the range of 0 to 2 mA to the range 0 to 120V, set the full range for the
+1 mA analog input to 60V; then the 2 mA reading is scaled to 120V.
Programming Analog Outputs
The PM180 supports up to three expansion Analog Input/Output (AI/AO) modules
with a total of 12 analog outputs. I/O numbers are automatically assigned to the
outputs in the order of connection when the device is powered up.
To configure the analog outputs in your device, select General Setup from the Meter
Setup menu, and then click on the Analog Outputs tab. If you are programming your
device online, Analog outputs that are not present in the device are designated as
not available.
The available AO options are listed in the following table:
Option Format/Range Description
AO type 0-1mA
±1mA
0-20mA
4-20mA
The AO module type. When connected to the device,
shows the actual AO type read from the AI/AO module.
Output
parameter Selects the measured parameter to be transmitted
through the analog output channel (see Appendix A)
Zero scale Defines the low engineering scale (in primary units) for
the analog output corresponding to a lowest (zero)
output current (0 or 4 mA)
Full scale Defines the high engineering scale (in primary units) for
the analog output corresponding to a highest output
current (1 or 20 mA)