Power Measurement ION 8000 Series - Analog Outputs; Setting the Zero and Full Scales

ION 8000 Series User Guide Analog Outputs
Chapter 10 - Inputs / Outputs Page 131
Analog Outputs
An ION meter’s analog outputs act as transducers. The meter measures power and
energy, and then sends that information via the analog outputs to a remote
terminal unit (RTU). The analog outputs issue industry standard 0 to 20 mA
current signals.
Four Analog Output modules control the optional I/O Expander’s analog output.
These modules are not linked or configured. Link the numeric output of another
ION module to the Source input of the Analog Output module—this value is
represented on the I/O Expander’s analog output port. Setup the Zero Scale and Full
Scale setup registers of the Analog Output module to the numeric range you want
to emulate. The settings in these modules are as follows:
Ensure that the module’s Port setup register matches the I/O Expander’s output
you want to control. If the port you want to use does not appear in the Port setup
register list, that port is in use by another module. Edit the Port setup register of
the module using that port and set it to NOT USED – the port is then available to
other modules.
See the ION 8000 series meter I/O Expander Installation and Basic Setup manual and
the technical note Digital and Analog I/O available from the Power Measurement
website for more information.
Setting the Zero and Full Scales
You control external devices by delivering a specific current or voltage that is
proportional to the source input. This is done by setting the Full and Zero Scale
setup registers and the hardware Port that the output is sent to. Use Designer
software to configure these setup registers in the Analog Output module.
The Zero Scale setup register defines the source input value that creates the
minimum current output on the analog device.
The Full Scale setup register defines the source input value that creates the
maximum current output on the analog device. The Full Scale is determined by the
input to the Analog Output ION module (which is commonly connected to kW).
The Full Scale value is the maximum kW expected.
Analog Output Module
Setup Registers Available Settings Default Description
Port
I/O EXP AnOut 1 to
I/O EXP AnOut 4,
NOT USED
NOT
USED
Specifies the output hardware
channel.
Full Scale
-1 x 10
9
to 1 x 10
9
N/A
Sets the measured value that will
create the maximum possible output
on the analog output hardware port.
Zero Scale
-1 x 10
9
to 1 x 10
9
N/A
Sets the measured value that will
create the minimum possible output
on the analog output hardware port.