5.1
Multiplier (CT Ratio or CT x PT Ratio) (Con't)
Determine the multiplier of the facility's electric meter. If the meter is a self-contained meter (no external current
transformers), the multiplier is 1. The default external multiplier in the MPG-2ES is one (1), so you can skip this step. If the
utility's Zigbee transmission to the dongle includes the correct CT/PT multiplier value
(primary
value), you can skip this step
also. This is very rare on instrument-rated metering implementations however, since most utilities do not want to program
the multiplier into the meter due to conflicts with the billing process. If you are looking at the serial data received from the
meter, you will be able to see what internal multiplier is being sent in every transmission. This will be in hexadecimal format.
What you're looking for is whether this is 1 or something else besides 1. If, for instance, the multiplier is a decimal 160, it will
be transmitted by the meter to the dongle as a hexidecimal "A0". If the multiplier
is
one (1), (and this is the standard) AND
you know
that that the meter's external multiplier is something other than 1, you will have to program the correct external
multiplier into the MPG-2ES so that the true energy value, and thus the kW demand, is correct.
To change the multiplier in the MPG-2ES, enter the correct multiplier in the
Meter Multiplier
field. If you are done entering
information you can press the <Send> box and the multiplier will be sent to the MPG-2ES and will show correctly now in the
Meter Multipler field.
The USB serial link will return the current multiplier stored in the MPG-2ES, along with all other system settings. The
maximum multiplier is 99999 and must be an integer (whole) number.
5.2
Programming the Output Pulse Value
The output pulse value is the number of Watt-hours that each pulse is worth. This is represented by the
Pulse Value
field.
The MPG-2ES can be set from 1 Wh to 99999 Wh per pulse. Select a pulse value that you think will be appropriate for your
application. A good starting point is 100 wh/pulse. You can adjust it up or down as needed. Larger facilities will require a
larger pulse value to keep from overranging the MPG-2ES's registers or the maximum number of output pulses per second.
Enter 100 in the Pulse Value field and press <Send> to set the Output Pulse Value at 100 wh/pulse. The Pulse Value on the
SSI-UP will now show the correct value:
----------------------------------------
Pulse Value: 100 Watt-hours
----------------------------------------
5.3
Set Output Mode
For one-direction operation, set the MPG-2ES's Output Mode to
Normal
mode (kWh delivered). Set the MPG-2ES's mode
to the
Signed
mode (kWh delivered or received) if desired for a distributed energy resource(DER) application such as solar
or wind. In the Normal mode, only positive energy is recorded and positive pulses generated. Negative energy is ignored. In
the Signed mode, bidirectional energy, positive and negative, are separately recorded and positive pulses generated.
However, because the MPG-2ES only has one output, negative energy pulses are not available, so Signed mode and
Normal mode are effectively the same. Use the Output Mode field to select desired mode. The Normal mode is the default.
For Normal Mode:
Set the mode field to Normal and press <Send> to set the Output Mode to Normal Mode. The serial link to the MPG-2ES will
return:
----------------------------------------
Normal
----------------------------------------
For Signed Mode:
Set the mode field to Signed and press <Send> to set the Output Mode to Signed Mode. The serial link to the MPG-2ES will
return:
----------------------------------------
Signed
----------------------------------------
5.4
Set the Pulse Output Form
The MPG-2ES has two output forms, the 3-Wire (Form
C
)
Toggle
mode or the 2-Wire (Form
A
)
Fixed
mode. Set the Toggle
mode by selecting
C
in the Output Form field from the pull-down menu. The toggle mode is the classic pulse output mode
that emulates the standard KYZ 3-Wire electric meter output. It toggles back and forth, to the opposite state, each time a
"pulse" is generated by the MPG-2ES. Even though there are three wires, it is common to use K and Y, or K and Z, for many
two-wire systems that require or desire a generally symmetrical 50/50 duty cycle pulse. The toggle mode is used for systems
that are doing demand control and need regularly spaced "symmetrical" pulses. The 3-Wire pulse value must be doubled if
your pulse receiving device uses only two wires AND is only counting the closure as a pulse (not the subsequent contact
opening also). See additional information on Page 9.
MPG-2ES Wireless Meter Pulse Generator
