GREEN CLASS METER
10
62-0340-01
Line Voltage/Current Sensor Diagnostics
The three-phase AC MAINS voltage wiring and the current
sensor wiring must be connected in the proper phase se-
quence. If there is a phase sequence error, the display LCD
will display a message ‘Check Sensor” in the upper right
hand corner. Additionally, LED D1, Check Sensor, will illumi-
nate if there is a phasing error.
Verify that the AC MAINS voltage wires are all connected
to the correct positions on terminal block TB1. Inspect the
MAINS input wiring to verify each conductor is terminated at
the correct terminal block position. Using an AC voltmeter,
measure the AC voltage for each Phase to Neutral terminal
and to the Frame ground point.
Verify each current sensor by running at least 1% of the full
scale rated current through the conductor being monitored
by each phase. (e.g. 2 amp load required for each phase to
perform sensor diagnostic procedures.)
• Verify that the current sensor white and black conductors
are installed in the correct header positions.
• Verify the current sensors are installed in the correct
direction on the conductor being monitored.
• Verify that the current sensor plugs are terminated in
the correct header on the Main power board if meter is
equipped with removable ST terminal blocks.
If the error messages still haven’t been cleared, measure the
AC voltage inputs across the plug terminals of each current
sensor, individually. Set the AC voltmeter to the 20 Volt scale.
If a reading of zero volts is indicated on the voltmeter, check
for an open circuit. An open connection could exist at the
plug terminals or at a splicing junction. Also verify a tight con-
nection exists between the core halves.
Main Board ST Config. Shown
D5 (meter power)
D1
Final Main Board Checks
Once the phase error has been corrected, the Display LCD
“Check Sensor” error should extinguish and the Main Power
Board LED D1 should extinguish.
MONITORING MULTIPLE
LOADS WITH ONE METER
The Class 200 meter provides extreme flexibility by allowing
additional sets of current sensors to be used in parallel so
that multiple load locations can be monitored by one meter.
This feature allows a totalized display readout from two or
more load circuits.
You may use parallel sensors to monitor specific breakers
from one panel, specific breakers from more than one panel,
two or more complete panels, etc.
When paralleling current sensors, the following rules must be
followed for accurate readings:
1.
Current sensors must be installed in complete sets of
three, with a maximum of three sensors installed in
parallel per phase.
2.
All sensors used in parallel must be of the same am-
perage rating (i.e. 100 amp, 200 amp, etc.). The rating
is determined by the current rating (amperage) of the
Class 200 meter. For example, a 200 amp meter
must use extra sets of 200 amp current sensors.
3.
All locations being monitored must have the same pow-
er source. A 480 volt meter cannot monitor a 208 volt
load nor can a meter monitor two 480 or 208 volt loads
if they are from different originating power sources or
from different transformers.
4.
The display readings must be multiplied by the number
of sets of current sensors installed. E.g. meter reading
of 5 kWh with 2 sets of current sensors....5 x 2 = 10
kWh (actual usage.)
NOTE: One set of current sensors equates to three sen-
sors, one per phase. The multiplier only applies
when extra sets of current sensors are installed on
one meter. Therefore, if you are using only one set
of three sensors (one per phase) the multiplier is not
required.
Summary of Contents for Green Class meter
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