5.5 Line Voltage/Current Sensor Diagnostics
The three-phase AC MAINS voltage wiring and the current sensor wiring must be
connected in the proper phase sequence. If there is a phase sequence error, the
Display LCD will display a message “Check
Sensor” in the upper right hand corner.
Additionally, LED D5 labeled “MTR” will
fl ash at a rate of twice per second in the
event of a phase error or missing phase
voltage(s).
Verify 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. a 200 amp meter
requires a 2 amp load for each phase to perform sensor diagnostic procedures.)
Verify 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 the current sensor plugs are terminated in the correct header on the main
power board.
If the error messages still haven’t been cleared, measure the AC voltage output
across the plug terminals of each current sensor individually. Set the AC voltme-
ter to the 20 Volt scale. If a reading of zero is indiciated on the voltmeter, check
for an open circuit. An open circuit could exist at the plug terminals or at a splic-
ing junction. Also verify a tight connection exists between the core halves.
If the error is still appearing, contact E-Mon’s technical support department at
(800) 334-3666 (PA) or (800) 810-3666 (CA) for futher assistance.
Final Main Power Board checks
Once the phase error has been corrected, the display LCD “Check Sensor” error
should extinguish and the main power board LED D5 should fl ash at a rate of
once per second. Also verify LED D4, labeled “CPU” is fl ashing at a rate of once
per second and synchronously with LED D5.
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