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MN01047
Issue/Rev. 0.0 (10/18)
To ensure proper operation of the HRE and to avoid
damage to the circuitry, check to make sure that all S1
dip switches are locked in the “OFF” position (opposite
of the ON position and closest to the numbers on the
dip switch (see Figure 5).
There are 3 LEDs on the HRE. The 2 LED’s next to each
other indicate if there is an issue with the distance posi-
tion between the magnet and the sensor that is located
on the backside of the HRE board. Both lights on indi-
cates magnet is too far away. Only red on indicates the
magnitude of the magnetic field is increasing. Only the
green on indicates the magnitude of the magnetic field
is decreasing. The 3
rd
LED (D14) is a diagnostic tool. It
will blink a certain sequence to help diagnose any prob-
lems (Figure 6). Reference Table 3 for sequence code.
Table 3 identifies the detectable firmware fault conditions,
hardware fault conditions and notable status conditions
that may exist. Table 3 also identifies the condition,
whether or not pulses will come out of the HRE and
how the LED (D14 on HRE board assembly) will indicate
the condition.
Section II – HRE Diagnostics
Remove the Junction Box Cover (Figure 3). Refer to
Table 2 for HRE status check and troubleshooting prior
to replacement. To determine the HRE status, the board
must be powered.
Caution: Disconnect power (12 Vdc) before working
on the meter or replacing the HRE board.
Terminal 1
+ 10 to + 30 Vdc
Terminal 2
“A” Signal (Leading)
Terminal 3
“B” Signal (Lagging)
Terminal 4
Logic Common (Ground)
Terminal 5
No electrical connection on
circuit board. These can be used
for wiring connections or tie-ins
(ex. RTD junction, etc.).
Terminal 6
Terminal 7
Terminal 8
Figure 3 – Remove Junction Box Cover
Figure 4 – HRE
Table 2 – Terminal Block
Figure 6 – HRE Diagnostics
Figure 5 – HRE Dip Switches
Terminal Block
Junction Box Cover
Pulse A and B LED
LED (D14)
