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|Troubleshooting the VR 7671 (Neptune 35HR)|
Neptune resells a Veeder-Root
7671 solid state pulse transmitter as their solid state pulser with the
suffix "HR". They leave the Veeder-Root name and model number
on the pulser.
The pulser is the aluminum housing with the screw cover. This cover is normally tight, but it will unscrew.
The wiring should be:
Red ..... to the supplied DC power from the receiver. MiniTrol term #7
White .. to the -DC, or Ground, side of the receiver. MiniTrol term #8
Black ... to the signal input. MiniTrol term #5 (or #6 for Channel 2)
Uncover the wires so that you can measure DC voltages.
Between red and white, you should measure the supplied voltage.
(MiniTrol is 18.5 VDC)
Remove the three screws holding the pulser and pull it off to one side.
Connect the DC voltmeter to measure between black(+) and white(-). By turning the shaft slowly, you should see a voltage pulse in the area of 17 VDC. There are 100 pulses per revolution and you must turn the shaft slowly to actually measure the individual pulses. The voltage should drop to zero in between pulses. If you don't see pulses, you've got a burned out pulse transmitter.
If you cannot easily uncover the wires, you can perform these same tests at the receiver terminal strip. However, you should ensure that the wires are not broken.
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