1. Cutsforth Support
  2. Shaft Ground Monitoring: Assurance System | Series 1
  3. Operations Manual – Assurance Monitoring System Series 1 – EZDP-2041

Assurance Monitoring System Operation

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With the Assurance Monitoring System, you can view real-time shaft voltage and ground current readings and receive worn rope warnings. You can also access test points for shaft voltage, ground current, and rope wear.

ELECTRICAL DANGER

Only qualified electrical personnel should take measurements at the remote test points. For any of the test points on the faceplate, use a hand-held voltmeter, oscilloscope, clamp-on ammeter, or other appropriate testing device. Always follow proper electrical safety procedures.

A - Ground rope

B - Meter rope (connected to High-Frequency Drain)
2041_7_0.png

Display

The Assurance Monitoring System contains a 5 in touchscreen interface that displays real-time shaft voltage and ground current readings.

2041_7_1_A.png

When the system senses a worn rope, it displays a red REPLACE ROPE alert indicating that it is time to replace the ropes.

2041_7_1_B.png

After replacing ropes

  1. Press RESET ROPE to clear the alert on the system.

  2. Enter the date on which the ropes were replaced by pressing CHANGE DATE.

Shaft Voltage Test Point

The + and - shaft voltage test points connect directly to the following points:

  • + is the isolated meter rope on the shaft.

  • - is case ground.

To read the shaft voltage

Place the positive and negative probes on the Shaft Voltage “+” and “-“ test points, respectively.

The resulting voltage or waveform read at this point represents the shaft voltage at the metering rope location.
Shaft_Voltage_Test_Points.png

Rope Wear Indicator Test Point

The rope wear indicator test points are connected to the rope status circuitry.

To test for rope wear

  1. Set an oscilloscope or digital voltmeter to read DC voltage.

  2. Place the positive and negative probes on the Rope Wear Indicator “+” and “-“ test points, respectively.

    • A reading between 4.8 V and 5.1V DC indicates that the ropes are in good condition and not in need of replacement.

    • A reading of 0 V DC or fluctuating DC voltages below 4.8 V DC indicate that the ropes should be inspected and the worn rope should be replaced.

After replacing ropes

  1. Press RESET ROPE to clear the alert on the system.

  2. Enter the date on which the ropes were replaced by pressing CHANGE DATE.
Rope_WI_Test_Points.png

Ground Current Test Point

The ground current test points are connected to the Hall effect sensor drivers.

To measure current flowing to ground from the shaft

  1. Set an oscilloscope or digital voltmeter to measure in the mV scale. 

  2. Place the positive and negative probes on the Ground Current + and - test points, respectively.

  3. Refer to the following table to interpret that voltage reading as an associated current value.
Ground_Current_Test_Points.png

Meter Reading (V)

Associated Current (A)

0

0

0.03

1

0.06

2

0.15

5

0.30

10
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