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      A6220

      Shaft Eccentricity Monitor
      Ships by Wednesday, November 11
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Emerson A6220 is a dual-channel shaft-eccentricity monitor for non-contact displacement inputs. It measures shaft bow at slow rotation and compares the configured characteristic values with alert and danger limits.
      • Manufacturer part number
        A6220
      • Shipping
        Swift global dispatch
      • Condition
        New, original product
      • Shipping size (est.)
        3cm x 19cm x 12.8cm
      • Country of Origin
        USA

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      What happens after you enquire

      • 0

        Review your reference

        Send the complete Emerson A6220 reference, label photographs and required quantity. Include the displacement-chain and key-monitor configuration.

      • 1

        Confirm the offer

        Review the offered revision, condition, included items and documents against the confirmed installation.

      • 2

        Arrange dispatch

        Confirm quantity, dispatch date, lead-time start and delivery details in the quotation.

      • Match the complete marking

        Match the complete Emerson A6220 marking and the installed configuration. Compare channel sensitivity, eccentricity range and backplane interfaces.

      • Check the offered item before ordering

        Please request clear photographs of Emerson A6220, including its complete label and interfaces. Ask your maintenance team to compare the offered unit with the installed equipment and the applicable Emerson A6220 technical specifications before approving the order.

      Technical specifications for A6220

      • Manufacturer:
        Emerson
      • Product Category:
        Machinery Monitoring Systems
      • Spare Part Number:
        A6220
      • Weight:
        0.3 kg
      • Tariff Code:
        8537101190
      • Input channels:
        2 independent differential inputs
      • Input resistance:
        >100 kΩ
      • Measurement modes:
        Peak-to-peak; min/max; continuous gap
      • Signal range:
        0–400 mV peak minimum; 0–8000 mV peak maximum
      • Sensor supply:
        Nominal -26.7 VDC
      • Sensor current:
        20 mA nominal; 35 mA maximum
      • Current output:
        0/4–20 mA per channel; load <500 Ω
      • Current-output accuracy:
        ±1% of full scale
      • Voltage output:
        0–10 VDC per channel; load >10 kΩ
      • Output settling time:
        Configurable 0–10 s
      • Limit multiplier:
        1.00–4.99
      • Operating temperature:
        0 to +65 °C
      View as PDF Ask for Quote

      Information

      Overview Downloads Applications / Compatibility Product Precautions
      • Emerson A6220 follows the eccentricity collar near a machine thrust bearing during slow roll. Its two independent channels separate the displacement measurement from the alarm and output functions used by the machinery-protection system.
      Input channels: Two independent differential eddy-current inputs
      Measurement modes: Peak-to-peak, min/max and continuous gap
      Proportional outputs: 0/4–20 mA and 0–10 V per channel
      The monitor accepts eddy-current measuring chains using 6422, 6423, 6424 or 6425 sensors with appropriate CON drivers and key monitoring. A displacement sensor views the eccentricity collar through the bearing case or from an internal mounting. Shaft bow assessment is intended for slow rotation below 600 rpm.

      Measurement range, engineering units and sensor sensitivity are configurable. Peak-to-peak, minimum/maximum and continuous-gap measurements are available, with a 60-second settling period for hot configuration. Buffered sensor signals are available separately from the proportional current, voltage and gap outputs.

      Each channel has independent OK indication and alert/danger indication. Alarm limits are adjustable from 5 to 100% of full scale with 1% resolution; normal alarm delay is 0–5 seconds. Power, sensor, cable, overload, internal temperature and watchdog supervision support fault identification, while remote limit multiplication and trip bypass require controlled configuration.
      Controller platform reference: A6220 eccentricity measurement. Match the probe driver, key reference and alarm configuration.
      Technical material for Emerson A6220 covers channel architecture, configurable measurement modes and alarm/output limits. The separate installation guide covers sensor-chain readiness, output loading, configuration settling and alarm tests.
      Both downloads are Apter Power-authored references based on manufacturer technical information; neither is a manufacturer-issued manual.
      System and supply context: Use A6220 with the matching displacement sensor, CON driver and key-monitoring arrangement in its approved machine-monitoring rack. Field transducers and relay hardware are separate system components.

      Application scope: Eccentricity monitoring supports slow-roll assessment of large sleeve-bearing machines. Shaft-bow interpretation requires the intended collar geometry and low-speed operating condition.
      Prepare Emerson A6220 for its configured installation using these checks.
      Keep the collar geometry

      Match sensor position and target collar to the installed eccentricity measurement.

      Retain sensitivity

      Use the correct probe/driver sensitivity and engineering-unit scaling.

      Allow configuration settling

      Account for the 60-second hot-configuration settling time before judging the measured value.

      Match output loading

      Keep current-loop load below 500 Ω and voltage-output load above 10 kΩ.

      Control bypass states

      Record the limit multiplier and trip-bypass state and restore them after testing.

      Verify channel health

      Investigate sensor, cable or supply faults before accepting a normal-looking proportional output.

      Alternative Names

      Emerson A6220

      Technical notes

      Signal relationship: The sensor must view a suitable eccentricity collar for shaft-bow monitoring. A buffered raw-signal path is separate from the peak-to-peak or gap characteristic value used by proportional outputs and alarms.

      Installation boundary: Test normal alarms, channel-not-OK response and the removal of any trip bypass independently. A proportional output agreeing with the display alone does not verify the shutdown path.

      Technical basis: Emerson Protection Cards for AMS 6500 Classic Systems, A6220 specifications, November 2017. Values apply to the A6220 eccentricity-monitor design with a configured displacement measuring chain. Buffered bandwidth does not define the slow-roll eccentricity application range.

      FAQ View All FAQ

      • Why is A6220 used during slow roll rather than only at rated speed?
        Eccentricity monitoring detects shaft bow using non-contact displacement at a collar below 600 rpm. This slow-roll condition separates the intended bow assessment from normal operating vibration.
      • Which measurements can A6220 derive from the displacement signal?
        It supports peak-to-peak, minimum/maximum and continuous-gap measurements. Measurement range, engineering units and sensor sensitivity are configurable.
      • Does the buffered output of A6220 represent the same quantity as its current output?
        No. The buffered output carries the raw transducer signal, while 0/4–20 mA is proportional to the configured main characteristic value. Use the correct signal for the test.
      • How long should A6220 be allowed to settle after hot configuration?
        The specified measurement-mode settling time is 60 seconds. Its proportional-output settling setting is a separate configurable 0–10 second value.
      • What current-loop burden is permitted on A6220?
        The load must be below 500 Ω for the 0/4–20 mA output. Accuracy is ±1% of full scale under the applicable operating conditions.
      • How finely can alert and danger thresholds be adjusted on A6220?
        The adjustment range is 5–100% of full scale with 1% resolution. Alarm delay is 0–5 seconds per channel; extended delay through an A6740 relay card is a separate system feature.
      • What does a flashing green indication on A6220 mean during the delay period?
        The green OK LED flashes during the delay period and goes off for a not-OK state. The cause can be read through the communication bus; examine the fault before accepting the channel.
      • How should the remote limit multiplier on A6220 be checked?
        Verify the selected multiplier in the 1.00–4.99 range and exercise the remote relay input under a controlled test. Restore the approved normal multiplier and remove temporary trip bypass before release.
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