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      A6370D

      Overspeed Protection Monitor
      Ships by Thursday, November 12
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Emerson A6370D is a display-equipped overspeed protection monitor used as one of three independent measurement channels in an AMS 6300 SIS system. It accepts a configured speed-sensor signal and provides current, pulse and binary interfaces.
      • Manufacturer part number
        A6370D
      • Shipping
        Swift global dispatch
      • Condition
        New, original product
      • Shipping size (est.)
        19cm x 12.8cm x 7cm
      • Country of Origin
        USA

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      What happens after you enquire

      • 0

        Review your reference

        Send the complete Emerson A6370D reference, label photographs and required quantity. Include monitor revisions, sensor type and backplane version.

      • 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 A6370D marking and the installed configuration. Confirm all three monitor variants and their hardware/firmware relationship.

      • Check the offered item before ordering

        Please request clear photographs of Emerson A6370D, including its complete label and interfaces. Ask your maintenance team to compare the offered unit with the installed equipment and the applicable Emerson AMS 6300 SIS operating manual before approving the order.

      Technical specifications for A6370D

      • Manufacturer:
        Emerson
      • Product Category:
        Machinery Monitoring Systems
      • Spare Part Number:
        A6370D
      • Weight:
        0.24 kg
      • Tariff Code:
        8537101190
      • Monitor channels:
        One sensor input per monitor; three monitors per system
      • Current outputs:
        Two; 0/4–20 mA or 20–4/0 mA
      • Current-output burden:
        Maximum 500 Ω
      • Current-output accuracy:
        ≤1% of measuring range
      • Isolated pulse outputs:
        Three per monitor; 0–20 kHz
      • Pulse-output limits:
        31.2 V maximum; 16 mA at 24 V
      • Front TTL output:
        0–5 V; 0–20 kHz
      • Binary inputs:
        Four; low 0–5 V, high 13–31.2 V
      • Binary outputs:
        Seven; maximum 25 mA
      • Configuration interface:
        USB 2.0 Type B
      • System supply:
        19–31.2 VDC; nominal 24 VDC
      • Ambient temperature:
        -20 to +55 °C unforced; up to +65 °C with forced cooling
      View as PDF Ask for Quote

      Information

      Overview Downloads Applications / Compatibility Product Precautions
      • Emerson A6370D compares shaft-speed information with configured protection functions while its front display and indicators support local observation. Three monitors work with the selected A6371 backplane; the backplane version determines how the trip outputs reach the external protection circuit.
      Architecture: Three independent monitors per AMS 6300 SIS assembly
      Interfaces: Two current outputs and three isolated pulse outputs per monitor
      Configuration: USB 2.0 Type B; front display and status LEDs
      A6370D is the display-equipped version. The A6370D/DP variant adds PROFIBUS DP and must not be treated as an identical communication option. One system uses the same monitor type across all three positions; the exact hardware and firmware revisions must remain compatible with the installed AMS 6300 SIS configuration.

      Each monitor has two isolated current outputs with common ground, selectable as 0/4–20 mA or 20–4/0 mA. The maximum burden is 500 Ω. Three isolated open-collector pulse outputs operate up to 20 kHz, while the front TTL point provides a separate 0–5 V diagnostic signal. The front sensor buffer is unavailable when a variable-reluctance sensor is connected.

      The installed system operates from 19 to 31.2 VDC and requires a supply with at least 30 W capability. The permitted ambient range is -20 to +55 °C without forced cooling or -20 to +65 °C with forced cooling. Protection functions, proof testing and voting must be assessed as part of the complete safety installation rather than assigned to a loose card alone.
      Controller platform reference: AMS 6300 SIS. Match monitor type, backplane voting and approved protection settings.
      Technical material for Emerson A6370D covers monitor identity, sensor inputs, output interfaces and operating limits. The separate installation guide covers channel identification, sensor matching, current-loop tests, protection inputs and trip-path verification.
      Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
      System and supply context: Use three compatible A6370D monitors with the intended A6371 backplane and approved speed-sensor circuits. Backplane, sensors and external trip hardware are separate assembly items.

      Application scope: Configured overspeed, rotational-direction and function outputs belong to a complete machinery protection design with controlled testing and reset procedures.
      Prepare Emerson A6370D for its configured installation using these checks.
      Match monitor type

      Keep the three monitor positions consistent; do not mix D and D/DP variants.

      Verify sensor selection

      Match eddy-current, Hall or VR configuration to the connected signal and its permissible input range.

      Check current receivers

      Allow no more than 500 Ω burden and verify the selected normal and error-current interpretation.

      Maintain cooling

      Use the lower +55 °C upper limit unless the required forced cooling is provided.

      Control test inputs

      Use Test value, Enable and Reset inputs only under the approved protection-test procedure.

      Verify trip architecture

      Check the installed backplane and external voting logic before releasing the system.

      Alternative Names

      Emerson A6370D A6370 D

      Technical notes

      Signal relationship: The front TTL and isolated open-collector outputs have different electrical interfaces. Front Sens. is a scaled sensor signal and provides no output for a connected VR pickup.

      Installation boundary: Life Zero current suppression is available in 4–20 mA or 20–4 mA modes: system errors drive the selected current output to 0 mA. This must agree with the receiving system error interpretation.

      Technical basis: Emerson AMS 6300 SIS Operating Manual, MHM-97442 Rev. 2.09, October 2026. Ratings describe A6370D within the complete AMS 6300 SIS assembly; DP communication belongs only to the separately identified DP version.

      FAQ View All FAQ

      • Does A6370D include PROFIBUS DP communication?
        No. A6370D is the display version; A6370D/DP is the separately identified PROFIBUS DP version.
      • Why can the front Sens. socket of A6370D remain without a signal?
        The sensor-buffer output is not provided when a VR sensor is connected. This is distinct from the front TTL pulse output.
      • How many current loops can A6370D supply?
        Two electrically isolated outputs share a common ground. Each has a maximum 500 Ω burden and selectable ascending or descending current range.
      • What does a 0 mA signal mean when A6370D uses Life Zero?
        With Life Zero selected in a 4–20 mA or 20–4 mA mode, a system error suppresses the output to 0 mA. The receiving controller must distinguish this from the normal scaled range.
      • Can A6370D operate at +65 °C without forced cooling?
        No. The current operating boundary is +55 °C without forced cooling; +65 °C requires forced cooling.
      • Are the isolated pulse outputs of A6370D electrically identical to its TTL socket?
        No. The three isolated outputs use open-collector optocouplers, with a maximum 31.2 V switching voltage and 16 mA at 24 V. The front TTL output is a separate 0–5 V interface.
      • Which input levels activate the binary controls on A6370D?
        The four binary inputs recognize 0–5 V as low and 13–31.2 V as high. Their typical input resistance is 6.8 kΩ.
      • Can one A6370D establish the complete system trip-voting behavior?
        No. Three monitors and the selected A6371 backplane form the system. A6371/00 and A6371/10 have different trip-output arrangements, and external protection logic must match the installed arrangement.
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