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analog position feedback signal from a tec2000 actuator ?

we had recently received a tec2000 actuator, which we connected to our control system . The wiring as done was per the wiring diagram provided in the separate terminal chamber( STC ) that is terminals 25 and 26 for analog control set point (AI) and 27 and 28 for analog position feedback (AO).

we are using a 2 wire loop powered wiring. the analog input which is the control signal is working perfectly fine and the valve moving to the desired position however we cant obtain the position position feedback in our HMI screen.On further diagnostics using a loop calibrator we could establish there was no milliamps output from the terminals (27 and 28) inspite of the valve position receiving the required voltage (24v).
It will be great if anyone could shed some light on this matter and tell me if i am overlooking something here .  
Thanks a lot
alan thomas
  • Nelson
    Alan, Can you provide me with the s/n of the unit so that I can view the wire diagram.

    Nelson Zepeda | Service Manager | Valve Automation
    Emerson Process Management | 13840 Pike Road | Missouri City | TX | 77489 | USA
    T + 1  281-403-4136 | M + 1 281-546-3827

  • Nelson
    The terminal numbers you mention indicate this has an ACM Futronic. The analog output loop in TEC 2000 with ACM Futronic must be powered through terminal #31 and terminals #28 (or #30 if AO2 is used). See the TEC 2000 IOM chapter 4 page 3-10 or TEC 2000 E & C manual.

    Nelson Zepeda | Service Manager | Valve Automation
    Emerson Process Management | 13840 Pike Road | Missouri City | TX | 77489 | USA
    T + 1  281-403-4136 | M + 1 281-546-3827

  • alan thomas

    In reply to Nelson:

    Thanks a lot for the prompt response.I would like to confirm we are using a ACM module having one AI and two AO (position and torque feedback) terminals. The serial numbers of the Emerson actuators are S/N: 137281A202 and 137281A201.

    This clarification might be quite silly. However, we want to avoid any damage to the electronics on this actuator . Like i have mentioned earlier we are using a 2 wire loop powered wiring architecture therefore is it safe to give this additional external power through terminals #31 and # 28 as per your previous reply or do we have change to a 3 wire architecture (power through terminals #31 and #28 and feedback signal through terminals #27 and #28 ) which is going to be a big hassle.

    Thanks a lot once a again.
  • Nelson

    In reply to alan thomas:

    The referenced serial numbers have a spec sheet sheet indicating the actuator was supplied with ACM Network module with Cam 205. This would be suitable for the two wire connection. It also means that you have two analog inputs and one analog output. The description one analog input and two analog outputs matches the description for ACM Futronic. The ACM Futronic requires the three wire connection. Only ACM Network Module allows for two wire Loop Powered Input and Output. Rev K is the current ACM Network Module revision and has been so since 2007.
    If the actuator you have, was converted to ACM Futronic after shipment from our plant, then you must use the three wire connection as described previously or in the TEC 2000 IOM.
    If it was converted to ACM Futronic, then changing back to ACM Network Module to allow for theater wire analog output loop powered connection requires a hardware change and a change in the a Factory Configuration Setup. Parts and Service is required to convert to ACM Network Module.

    Nelson Zepeda | Service Manager | Valve Automation
    Emerson Process Management | 13840 Pike Road | Missouri City | TX | 77489 | USA
    T + 1  281-403-4136 | M + 1 281-546-3827

  • alan thomas

    In reply to Nelson:

    thanks a lot for your support, much appreciated.
  • Rachelle McWright

    In reply to alan thomas:

    We appreciate you using the EE365 Community--your conversation is an excellent example of very efficient problem solving and will live on in the community to help others who may have similar questions. Thanks again, and @nelson zepeda. :)

    Best Regards,

    Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast

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