Issue
TAC EM 5 Actuator requires replacement.
Product Line
Field Devices
Environment
- EM 5 EM5C EM5
- Actuator
Cause
TAC EM 5 Actuator requires replacement
Resolution
The TAC EM5 Actuator is totally obsolete and no direct replacement is currently available.
Details of the TAC EM5 Actuator can be found in EM5 OBSOLETE.tmp.pdf.
The TAC EM5 Actuator was capable of use in control systems having alternative electrical wiring connections.
Alternative 1
Actuator electrical connections comprising 24 Vac power supply and 2-10 Vdc / 4-20 mA DC positioning signal. In instances where the positioning signal is 2-10 Vdc, the TAC EM5 Actuator may be replaced by the S-E MD10A-24. Details of the S-E MD10A-24 Actuator may be viewed in MD10A S-E.pdf.
N.B.
The S-E MD10A-24 should be checked for electrical compatibility with other control system devices that it is to be integrated with. It is unlikely that it will be mechanically compatible with the other control system devices such as the Control Valve Body. Arrangements may therefore need to be made for the design and manufacture of a suitable Linkage Kit.
Alternative 2
Actuator electrical connections comprising 24 Vac power supply and 2-10 Vdc / 4-20 mA positioning signal with 16 Vdc output. In instances where the positioning signal is 2-10 Vdc, the TAC EM5 Actuator may be replaced by the S-E MD10A-24.
It should be noted however that no 16 Vdc output is available from the S-E MD10A-24 and none can be connected. A 16 Vdc power supply should therefore be installed to provide power to any external Controllers or Auxiliary Units.
