In conventional actuators, the reversing contactors are provided externally i.e. in Motor Control Centre (MCC). But this leads to increased wiring & hassles during commissioning. Actuators can be provided with Integral Controls, which consists of the following: |
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Starters / Reversing Contactors (Electro-Mechanically Interlocked) |
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Selector Switch (Local-Off-Remote) with padlock |
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Local Push Buttons (Open-Stop-Close) |
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Step-down Transformer |
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With integral starter actuator, the following additional safety / protection features can be provided : |
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Thermal Overload Relay |
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Single Phasing Protection |
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Automatic Phase Correction |
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Electronic (Solid-State) Starter |
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The advantages of “Integral Controls” : |
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All the safety / motor protection features of actuators (e.g. Limit & Torque Switches, Thermo-Switches, Thermal Overload Relay, Single Phasing Protection, Automatic Phase Correction etc.) are internally wired / connected. This ensures total safety of the actuator. |
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There is no susceptibility to the mistakes made during field cabling. |
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The field wiring is substantially reduced, which results in cost saving. |
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It is possible to operate the valve locally, which is an important function during commissioning and on-site repairs / servicing. |
