SR745-W2-P5-G5-HI Universal GE Motor Protection Device

Description

The curves can take one of three formats: standard, custom, or voltage dependent. For all curve styles, the 469 retains thermal memory in a thermal capacity used register which is updated every 0.1 second. The overload pickup determines where the running overload curve begins. The 469 standard overload curves are of standard shape with a multiplier value of 1 to 15.

The voltage dependent overload curves are used in high inertia load applications, where motor acceleration time can actually exceed the safe stall time and motor thermal limits. During motor acceleration, the programmed thermal overload curve is dynamically adjusted with reference to the system voltage level. The selection of the overload curve type and the shape is based on motor thermal limit curves provided by motor vendor.

To ensure the operational quality of the DCS system, the instrument signals input to the system must be accurate and accurate. Therefore, during installation, it is necessary to strictly follow the requirements of GBJ93-96 “Automatic Control Installation Atlas” and the instrument user manual for correct installation. The requirements for the installation and use of instruments are as follows:
1、 Pressure transmitter
1. The pressure and negative pressure measuring device should not be installed on the straight direction pipeline of the flow beam, and should not be installed in places where the bending, corner, dead corner, and vortex of the flow beam are sufficient to cause distortion of the static pressure head.
When installing pressure or negative pressure measuring devices, the pressure measuring pipe should not extend into the interior of the fluid pipeline or equipment due to being perpendicular to the flow beam. The pressure measuring port should have a smooth outer edge and should not have sharp edges. Continuous use of conduits and accessories should be neatly cut and burrs removed.
3. The installation position of pressure pipes on horizontal and inclined pipelines should be at the upper part of the pipeline when the fluid is gas.
When the fluid is liquid, it is within an angle range of 0-450 between the lower half of the pipeline and the horizontal centerline or on the centerline of the pipeline.
When the fluid is steam, it is within an angle range of 0-450 between the upper half of the pipeline and the horizontal centerline or on the pipeline centerline.
4. All pressure tapping devices must be equipped with a primary door, which should be close to the pressure tapping device.
5. The horizontal section connecting the impulse pipeline should maintain a certain slope, and the inclined direction should ensure the discharge of air or condensed water. The pipeline slope requirement is that the pressure pulse pipeline should not be less than 1:100. The pressure pulse pipeline should be equipped with a drain valve at the pressure gauge to flush the pipeline and exhaust air.
6. Before installation, the pressure pulse pipeline should be purged to ensure cleanliness and smoothness inside the pipeline. The valves on the pipeline should undergo a tightness test before installation, and after the pipeline is laid, another tightness test should be conducted. Before driving, the pressure pulse pipeline should be filled with water (note that bubbles are not allowed to enter during water filling and affect measurement).
7. For the installation of smart transmitters, please refer to the installation and operation manual of the random transmitter.

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