H2KH-22-C flender tübingen gmbh Helical speed reduction gearboxes H2

Flender/Flender Gear Units/Helical speed reduction gearboxes H2

ard control . On-off control . Ratio and bias control . Logical operation etc. . The loop reaction / response time (from change of output of the sensor of the transmitter / temperature element to the corresponding ontrol command output) shall be 1 to 2 ms for OLCS and 5 ms for CLCS. However, for faster loops the same shall be based on actu al process requirement. For very fast acting loops like Compressor Governing Control etc., loop time shall be designed to match th fast actuation time of hydraulic control system. . The control system shall be bumplessly transferred to manual on the following conditions as minimum . Control power as minimum. . Failure of redundant controllers. . Field input signal not available . Analog input exceeding preset limit . Any switch over from auto to manu al, manual to auto and vice versa shall be bump less and without resulting in any change in the plant regulations and the same shall be reported to the operator. . Where the equipment are contro lled by group of regulators act ing in parallel, the relative position of individual actuator associat ed with them shall be capable of being adjusted with respect to one ano ther and to the common aut omatic signal. . The drift in the output command to the actuator (both in manual and auto modes) shall be within permi ssible limits to meet th clos loop performance requirements. . Time supervision facility shall be provided to monitor the fina control element. 1 of 1 INDRADHANUSH GAS GRID LIMITED TECHNICAL SPECIFICATION FOR NATURAL GAS COMPRESSOR STATION FOR NORTH EAST GAS GRID PIPELINE PROJECT TS NO.: MEC//2UU/0/2/0 Control & Instru mentation (&) Chapter-0.0 2, MECON Limited, All Right Reserved Page 8 of 1 . It shall be possible to block the controller output on pre-pr ogrammed basis or on operator demand. . All controllers shall be freely configurable with respect to re quisite control algorithms and c