WOODWARD CONTROL
WOODWARD PG-PL-29 8577-613 Governor
This manual describes the installation, operation, adjustment, and maintenance for the PG-PL governor. The PG-PL governor is a basic PG governor (pressure compensated governor) with a pneumatic speed setting mechanism (direct or reverse) and a short column that is used primarily for controlling engine or turbine speed. This PG governor was first used on pipelines, hence the PL, but has since found wide acceptance on all types of diesel engines, gas engines, steam turbines driving pumps and compressors, and many special applications. The PG-PL governor includes a pneumatic speed setting mechanism, standard short column, standard base assembly, and 12 ft-lb (16 J) power cylinder assembly. All PG governors have the same basic components regardless of how simple or complex the complete control may be. The following components, found in each PG-PL governor, are sufficient to enable the governor to maintain a constant engine speed as long as the load does not exceed engine capacity: an oil pump, storage area for oil under pressure, and a relief valve by which maximum oil pressure may be limited a centrifugal flyweight head-pilot valve assembly which controls flow of oil to and from the governor power cylinder assembly a power cylinder assembly—sometimes referred to as a servomotor—which positions the fuel racks, fuel valve, or steam valve of the engine or turbine a compensating system for stability of the governed system a pneumatic speed setting mechanism for adjusting the governor speed setting
An air pressure signal from a pneumatic air transmitter or controller supplies air to the governor speed-setting mechanism. The governor controls the engine at a definite speed for each air pressure. Direct or reverse, with 3 psi (21 kPa) minimum and 100 psi (690 kPa) maximum control air pressure, the ratio of high air control signal must be greater than 2.5 to 1, but less than 10 to 1. Typical pneumatic ranges are 3 to 15 psi (21 to 103 kPa) and 10 to 60 psi (69 to 414 kPa). The governor speed range normally falls between 250 and 1000 rpm, but a low speed of 200 rpm or a high speed of 1600 rpm can be obtained. Contact Woodward for recommended control air pressure to governor speed-setting relationship to meet the requirements of the particular installation. The pneumatic speed setting mechanism (direct or reverse) is a bellows-type mechanism and is standard equipment on all PG-PL governors now manufactured by Woodward. The speed setting unit is an accurate, durable mechanism which virtually eliminates the hysteresis loops encountered with less sensitive pneumatic speed setting elements. (A hysteresis loop is a plot of the speeds obtained at various control signal pressures—one portion is recorded as speed setting signals are being increased, the other portion as the signals are being decreased.) Bellows-type speed setting provides a definite, accurate relationship between speed and speed set point signal. The speed setting mechanism is available for use with air input signals of varying range and magnitude [such as 3 to 15 psi (21 to 103 kPa), 20 to 70 psi (138 to 483 kPa), etc.]. Depending on the exact configuration installed in the governor, speeds may be adjusted up to a 5-to-1 range. The speed-setting mechanism can be furnished to increase governor speed setting for an increase in control air pressure (direct type) or to increase governor speed setting for a decrease in control air pressure (reverse type). The manual speed setting knob permits manual operation when the air pressure signal is not available. This also raises the pneumatic signal range. Normally, the manual speed setting knob must be set at minimum on direct speed-setting governors to ensure that the pneumatic signal range is correct. On reverse speed-setting governors, the manual speed-setting knob must be set at maximum
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Replacing an electrical equipment unit in a plant is a complex task that requires careful planning and execution to ensure safety and minimize downtime. Here is a general step-by-step guide on how to replace electrical equipment in a plant:
Pre-Planning:
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Disconnection:
Removal of Existing Equipment:
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Testing and Commissioning:
Documentation:
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Throughout the process, it’s important to work closely with a team that includes electrical engineers, technicians, and maintenance staff. Communication is key to a successful equipment replacement. Additionally, always adhere to local electrical codes and standards to ensure compliance and safety. If the task is beyond the expertise of in-house staff, consider hiring a professional contractor experienced in industrial electrical work.
Obtaining industrial automation programming software typically involves the following steps:
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Remember to keep your software updated to benefit from the latest features and security patches. Also, ensure that you have the necessary backup and recovery procedures in place to protect your programming work.
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