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Description
2301A 9907-018 2301A series of load sharing and speed controls
Introduction
The speed and load sharing section of these 2301A models monitors and controls two functions.
Speed—The speed control section keeps the prime mover at the correct speed.
Load Sharing—During parallel operation of two or more generators, the load sharing section senses the load carried by its generator and causes the
loads of all generators in the system to be shared proportionally.
Speed Control
The Speed Control system as shown in Figure 4-1 consists of:
a device (1) to sense the speed of the prime mover
a Frequency to Voltage Converter (2)
a Speed Reference (3) to which the prime mover speed can be compared
A Speed Summer/Amplifier (4) with an output proportional to the amount of
fuel or steam required to maintain the desired speed at any given load
An Actuator (5) to position the fuel or steam mechanism of the prime mover
9907-018
A speed-sensing device, such as a magnetic pickup, senses the speed of the
prime mover, and converts it to an ac signal with a frequency proportional to
prime-mover speed.
The frequency-to-voltage converter receives the ac signal from the speed sensor and changes it to a proportional dc voltage.
A speed-reference circuit generates a dc “reference” voltage to which the speed
signal voltage is compared. See Woodward manual 82510, Magnetic Pickups & Proximity
Switches for Electronic Controls, for more information on magnetic pickups.
The speed-signal voltage is compared to the reference voltage at the summing
point. If the speed-signal voltage is lower or higher than the reference voltage, a
signal is sent by the control amplifier calling for an increase or decrease in
speed.
The actuator responds to the signal from the control amplifier by repositioning the
fuel or steam rack, changing the speed of the prime mover until the speed-signal
voltage and the reference voltage are equal.
A failed-speed-signal circuit monitors the speed-signal input. When no signal is
detected, it calls for minimum fuel. The minimum-fuel signal is sufficient to cause
the actuator to go to the minimum position if not restricted. However, due to
linkage adjustment or other restrictions in the external system, minimum actuator
position may not permit prime-mover shutdown.
Please contact Sunny sales@xiongbagk.cn for the best price.
➱ sales manager: Sunny
➱ email mailto: sales@xiongbagk.cn
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➱ phone/Whatsapp: + 86 18059884797
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