Description
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The API611 steam turbine controller designed for small single valve/single valve rack industrial steam turbines. The cost effective configurable controller includes specifically designed algorithms and logic to start, stop, control, and protect small industrial steam turbines or turboexpanders driving compressors, pumps, or industrial fans. This Peak150 model comes in a 120VAC/DC, MODBUS, NEMA4X enclosure for steam turbine digital governor control with overspeed protection.
FEATURES & FUNCTIONALITY
Inputs
Magnetic Pickup Inputs (2):
Two identical inputs, high-signal-selected
Minimum input voltage 1 Vrms, minimum frequency 200 Hz, maximum frequency 15 kHz
Analog Input (1):
Remote Speed Setting signal (4–20 mA or 1–5 Vdc, internal jumper selectable)
Discrete Inputs (8)
Remote (isolated, 5–28 Vdc)
Options:
Raise speed
Lower speed
Emergency stop
Alarm reset
Remote speed set enable
Start
Idle/minimum governor
Select high dynamics or overspeed test
Outputs
Analog Outputs (2):
Actual speed output (scalable, 4–20/0–1 mA)
Configurable readout (scalable, 4–20/0–1 mA)
Options:
Actual speed
Speed setpoint
Actuator output
Remote speed setpoint
Valve ramp value
Actuator Output (1)
4–20 or 0–200 mA (internal jumper selectable)
Relay Outputs (4)
Control model 9905-144 is a speed control from Woodward’s 2301A series. This control is a low-voltage and forward-acting model. The setting of the actuator potentiometer for voltage is different on the forward acting control than on the reverse; the forward acting controls actuator voltage should be set ten percent higher than whatever the voltage for the rated speed was read at. In reference to the rated speed, preliminary settings for this potentiometer should be set to the absolute minimum; this means the potentiometer will be sitting fully counterclockwise on your control.
If using an SPM (speed and phase matching) synchronizer, connect the wires to terminals twenty-five and twenty-six, the positive lead must be connected to terminal twenty-five, and the negative lead must be connected to terminal twenty-six, then using a shielded wire, connect to terminal twenty-seven. It is important to note that the shield should never be connected to the synchronizer. Please advise that the SPM synchronizer is not required for the 9905-144 control to function it is only optional.
Be advised that during the operation of the prime mover and the 9905-144 control, if an error occurs, take caution and make an emergency shutdown of the prime mover; doing so prevents property damage and runaway of the prime mover. It is highly recommended that with the operation of the prime mover and control, an external overspeed shutdown device should be used to assist with the shutdown if the prime mover begins to overspeed; overspeeding of the prime mover can result in a runaway and injury.https://www.weikunfadacai1.com/
Frequently Asked Questions about 9905-144
What are the elements needed alongside the 9905-144 control when operating a prime mover?
Other than the 9905-144, when operating a prime mover, a speed-sensing device, such as an MPU, is required, along with an external power source that operates on 10 to 40 VDC or 12 W, and a proportional actuator that will be used to position the steam- or fuel-metering device. All of these elements together allow for the attached prime mover to be controlled without any potential faults or errors occurring.
What is the difference between this model, which is forward acting compared, to a reverse-acting model such as 9905-146?
The main difference between forward-acting and reverse-acting models is that reverse-acting controls can operate additional Woodward models, such as EGB governors or actuators. Another main difference between the two systems is that reverse-acting systems require more fuel when the current on the actuator decreases; if a complete loss of signal occurs on the actuator, the actuator will automatically turn to full fuel. Due to limited information, it can be difficult to find out how the forward-acting models operate, although it should be fairly self-explanatory leading to the lack of information.
Model recommendation:
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