Woodward 2301E-ST, Installation And Operation Manual

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Manual 26694 2301E-ST
Woodward 23
The type of the analog input signals can also be chosen from one of the following options:

4–20 (mA)

0–5 (V)

±2.5 (V)

1–5 (V)
Synchronizer Bias Signal Input is determined as ±2.5 V that is
automatically set up by software.
MPU Speed Sensor Inputs (Terminals 25-30)
The 2301E-ST accepts a signal from one (or optionally two) passive magnetic pickup unit (MPU) speed
sensors to sense turbine rotor speed. It is best if these MPU speed sensors are mounted off a gear
connected or coupled to the turbine’s rotor. Connect the MPU speed sensor #1 to terminals 25, 26, and
27(shield) as shown in Figure 2-2a. If a second optional MPU is utilized, connect it to terminals 28, 29,
and 30 (shield) as shown in Figure 2-2a. Note that the 2301E-ST controller’s software program must be
correctly configured to sense and use the second MPU input within its controller algorithms. If the 2301E-
ST controller is configured to sense two MPU speed sensors, it will utilize its high-signal-select (HSS)
voting logic to select a speed signal to control. With this logic, the speed signal with the higher calculated
speed level will be used by the internal Speed PID controller and by the controller’s Overspeed Detection
logic.
These speed sensor inputs are limited to a frequency range of 100 to 24 950 Hz (90 to 20 000 rpm) and a
voltage range of 1.7–35 Vac (a voltage level above 2.7 Vac is required to sense frequencies above 13
000 Hz). For best electrical noise attenuation, it is recommended that that the speed sensor(s) shield wire
only be connected to the 2301E-ST controller, have continuity its entire length to as near the speed
sensor probe as possible, and be insulated from all other conducting surfaces.
With proper MPU, gear size and MPU-to-gear clearance, speed measurement should be capable down to
100 Hz. Check the speed sensor for visible damage. Standard MPU clearance is recommended to be
between 0.25 and 1.0 mm (0.010 and 0.040 inch) at the closest point. Make sure the gear has less than
0.5 mm (0.020 inch) diametric run out. See manual 82510,
Magnetic Pickups and Proximity Switches for
Electronic Governors
.
Relay Driver Outputs (Terminals 44–47)
The 2301E-ST has four discrete output driver channels. Terminals 44, 45, 46, and 47 are configurable
and can be programmed to perform one of the following functions:

SHUTDOWN

ALARM

ELECTRICAL OVERSPEED TRIP TEST

VALVE LIMITER IN CONTROL

SPEED PID IN CONTROL

VALVE LIMITER IN CONTROL

MODBUS CONTROLLED RELAY #1

MODBUS CONTROLLED RELAY #2

MODBUS CONTROLLED RELAY #3

MODBUS CONTROLLED RELAY #4

LEVEL SWITCH
For fail-safe operation, the Shutdown relay should be energized
during normal system operation, and will de-energize when a
shutdown occurs.
Released