Electromagnetic Interference (EMI) can be an intermittent condition. Improperly shielded installations can provide good control for a while and then cause problems. For this reason it is important to be sure all shields are properly installed.
Speed range is set on an internal dip switch, available inside the steel cover of
the control. Speeds are set according to the sensor output frequency. The
relationship between prime-mover speed and sensor-output frequency is
expressed in the formula: Sensor Frequency in Hz equals the number of teeth on
the speed-sensing gear times the revolutions per minute of the sensing gear,
times the ratio of the engine speed to the sensing gear speed, divided by 60.
Reverse Acting
Most reverse acting 2301A Speed Controls will operate Woodward EGB
governor/actuators. In reverse-acting systems, the actuator calls for more fuel
when the actuator current decreases. Complete loss of signal to the actuator will
drive the actuator to full fuel. This allows a backup mechanical ballhead governor
to take control rather than shut down the prime mover as would a direct-acting
system.
External wiring connections for reverse-acting controls are identical to those for
direct-acting controls. However, changes must be made to the printed circuit
board should a control need to operate the opposite type of actuator. Contact
Woodward should it be necessary to change the type of 2301A Speed Control.
Changing the supply voltage rating requires exchanging the unit for the properly
rated control.
References
The following Woodward publications contain additional product or installation
information on speed controls and related components. These publications are
available on the Woodward website (www.woodward.com).
Manual
25070 Electronic Control Installation Guide
82510 Magnetic Pickups and Proximity Switches for Electronic Controls
82514 Speed Setting Potentiometers
82343 Digital Reference Unit
Product Specification
82516 EG-3P/-6P/-10P Actuators
82575 EGB-1P/-2P Governor/Actuator
Declaration of Incorporation
In accordance with the EMC Directive 89/336/EEC and its amendments, this
controlling device, manufactured by the Woodward Governor Company, is
applied solely as a component to be incorporated into an engine prime mover
system. Woodward declares that this controlling device complies with the
requirements of EN50081-2 and EN50082-2 when put into service per the
installation and operating instructions outlined in the product manual.
NOTICE: This controlling device is intended to be put into service only upon
incorporation into an engine prime mover system that itself has met the
requirements of the above Directive and bears the CE mark.
