Woodward 2301D, Инструкция по установке и эксплуатации, Страница: 75 / 130

Manual 26247 2301D/2301D-EC Digital Control
Woodward 67
Start Fuel Limit Adjustment
With the prime mover operating at rated speed and no load, note the Fuel
Demand % displayed on the HMI. Set the Start Fuel Level 10% higher than the
fuel demand noted above. Shut down the prime mover. Start the prime mover
and observe the start time, overshoot of speed setting, and smoke emissions
obtained. The Start Fuel Limit may be adjusted as required to optimize the prime
mover starting characteristics. When the prime mover start is initiated the fuel is
set to the start fuel limit, the fuel level is then increased at the rate set by Start
Ramp Rate (%FD/Sec). The fuel-limiting function is turned off automatically when
the speed control takes over.
For prime movers not requiring start fuel limiting, the START FUEL
LIMIT function can be deactivated by setting the Start Fuel Limit to
110%.
Speed Sensor Check
Measure the voltage across terminals 25 and 26 to be sure there is a minimum of
1.0 Vrms at cranking speed, and a maximum of 25 Vrms at rated speed. If the
voltage exceeds 25 Vrms, increase the gap of the speed sensor, and be sure
that there is still a minimum of 1.0 Vrms at cranking speed.
Current Transformer (CT) Phasing Check
This control contains internal current transformers. Due to their low
impedance, shorting their inputs is not effective. The current input
must be removed from the control and shorted externally.
HIGH VOLTAGE—Never disconnect any wire attached to load sensor
terminals 4 through 9 when the prime mover is running unless
temporary 0.5

, 20 W resistors are installed as shown in Figure 4-1,
and all load is removed. The current transformers can develop
dangerously high voltages when open circuited while the prime
mover is running.
1. Go to the
T**KW INPUT CALIBRATION** sheet and observe 03 Gen
Output (read KW) , and LOAD SIGNAL OUT to measure the load sensor
output. The displayed values are not yet calibrated to read Kilowatts, but is
used here for indication.
2. Start the prime mover. With the generator operating in the isochronous mode
and not paralleled, load the generator to as near to full load as possible.
3. Use a clamp-on ammeter and measure the per phase current of the Current
transformer output. Check that current in each of the three CTs are equal. In
a balanced three phase system the Load Signal Out reading will be
approximately:
Load Signal Out = kW Input Calibration Gain X 0.1 X Amps (RMS reading of
one phase)
A clamp-on ammeter is recommended to eliminate the need to open CT
wiring to insert an ammeter in series with the CT output.