Woodward 9907-252, Installation And Operation Manual

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Manual 02035 Load Sharing Module
Woodward 11
Chapter 3.
Setup and Calibration
Introduction
Use this calibration procedure after a Load Sharing Module is installed on a
generator set, to obtain the needed operating characteristics during load sharing.
1. Check the input power on terminals 15(+) to 16(–) for 24 Vdc. Proper
polarity must be maintained.
2. Remove wires from load sharing line terminals 10 and 11, and from the
SPM-A Synchronizer (if used) at terminals 24 and 25.
3. Select isochronous operation by shorting terminals 13 and 14.
4. If a speed setting potentiometer is used, set it to mid position (50%).
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
5. Start the engine according to the engine manufacturer’s instructions. Adjust
the engine for rated speed. Apply full load to the generator set.
The most accurate calibration is made at full load. However, if it is
not possible to run the generator set at full load, run it at less than
full load, and reduce the voltage readings given in this calibration
procedure proportionally. For example: run a 200 kW generator set at
100 kW and divide all voltages given in this calibration procedure by
2. If you reduce the load in this manner, be sure to reduce it by the
same amount throughout the calibration procedure.
6. Set the LOAD GAIN potentiometer fully clockwise.
7. Check the load signal voltage between terminals 22 and 23. Adjust the
LOAD GAIN potentiometer for 6.0 Vdc signal. If this voltage is not
obtainable, set the load signal as close as possible to 6 Vdc.
8. Remove the load from the generator set.
9. Check the voltage between terminals 22 and 23. This voltage should be 0.0
± 0.25 Vdc. If this voltage is not correct, the Load Sharing Module is faulty or
there may still be load on the generator.