Manual 37443A DSLC-2 - Digital Synchronizer and Load Control
© Woodward Page 125/226
Load Control Droop Adjustment
It is important to setup the DSLC-2 control for correct kW droop operation first. This will verify correct wiring
and operation of the unit in the safest possible manner. The preferred procedure uses a load bank. Only use a
utility or other bus of sufficient capacity for a load if a load bank is not available.
With Load Bank
Do the following steps to verify correct wiring and operation between the DSLC-2 control and the engine speed
control when an artificial load bank is available.
1. Select Menu 2 and the Load droop setpoint. Set droop value to 5.0 %.
The load droop setting is approximate as it depends on the actual gain of the input circuits of the en-
2. Open the isoch/droop switch in series with the “CB Aux” contact input to terminal 70 of the DSLC-2
control. If such a switch is not installed, temporarily remove the connection to terminal 70.
3. Close the circuit breaker to the load bank. Apply kW load to at least 50 % of rated. Observe that engine
speed decreases as load increases. Verify correct load sensor operation by observing for correct voltage,
current and power readings on Menu 7. If incorrect load sensor operation is observed, verify configura-
tion values on Menu 6 and wiring connections to the DSLC-2 control. If load sensor values are correct
and a decrease in speed does not occur when the unit is loaded, verify wiring between the DSLC-2 con-
trol and engine speed control.
4. Apply full load to the generator. Adjust the load droop setpoint as necessary to get the correct speed
droop.
Example: Operating at 60 Hz, 57 Hz at full load indicates 5 % droop. If only 50 % load is possible, then
58.5 Hz indicates 5 % droop. [The load droop setting is only approximate due to dependence on the gain
of the speed control's bias input.]
Without Load Bank
Use this procedure for droop setting when an artificial load bank is not available.
CT/PT Phasing - Operation of the engine/generator set with incorrect CT and PT phasing could cause
serious injury or damage to equipment. If the load on the unit increases rapidly when you close the
breaker, immediately open the breaker and shut the unit down. Check the phasing of the CTs and PTs.
DO NOT permit the unit to continue to pick up load or to operate the system without correcting this
1. Select Menu 2 and the Load droop setpoint. Set to the desired value or use 5.0 %.
The load droop setting is approximate as it depends on actual gain of the input circuits of the engine
2. Open the isoch/droop switch in series with the “CB Aux” contact input to terminal 70 of the DSLC-2
control. If such a switch is not installed, temporarily remove the connection to terminal 70.
3. Calculate the engine speed required to pick up 50 % and 100 % of rated load.
Example:
Rated frequency = 60.0 Hz
Desired droop = 5 % (0.05) or 3.0 Hz
Desired test frequency = 60.0 Hz + %Load x 3.0 Hz
(at 50 % [0.5] load) = 60.0 + 0.5 x 3.0 = 61.5 Hz
(at 100 % [1.0] load) = 60.0 + 1.0 x 3.0 = 63.0 Hz
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