Woodward 723PLUS Technical Manual page 89

Manual 26482
Start one engine and prepare to clutch in the engine by itself. The first engine to
close its clutch becomes the master 723PLUS control. Before the master can
clutch in, the engine must be running at idle speed, plus or minus the 06 CLUTCH
SPEED WINDOW rpm, for the 01 CLUTCH SYNC TIME. Both prompts are found
under service header P**LOAD CONTROL**. Close the Clutch Request contact to
clutch in the engine by itself. Open the Clutch Request contact to de-clutch the
engine. Increase the engine speed above idle speed by more than the 06 CLUTCH
SPEED WINDOW setting then close the Clutch Request contact to again clutch in
the engine by itself. The engine speed should ramp to idle and, once the engine
speed is at idle within the 06 CLUTCH SPEED WINDOW for the 01 CLUTCH
SYNC TIME, the clutch permissive contact (Relay Output #3) should close. Repeat
this test separately for both engines.
Once clutching operations for both engines have been independently tested, both
engines can be tested together. When clutching two engines together, it is useful to
have one Handheld programmer or the Watch Window PC interface for each
723PLUS control. When clutching two units together for the first time, monitor the
calibrated fuel rack position, 03 ACTUATOR COMMAND % (A**DISPLAY 1**).
Clutch in one engine (this unit becomes the master). Clutch in the other engine
(this unit becomes the slave). When the slave unit is clutched in, monitor the 04
TORQUE DIFFERENTIAL, under the R**TORQUE DEVIATION** service menu.
Both units should attempt to share load equally. If either unit integrates to
maximum fuel or to minimum fuel, de-clutch one engine and troubleshoot the
system.
Verify both engine speeds are the same as the master unit's reference. If the
Handheld programmers or the Watch Window PC interface indicate good torque
sharing, but the actual torques are not balanced, the torque transducer
calibration settings need to be re-verified. The actuator commands may be
different, but neither unit should be at or near 0% or 100% actuator command.
Apply load to the engines and verify that both engines pick up load and load
share equally. Unload the engines and de-clutch the master unit. The previous
slave unit now becomes the master unit. Increase the master engine load to
approximately 50% or as much as is possible or practical. Clutch in the other
(slave) unit. First, the slave will match speed with the master. When the slave
unit's speed matches the Master's speed, plus or minus the 06 CLUTCH SPEED
WINDOW rpm, for the 01 CLUTCH SYNC TIME, the slave 723PLUS control will
issue a clutch permissive (Relay Output #3). Once the slave clutch has closed,
the slave unit will soft load, and the master unit will unload at the slave's load rate
in percent load per second. The rates at which the units load and unload are
determined by the 03 LOAD RATE (P**LOAD CONTROL**) and 02 UNLOAD
RATE (P**LOAD CONTROL**) values. Adjust these values as necessary to
achieve the desired loading and unloading results. Remember the rates used are
those of the unit being clutched (slave) or de-clutched (either unit).
Once the units have reached equal torques,, torque sharing will begin. View the
prompt 10 ON TORQUE SHARING (B**DISPLAY 2**) to verify the torque
sharing function. The load difference between the two units must be 5% or less
before the torque function begins.. De-clutch the slave by opening the Clutch
Request contact. The slave unit will unload and the master unit will load at the
slave's unload rate. When the slave reaches its unload level, 04 UNLOAD TRIP
POINT (P**LOAD CONTROL**), the clutch permissive contacts (Relay Output
#3) will open and the unit should de-clutch. Different combinations of master and
slave units as well as de-clutching combinations can be attempted to verify
proper system operation. See Chapter 6, Faults and Troubleshooting, if there are
any problems.
Woodward
723PLUS Digital Marine Control
79