Woodward DSLC, Инструкция по установке и эксплуатации, Страница: 61 / 114

Manual 02007 DSLC Digital Synchronizer and Load Control
Woodward 55
7. If it is desired that the Alarm output will also de-energize the alarm relay
when load reaches the Low Limit PU, set the Low Limit Alarm set point to
Enabled. The alarm will be automatically cleared when load increases to
above the Low Limit DO switch point.
8. If it is desired that the high and low limit switches also activate the High Limit
and Low Limit relay driver outputs, set the Load Limit Switches set point to
Enabled.
9. Set the Load Switch PU and Load Switch DO set points to their desired
operating levels or set the Reverse Power Trip, Instant Reverse Power, Rev
Pwr Time Delay, and Reverse Pwr Level to use the load switch output for a
reverse power relay.
10. When all load control setup is completed, press the “SAVE” key on the
Hand Held Programmer to store modified set points.
11. Record all Menu 2 set points in their respective locations in Appendix A.
Process Control Adjustment
This section contains instructions for setup of the DSLC Process Control. Menu 6
set point for Process Input and Menu 8 set points for Process Reference and
Load Reference are provided to assist in setup and verification of process control
operation.
1. Set Menu 4 set points for Process Control Gain, Process Stability, Process
Derivative, Process Deadband, Process Droop, and Process Filter to their
default values.
2. Set Menu 5 Configuration Key to 49. Set Menu 5 Process Control Action to
Direct or Indirect as required for the process. If increasing load also
increases the process input signal level, use Direct. If increasing load
decreases the process input signal level, use Indirect.
3. Set Menu 2 Load Control Mode to Proportional. The Process Control will
compensate for changes in bus frequency.
4. Set the Process Reference set point to a value requiring approximately 50%
load to maintain the process signal level. If the required process reference is
not known at start-up, operate the DSLC control in base load mode. Use
manual adjustment of load with the Raise Load and Lower Load switches
until the desired process level is obtained. Observe the Process Input signal
on Menu 6 to determine the required Process Reference value.
5. Close the Base Load and the Process switch contacts. Close the
Load/Unload switch contacts.
6. Select the synchronizer run mode to parallel the machine with the bus. The
DSLC control will ramp into process control.
NOTE
In a slow pressure or level maintenance system, the load reference may
ramp to either limit as defined by the High Limit PU or Low Limit PU on Menu
2 and remain there for some time. It will be necessary to get closed loop
control of the process between limits in order to proceed with dynamic
adjustments.