Rockwell Automation 1402-LSM Line Synchronization Module Installation Instructions - Manual (Page 41)

Chapter 4
Application Information
4–7
Discrete Inputs to the PLC–5 Continued
The Lower Speed – Frequency Adjust synchronization error discrete input to
the PLC–5 indicates that the Synchronizing Bus is producing voltage at a
frequency higher than that of the Reference Bus.
The Raise Speed – Phase Adjust synchronization error discrete input to the
PLC–5 indicates that the Synchronizing Bus is producing a voltage which is
between 0 and 180 degrees behind the Reference Bus.
Reference Bus Voltage
Synchronizing Bus Voltage
Figure 4.1
The Lower Speed – Phase Adjust synchronization error discrete input to the
PLC–5 indicates that the Synchronizing Bus is producing a voltage which is
between 0 and 180 degrees ahead of the Reference Bus .
Reference Bus Voltage
Synchronizing Bus Voltage
Figure 4.2
!
ATTENTION: If the Synchronization Bus and the Reference
Bus are moving towards synchronization, the discrete inputs to
the PLC–5 for Phase Adjust will not be asserted.
The Raise Power– Load Share Adjust discrete input to the PLC–5 indicates
the prime mover is not producing enough power. The RPM must be
increased.
The Reduce Power–Load Share Adjust discrete input to the PLC–5 indicates
the prime mover is producing an excess of power. The RPM must be
decreased.
Interfacing to the LSM Continued