Woodward LS-5 v2 Series - System a Phase Rotation

[O󰆞] Time-dependent voltage monitoring
does not cause decoupling.
4.3.1.14 System A Phase Rotation
General notes
NOTICE!
Damage to the control unit and/or generation equipment
• Ensure that the control unit is properly connected to phase voltages on both sides of
the circuit breaker(s) during installation.
Failure to do so may result in damage to the control unit and/or generation equipment
due to the breaker closing asynchronously or with mismatched phase rotations. Also
ensure that phase rotation monitoring is enabled at all connected components
(generator, breakers, cable, busbars, etc.).
This function will block a connection of systems with wrong phases only under the
following conditions:
• The voltages being measured are wired correctly with respect to the phase rotation
at the measuring points (i.e. the potential transformers in on both sides of the
circuit breaker)
• The voltages being measured are wired so that angular phase shifts or any
interruptions from the measuring point to the control unit do not exist
• The voltages being measured are wired to the correct terminals of the control.
• The con󰈡gured alarm class is of class C or D (breaker relevant alarm).
Correct phase rotation of the phase voltages ensures that damage will not occur during a
breaker closure. The voltage phase rotation alarm checks the phase rotation of the
measured voltages and the con󰈡gured phase rotation to ensure they are identical.
The directions of rotation are di󰈠erentiated as "clockwise" and "counter clockwise". With
a clockwise 󰈡eld the direction of rotation is "L1-L2-L3"; with a counter clockwise 󰈡eld the
direction of rotation is "L1-L3-L2".
If the control is con󰈡gured for a clockwise rotation and the voltages into the unit are
calculated as counterclockwise the alarm will be initiated. The direction of con󰈡gured
rotation being monitored by the control unit is displayed on the screen.
If this protective function is triggered, the display indicates "SyA. phase rotation" and the
logical command variable "07.05" will be enabled.
This monitoring function is only enabled if system A voltage measuring (parameter
1853)
is con󰈡gured to "3Ph 4W" or "3Ph 3W" and the measured voltage exceeds 50 % of the
rated voltage (parameter 1768) or if system A voltage measuring (parameter 1853) is
con󰈡gured to "1Ph 2W" (in this case, the phase rotation is not evaluated, but de󰈡ned by
the 1Ph2W phase rotation (parameter 1859)).
126 LS-5 v2 Series 37650
4 Con󰈡guration
4.3 Con󰈡gure Monitoring
Released