Manual 37443A DSLC-2 - Digital Synchronizer and Load Control
© Woodward Page 169/226
Chapter 6.
Var/Power Factor Control Description
Introduction
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The var/power factor control provides a connection to the voltage regulator using the “Voltage Bias” output (ter-
minals 18, 19 and 20) or by enabling the three position controller using relay outputs (terminals 58 and 59). The
“Voltage Bias” output provides a voltage or current signal while the three position controller uses the voltage
raise and lower relay contacts to control voltage and reactive power.
The var/power factor menu has 3 control options:
• Disabled
• PF control
• Var control
Disabled
The voltage bias can still be used for voltage matching but will stay at its value when the breaker is closed. The
voltage bias can be manually adjusted using the voltage raise and lower discrete inputs.
When the “CB Aux” is closed, two voltage biasing output behaviors are possible:
• The Reactive load droop setting, on Menu 4 (parameter 5604), is > 0, then the biasing output reacts with
a droop characteristic based on the last biasing level.
• The Reactive load droop setting, on Menu 4 (parameter 5604), is = 0, then the biasing output remains on
the last biasing level. The voltage regulator must have a droop CT installed with a 1 to 3 % droop ad-
justment. Woodward always recommends to have a droop CT installed and active on the voltage regula-
tor.
PF control
The power factor control is active in
• Base load control
• Process control
• With an active MSLC-2 control
Adjustments when in PF control
• PID var control
o VAR control proportional gain (parameter 5613)
o VAR control integral gain (parameter 5614)
o VAR control derivative ratio (parameter 5615)
The power factor reference can be changed
• Using ToolKit
• Voltage raise and lower discrete inputs
• Remote reactive load input
o This is activated by closing both the voltage raise and lower discrete inputs
o When switching from remote to internal PF reference
Ramps from remote reference to internal Power factor reference (parameter 5620)
• Modbus address
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