Woodward 723PLUS - Page 74

723PLUS/Analog Load Sharing Manual 02879
68 Woodward
KW Setting
KW settings affect parallel operation loading parameters.
1. LOAD DROOP PERCENT is the percentage of rated speed the speed
reference will droop when the generator load is increased to maximum load.
Set to desired droop percent.
2. FUEL DEMAND @MIN LD (%FD) must be set at the percentage of fuel
demand when operating at rated speed/no-load. This establishes both the
0% internal load measurement for droop and the no-load fuel demand kW
signal.
3. FUEL DEMAND @MAX LD (%FD) must be set at the percentage of fuel
demand when operating at rated speed/rated-load. This establishes both
the 100% internal load measurement for droop and the full load fuel demand
kW signal.
4. RATED LOAD (KW)—Enter the maximum rated generator load.
NOTE
The fuel demand kW signal is a backup for the kW transducer input should it
fail in either the kW droop or kW isochronous load sharing operating modes.
Accurate fuel demand kW scaling is imperative for continued proper
operation should the kW transducer input fail.
5. LOAD GAIN VOLTAGE—Enter the load gain voltage of the control. A value
of 6.0 is usually sufficient to allow load sharing with other units utilizing 0-3
Vdc analog load sharing lines. This value must be common with all other
controls connected to the common Load Sharing Signal. If only 723PLUS
controls are used in the load sharing scheme, leave this value set to 6.0
Vdc. This value represents 100% Rated generator load to the internal load
sharing bridge.
6. BASE LOAD REFERENCE (KW)—Enter the internal Baseload set point.
This sets the initial internal set point of the Baseload Reference Ramp when
the Load Control enters Base Load mode.
7. UNLOAD TRIP LEVEL (KW)—Enter the unload trip level set point. This
sets the load level at which the generator breaker opens (Relay Output #1)
after the unit unloads following an Unload command. This also sets the
minimum limit for the Load Control reference.
8. LOADING RATE (KW/MIN)—Enter the loading rate. This sets the rate at
which the Load Reference Ramp will increase for soft loading and
increasing load set points.
9. UNLOADING RATE (KW/MIN)—Enter the unloading rate. This sets the rate
at which the Load Reference Ramp will decrease for soft unloading and
decreasing load set points.
10. 2ND LOAD RATE (KW/SEC)—Enter the second load ramp rate. Second
load ramp rate is active when ‘USE CONT D AS RESET’ is set FALSE,
‘USE CONT D AS 2nd LOAD RAMP’ is set TRUE and Contact D is closed.
See Table 3-1 for Contact D configurable functions.