Manual 37443A DSLC-2 - Digital Synchronizer and Load Control
Page 166/226 © Woodward
Base Loading Against A Utility
The base load function is selected by connecting the “Base Load” contact input, terminal 73, to a set of utility
breaker auxiliary contacts. The “CB Aux” contact input, terminal 70, is connected to the generator breaker aux-
iliary contact. When both generator and utility breakers are closed, the unit load will be set to the unload trip lev-
el. When the “Load/Unload” contact connected to terminal 74 is closed, the load ramp starts and the unit load is
increased to match the base load reference setpoint. The base load reference setting can be adjusted up or down
while in the base load mode with the “Load Raise” and “Load Lower” contact inputs. The load raise and lower
inputs cannot adjust the base load reference above the rated value or below zero. The load will follow at a rate set
by the appropriate raise or lower rate setpoints. When both the raise and lower load contacts are closed, the ana-
log remote reference signal becomes active and will take precedence over the internal base load setpoint. The
base load reference will ramp to the remote input setting. If the load raise and lower inputs are removed, the base
load reference will ramp to the internal base load reference setting. The “Load/Unload” input, terminal 74, will
initiate the unload sequence. Opening the unload switch contacts commands the ramp to decrease the demand on
the generator to the unload trip level. When the trip level is reached, the breaker open command relay is momen-
tarily deactivated to separate the generator from the utility. When the “CB Aux” contacts open, the DSLC-2 con-
trol goes into droop behavior and keeps the frequency on the initial state.
Base load
Base load is active when
• CB Aux input is closed
• Load / Unload input is closed
• Base load input is closed
Adjustments when in base load mode
• PID power control
o Base load proportional gain (parameter 5513)
o Base load integral gain (parameter 5514)
o Base load derivative ratio (parameter 5515)
• Base load reference
• Load ramp rate
• Unload ramp rate
• Raise load rate
• Lower load rate
• Load control setpoint source
To Next Page
Loading...
