Basler Electric DECS-400 - Manual (Page 46)

34 9369700990 Rev R
Figure 5. Soft Start Voltage Reference
Failure to Build Up
The failure to build up function monitors if the active control mode parameter—generator voltage in AVR
mode or field current in FCR mode—has reached the field flash dropout level prior to the maximum field
flash time expiring. If the active control mode parameter does not reach the field flash dropout level before
the maximum field flash time expires, a failure to build up is annunciated and the DECS-400 is disabled
(placed in Stop mode).
A failure to build up is annunciated at the front panel display, through BESTCOMS software, and the RS-
485 Modbus interface (Com 2). Any of the DECS-400‘s six programmable output relays can be configured
to annunciate a failure to build up.
Voltage Matching
Voltage matching is active in AVR (Automatic) control mode and automatically adjusts the AVR mode
setpoint to match the sensed bus voltage. Voltage matching is based on two parameters: band and
matching level.
The band is adjustable from 0 to 20% of the sensed bus voltage and defines the window in which the
generator voltage must be for voltage matching to occur.
The generator to bus PT matching level is adjustable from 90 to 120% and defines the percentage of the
sensed bus voltage to which the generator sensed voltage will be adjustable. The voltage matching
function utilizes the metered generator and bus voltage values to determine band and matched levels.
Control Modes
The DECS-400 provides four control modes: Automatic Voltage Regulation (AVR), Manual, Power Factor
(PF), and Reactive Power (Var).
Functional Description DECS-400