Basler Electric DECS-100 - Manual (Page 69)

9287500991 Rev M DECS-100 BESTCOMS™ Software 5-17
(1) or 0.6 to +1 in 0.001 increments. The background color of this field is green when the DECS-100 is
operating in AVR mode and is regulating the power factor setpoint.
Voltage Matching. The Voltage Matching controls and indicators consist of two buttons and two adjacent
indicators. Clicking the ON button changes the color of the adjacent ON indicator to green and enables
voltage matching by the DECS-100. When Voltage Matching is enabled, the DECS-100 automatically
adjusts the field current to match the generator output voltage with the bus voltage prior to synchronizing.
In order for Voltage Matching to be enabled, the following conditions must be met.
• The Parallel Generator Compensation Contacts (terminals 52L and 52M) must be shorted.
• The DECS-100 Voltage Matching input must be shorted (terminals VM and VMC).
• Var/PF control must be disabled by shorting terminals 52J and 52K (open breaker).
• The DECS-100 must be operating in AVR mode.
Clicking the OFF button changes the color of the adjacent OFF indicator to red and disables the voltage
matching function.
Control Mode. Clicking the AVR button changes the color of the adjacent AVR indicator to green and
enables the AVR operating mode. When operating in AVR mode, the DECS-100 regulates the generator
output voltage at the AVR setpoint. Clicking the FCR button changes the color of the adjacent FCR
indicator to green and enables the FCR operating mode. When operating in FCR mode, the DECS-100
maintains the field current at the FCR setpoint. Enabling the FCR mode turns off Voltage Matching.
Fine Adjustment. Raise and Lower buttons control the fine adjustment of the operating setpoint. These
buttons perform the same function as closing the appropriate set of contacts connected to the External
Adjust terminals (6D and 7 to decrease, 6U and 7 to increase) of the DECS-100. For AVR mode, each
click of the Raise button increases the voltage setpoint 0.01 volts; each click of the Lower button
decreases the voltage setpoint 0.01 volts. The minimum and maximum limits for fine adjustment of the
voltage setpoint are controlled by the Regulator Sensing Voltage setting (System Configuration screen)
and the Fine Voltage Adjustment - Band setting (Setting Adjustments screen). Fine adjustment of the
voltage setpoint can be increased/decreased no higher/lower than the Regulator Sensing Voltage setting
plus/minus the Band setting. For example, a Regulator Sensing Voltage setting of 100 volts and a Band
setting of 10 percent allows the Fine Adjustment function to increase the voltage setpoint to a maximum
of 110 volts and decrease the voltage setpoint to a minimum of 90 volts. For Var, PF, or FCR modes, the
Raise and Lower buttons provide fine adjustment over the entire adjustment range.
Alarm/Status Tab
The Alarm/Status tab indicators provide the status of DECS-100 protection functions, control modes, and
contact inputs. Alarm/Status tab indicators are illustrated in Figure 5-17 and are described in the following
paragraphs.
Protection Alarms. Six protection alarm indicators provide the status of DECS-100 protection functions.
Alarm indicators include Overexcitation Shutdown, Overexcitation Limiting, Underexcitation Limiting,
Generator Overvoltage, Loss of Generator Sensing, and Underfrequency. When a DECS-100 protection
function detects an alarm condition, the appropriate indicator changes from black to red.
Control Status. Two Control Status indicators indicate when the VAR/PF and Manual modes are active.
The Manual Mode Active indicator changes from black to red when the FCR control mode is active. The
VAR/PF Mode Active indicator changes from black to red when the DECS-100 is operating in AVR mode
and correction of power factor or vars is selected.
Switch Status. Three Switch Status indicators indicate when the DECS-100 control inputs are open or
closed. The 52JK switch open indicator changes from black to red when the user-supplied contacts at
terminals 52J and 52K are closed. When this control input is open, selection of PF or VAR mode can be
made on the Operation tab of the Metering, Operation, and Alarms screen. The 52LM switch closed
indicator changes from black to red when the user-supplied contacts at terminals 52L and 52M are
closed. When this control input is closed, parallel control and droop is inactive. The VM switch closed
indicator changes from black to red when the user-supplied contacts at terminals VM and VMC are
closed. When this control input is closed, the Voltage Matching function is active.
Metering Signal. The Metering Signal indicator flashes to indicate when metering is active. A number
beside the indicator tracks how many times the metering and status indicators have been updated. When
the Metering button is clicked or Metering on the Menu bar is clicked followed by Disable Metering, the
Metering Signal indicator stops flashing, the metering update counter stops incrementing, and the
metering functions stop being updated.