Overexcitation limiting, Underexcitation limiting, Var/p.f. mode active – Basler Electric DECS-100 User Manual
Page 22: Manual mode active, Underfrequency active, Communication port, Overexcitation limiting -2, Underexcitation limiting -2, Var/p.f. mode active -2, Manual mode active -2
2-2
DECS-100 Human-Machine Interface
9287500991 Rev M
Overexcitation Limiting
This LED lights when the field current exceeds the programmed overexcitation limit. It stays lit until the
overexcitation condition ceases or the overexcitation time delay expires and the DECS-100 shuts down.
The Overexcitation Limiting LED will flash for 5 seconds when the DECS-100 is powered up following an
overexcitation limiting shutdown.
Underexcitation Limiting
This LED lights when the sensed, reactive power (leading vars) decreases below the programmed
underexcitation limit. It stays lit until the underexcitation condition ceases or the underexcitation time
delay expires and the DECS-100 shuts down. The Underexcitation Limiting LED will flash for 5 seconds
when the DECS-100 is powered up following an underexcitation limiting shutdown.
Var/P.F. Mode Active
This LED lights to indicate that the DECS-100 is operating in the optional Var or Power Factor mode of
control. Var/Power Factor control is enabled through BESTCOMS™ software and when the 52J/K contact
input is open.
Manual Mode Active
This LED lights when the DECS-100 is operating in Manual mode. Manual mode is enabled through
BESTCOMS software.
Underfrequency Active
This LED lights when the generator frequency decreases below the underfrequency setpoint and the
DECS-100 is regulating on the selected volts per hertz curve.
COMMUNICATION PORT
The communication port is located on the rear panel and
consists of a female, RS-232 (DB-9) connector. The
communication port serves as an interface for programming
(setup) of the DECS-100. Figure 2-2 illustrates the location of
the communication port.
Programming requires a standard, nine-pin, serial
communication cable connected between the DECS-100 and
an IBM-compatible PC operating with BESTCOMS software.
BESTCOMS software is a Microsoft Windows®-based
communication software package that is supplied with the
DECS-100. A detailed description of BESTCOMS is provided
in Section 5, BESTCOMS Software.
WARNING!
Lethal voltage is present at the rear panel when the unit is
energized. Rear panel connections should be made only
when the unit is de-energized.
Figure 2-2. DECS-100
Communication Port Location