DECS-200 Human-Machine Interface 2-27
GEN CT PRI - generator sensing transformer primary current rating
GEN CT SEC - generator sensing transformer secondary current rating
Screen: \CONFG\CNFG_DATA (7.4.1)
SENSING - sensing configuration: single-phase or three-phase
AUX IN TYPE - selects the auxiliary input type as voltage or current
CRSS I GAIN - cross current compensation input gain
Screen: \CNFG AUX Gains (7.4.2)
The auxiliary input allows an analog signal to be externally applied to the DECS-200 to modify the
operating setpoint. The amount of change that may be induced is proportional to the magnitude of the
signal and the input gain.
AVR MODE – auxiliary input gain in AVR mode
FCR MODE – auxiliary input gain in FCR mode
Var MODE – auxiliary input gain in var mode
PR MODE – auxiliary input gain in PF mode
INNER/OUTER – control loop summing point location where the auxiliary input signal is to be injected.
For AVR or FCR mode, select INNER. For var or PF mode, select outer. Once selected, the injection
point remains fixed across all modes of operation.
Screen: \CNTCT\RELAY_1 (7.5.1)
There are three types of relay annunciation: momentary, maintained and latched. A relay that is
programmed for momentary annunciation will do so for a (programmable) time interval and then cease.
The momentary annunciation for an existing condition will not repeat. A relay that is programmed for
maintained annunciation will do so for the duration of the condition that is being annunciated. A relay
programmed for a latched annunciation will continue to annunciate the condition until an alarm reset
command is given through the front panel, BESTCOMS software (via the front RS-232 port) or Modbus™
(via the rear RS-485 port).
OUTPUT SENSE - relay 1 contact normal state: NO for normally open, NC for normally closed
OUTPUT TYPE - type of contact annunciation: MOMENT for momentary, MAINTN for maintained,
LATCHED for latched
MOMENT TIME - the duration of a momentary annunciation
FIELD O/V - assignment of field overvoltage annunciation to output relay 1
FIELD O/C - assignment of field overcurrent annunciation to output relay 1
STATOR U/V - assignment of stator undervoltage annunciation to output relay 1
Screen: \CNTCT\RELAY_1A (7.5.2)
STATOR O/V - assignment of stator overvoltage annunciation to output relay 1
UNDER FREQ - assignment of underfrequency annunciation to output relay 1
IN OEL - assignment of overexcitation limit annunciation to output relay 1
IN UEL - assignment of underexcitation limit annunciation to output relay 1
IN FCR MODE - assignment of FCR mode (Manual) annunciation to output relay 1
NO V SENSE - assignment of lost voltage sensing annunciation to output relay 1
Screen: \CNTCT\RELAY_1B (7.5.3)
AT LO LIMIT - assignment of setpoint at low limit annunciation to output relay 1
AT HI LIMIT - assignment of setpoint at high limit annunciation to output relay 1
BELOW 10 HZ - assignment of generator frequency below 10 hertz annunciation to output relay 1
EXC DIOD OD - assignment of open exciter diode to output relay 1
EXC DIOD SD - assignment of shorted exciter diode to output relay 1
LOSS FIELD - enables and disables annunciation of loss of field protection
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