Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 69
Regulator
AC Exciter Synchronous Machine
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Figure 3-16 Rotating Diode Monitoring application
RDM parameters
Nominal exciter frequency
(Machine) :
Exciter time constant :
Diode monitoring active :
Diode alarm level:
Diode alarm delay :
Diode trip level :
Diode trip delay :
Tconst Exc [s]
Active = TRUE/FALSE
Alarm Level [%]
Alarm Delay [s]
Trip Level [%]
Trip Delay [s]
The device evaluates the alternating current induced in the field circuit of the exciter in
the event of a fault in the rotating rectifier.
The ALARM is triggered in the event of a broken branch in the rotating exciter.
The TRIP is triggered in the event of a branch short-circuit in the rotating exciter.
The machine frequency must be configured prior to using RDM (in the System Data) in
addition to the above-mentioned RDM parameters.
Detecting an alarm or trip is based on the level of ripple current on the exciter frequency,
where the filter is tracked by the measured machine frequency. So in order that RDM is
working correctly the machine voltage must stay above 10% nominal voltage.
3.4.4.6 Data Logger
The Data Logger is a SW-Option. If this SW-Option is not enabled there is only a reduced
functionality available.
It can record max. 12 signals, 7 of which are fixed and 5 of which can be programmed
individually.
Fix predefined signals
Generator Voltage
Generator Current
Reactive Power
Excitation Current
PWM
Generator Status
Generator Operation Mode
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