Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 71
Excitation ON
Close FCB Command
FCB closed Status
Alarm (MODBUS)
Open FCB Command
1 s
Input
Output
Output
Output
Input
1 s
FCB closed Status FALSE
1 s
Input
1 s
PWM-Control
In redundant channel operation the FCB closing works as follows:
Main channel: FCB close command is given when Ex. ON command is received
as described above
Redundant channel: FCB close command is given as soon as the redundant
channel becomes active (Standby not active)
Open FCB command is given only in case of received Exc OFF command regardless
whether the AVR is active or in standby operation.
3.4.5.3 Miscellaneous expert functions
Details on expert functions are described in a separate document.
Adjust PID output by multiplying the frequency
gain correction.
a) Kc Freq Dep Linear
b) Kc Freq Dep 2 Both selected: square
Hold ExcOn when GCB
closed
Safety feature for marine applications.
Excitation OFF can only be achieved after GCB
was closed in case GCB status is open again.
Um Filter ena BS 50Hz to
200Hz
Add filter on calculated RMS value
Add filter on calculated RMS value
PID integrator anti windup logic disabled in case
of negative error until integrator is set to 0.
Inverts the PWM output signal
Switch OFF Loss of Exc.
Delay
Monitor function “Loss of Excitation” is disabled
in standby mode. When changing from standby
to active mode, a delay of 5 sec of switching on
monitor function is implemented. Options will
activate monitor function at once when AVR
becomes active
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