DER2 digital regulator instruction manual - rev. 02 - pag. 7
4. Block diagram
Name
Function
Notes
VOLT
Voltage Calibration
From 75Vac to 150Vac or from 150Vac to
300Vac, see paragraph “Setting the voltage”
STAB
Calibration of dynamic response
Adjustment of proportional gain, see paragraph
on “Stability”.
Hz
Calibration of underspeed protection
intervention threshold
Variation up to -20% with respect to the nominal
speed value set in parameter 50/60.
AMP
Calibration of excitation overcurrent
protection
See paragraph “Calibration of excitation
overcurrent protection”
TABELLA 3: TRIMMERS
Fig 1
5. High Dynamic Response
The High Dynamic Response module, by a
inversion of the excitation voltage, allows a
faster reduction of excitation current than
conventional regulators and consequently a
smaller transient overvoltage as a result of
load removal.
The trends of the output voltage and the ex-
citation voltage in function of time of the
DER2 controller and a conventional regula-
tor, which does not allow the excitation vol-
tage inversion, are compared in Fig. 2
WARNING:
The benefits achieveble by the High Dynamic Response also depend on an accurate set-
ting of the dynamic response of the regulator: if the response is too slow the control system may not
require the excitation voltage inversion, in this case the module would not act and the trend would be
similar to a conventional regulator’s one.
Fig 2
