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3.31. Feedback mode
The Advanced Power Controller offers the following possi-
bilities to control power through feedback:
•
V
Voltage;
•
V
Quadratic voltage;
2
•
I
Current;
•
I
Quadratic current;
2
•
P
Power.
Enabling of the control mode is set via parameter hd.6.
Voltage feedback (V)
This is used to maintain a constant load voltage. Compen-
sates for possible variations in line voltage from the nominal
voltage (value stored in the parameter riF.V, expressed in
Vrms).
The voltage value maintained on the load is equal to the
result of the formula
rif.V × (Ou.P [%] / 100)
and is contained in the Modbus 757 register.
Quadratic voltage feedback (V
This is used to maintain a constant load voltage. It com-
pensates possible variations in line voltage from the rated
voltage (value stored in the parameter riF.V, expressed in
Vrms)
.
The voltage value maintained on the load is equal to the
result of the formula
rif.V × Ou.P [%] / 100)
and is contained in the Modbus 757 register.
Current feedback (I)
This is used to maintain a constant load current. It com-
pensates possible variations in line voltage and/or load
impedance with respect to the rated current (value stored in
the riF.I parameter, expressed in Arms).
The current value maintained on the load is equal to the
result of the formula
rif.I × (Ou.P [%] / 100)
and is contained in the Modbus 757 register.
Quadratic current feedback (I
This is used to maintain a constant load current. It com-
pensates possible variations in line voltage and/or load
impedance with respect to the rated current (value stored in
the riF.I parameter, expressed in Arms).
The current value maintained on the load is equal to the
result of the formula
rif.I × Ou.P [%] / 100)
and is contained in the Modbus 757 register.
Power feedback (P)
This is used to keep the load power constant. It compen-
sates possible variations in line voltage and/or load imped-
ance with respect to the rated power (value stored in riF.P,
expressed in kWatts).
The power value maintained on the load is equal to the
result of the formula
rif.P × (Ou.P [%] / 100)
and is contained in the Modbus 757 register.
)
2
)
2
81901 "MSW_GPC-40/600A"_03-2021_ENG_page 116
IMPORTANT!
The feedback calibration can be activated by digital input
(parameters dIG.1, dIG.2, dIG.3, diG.4) or by serial com-
mand (ref. bit 113).
If required, calibration MUST only be activated after first
setting parameter hd.6 = 0 and preferably under conditions
of maximum power on the load (e.g., Ou.P [%] at 100%).
Only after calibration has been carried out can the parame-
ter hd.6 be set to the desired value.
If the operating mode is changed (PA, ZC, BF, HSC), the
feedback calibration procedure outlined above must be
repeated.
The voltage V feedback (or current I feedback or power P
feedback) corrects the % conduction with a maximum val-
ue that can be set in the parameter Cor.V (or Cor.I or Cor.P).
For non-linear loads (e.g., Super Kanthal or Silicon Carbide)
the automatic calibration procedure is NOT NECESSARY,
but the value of parameters ref.V, ref.I and ref.P must be set
directly based on the nominal load specification given in the
data-sheet (see GPC Installation Guide Document).
Note: Feedback mode can not be changed while the unit is
in operation. Software must be off to make the change.
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