gefran GFX4-IR Configuration And Programming Manual page 61

DELAY TRIGGERING
In firing modes ZC and BF, with inductive loads, this function inserts delay triggering in the first cycle.
The delay is expressed in degrees settable in parameter dL.t, from 0 to 90 degrees. The function is enabled with parameter
Hd.5 (+32).
The function activates automatically if there are OFF conditions for a time exceeding the one settable in dL.oF (if =0 the fun-
ction is as if disabled).
◊
Optimised Delay-Triggering value for transformer: 80°
◊
Optimised Delay-Triggering value for 3-phase transformer: 90°, 90°, 50°
708
DL. T
738
DL. o F
FEEDBACK MODES
The GFX4-IR has the following power control modes:
V-voltage
V -squared voltage
2
I-current
I -squared current
2
P-power
A control mode is enabled with parameter Hd.6.
Voltage feedback (V)
To keep voltage on the load constant, this compensates possible variations in line voltage with reference to the rated voltage
saved in riF.V. (expressed in Vrms).
The voltage value maintained on the load is (ref.V*P%_pid_man/100) and is indicated in the Modbus 757 register.
Voltage feedback (V )
2
To keep voltage on the load constant, this compensates possible variations in line voltage with reference to the rated voltage
saved in riF.V. (expressed in Vrms).
The voltage value maintained on the load is (rif.V*
Current feedback (I)
To keep current on the load constant, this compensates possible variations in line voltage and/or variations in load impedance
with reference to the rated current saved in riF.I. (expressed in Arms).
The current value maintained on the load is (rif.I*P%_pid_man/100), and is indicated in the Modbus 757 register.
Current feedback (I )
2
To keep current on the load constant, this compensates possible variations in line voltage and/or variations in load impedance
with reference to the rated current saved in riF.I. (expressed in Arms).
The current value maintained on the load is (rif.I*
Power feedback P
To keep power on the load constant, this compensates both variations in line voltage and variations in load impedance with
reference to the rated power saved in riF.P. (expressed in KWatt).
The current value maintained on the load is (rif.P*P%_pid_man/100), and is indicated in the Modbus 757 register.
IMPORTANT!
Feedback calibration can be activated from the digital input (parameters DIG and DIG.2) or by serial control (ref. bit113), and
MUST be activated only with Hd.6=0 (the required Hd.6 value can be set only after calibration) and preferably with maximum
power on the load (ex. P_man or P_pid 0 100%).
If you change function mode (PA, ZC, BF, HSC), you have to re-run the Feedback calibration procedure.
Voltage V (or current I or power P) feedback corrects the % of conduction with a maximum settable value in parameter Cor.V
(or Cor.I or Cor.P).
For non-linear loads (ex.: Super Kanthal or Silicon Carbide) the automatic calibration procedure IS NOT necessary. Set the
value of parameters ref.V, ref. I, ref. P based on the specific nominal of the load shown on the data-sheet (ref. GFX4-IR In-
stallation Guide).
80415F_MSW_GFX4-IR_05-2019_ENG
Delay triggering
R/W
(first trigger only)
Minimum non-conduction time to
R/W
reactivate delay triggering
V
V
0 ... 90 °
0 ... 10000ms
(P%_pid_man/100)), and is indicated in the Modbus 757 register.
(P%_pid_man/100)), and is indicated in the Modbus 757 register.
80
10
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