81901A “MSW_GPC-40/600A”_03-2021_ENG_page 113
3.30. Automatic Firing Change function
The dynamic Firing Change feature allows you to switch
between phase angle (PA) and full wave (ZC/BF/HSC) firing
modes in four different configurations:
1. Automatically, by comparing the RMS current on the
load and the threshold (
Fu.tA
-
FC.tA
).
2. Automatically, by comparing the RMS current on the
load and the absolute threshold
FC.thr
.
3. On request from digital input.
4. On request from serial communication.
The switchover is always made by bringing the
power to zero and restarting with the set ramp.
The RMS current condition is only evaluated in steady
state.
The ZC/BF/HSC trigger mode is selected by forcing bit 1 of
parameter
hd.5
to 0:
•
with RMS current < (
Fu.tA
-
FC.tA
) and actuation power
> FC.P;
•
with RMS current < (
FC.thr
-
FC.tA
) and actuation
power >
FC.P
;
•
with open digital input setting (logic state 0);
•
with writing from serial with bit at 0.
The PA trigger mode is selected by forcing bit 1 of parame-
ter
hd.5
to 1:
•
with RMS current >= (
Fu.tA
-
FC.tA/2
);
•
with RMS current >= (
FC.thr
);
•
with closed digital input setting (logical state 1);
•
with writing from serial with bit at 1.
Other features:
•
The parameter FC.tA is the hysteresis for auto-
matic switching and is expressed as a percentage
[0.0...100.0%] of:
–
Fu.tA
;
–
FC.thr
.
•
In any case, the function of the RMS current control
in steady state (
Fu.tA
parameter) remains unaffected
(erosion of power output to limit current).
•
In PA the RMS current is obtained as a full-wave
projection based on the percentage of phase angle
implemented.
•
In ZC/BF/HSC the RMS current is
I.on
.
•
In two-phase or three-phase configuration, the condi-
tions on the RMS currents of the modules are in logical
AND when switching from PA to ZC/BF/HSC and in
logical OR when switching from ZC/BF/HSC to PA.
The following settings are recommended:
•
FC.P
= 5.0%
•
PS.tm
> 4.0 sec
•
G.Out
= 20.0%
3.30.1.
Enabling Firing Change function
Address
Format
GPC-OP
menu
Acronym
Global /
M/E1/E2
GF_eXpress menu
Attribute
Retentive
Type
Unit of mea
-
surement
Default
Single-
node
Multi-
node
Description
1919
895
16 bit
09.04.01
hd.7
Global
MainMenu
→
Global
→
Special functions
→
hd.7
R/W
■
Unsigned
Short
0
The parameter enables the Firing Change function. The mode is identified by an index.
Options:
Index
GPC-M
enabled
GPC-E1
enabled
GPC-E2
enabled
0
1
■
2
■
3
■
■
4
■
5
■
■
6
■
■
7
■
■
■
Increasing the index by a fixed amount results in the following behaviours:
Index +8 = Enabling of Firing Change function from digital inputs.
Index +16 = Enabling of Firing Change function from serial communication.
Index +32 = GPC-E1 follows GPC-M (only applies if GPC-E1 is enabled).
Index +64 = GPC-E2 follows GPC-M (only applies if GPC-E2 is enabled).
Index +128 = GPC-E2 follows GPC-E1 (only applies if GPC-E2 is enabled).
Index +256 = Enabling of
FC.thr
as current threshold.
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