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3.27. Power control modes
The Advanced Power Controller modulates the power deliv-
ery with two modes:
•
by changing the phase angle (PA mode);
•
by changing the number of operating cycles with zero
crossing triggering (ZC, BF, and HSC modes). This is
commonly referred to a Pulse Train Mode.
PA
An acronym for
Phase Angle
es the power on the load by modulating the phase angle
(power-on)
.
ZC
An acronym for Zero Crossing, this type of operation
reduces EMC emissions
.
series of conduction (ON) cycles and non-conduction (OFF)
cycles. The cycle time (one ON and one OFF phase) is
constant and can be set from 1 to 200 seconds, or from 0.1
to 20.0 seconds for a fast cycle.
The cycle time can be set with two resolutions (seconds
or tenths of a second) depending on the type of function
allocated to outputs rL1 and rL2.
BF
An acronym for Burst Firing, this operating mode manag-
es load power through a series of conduction (ON) cycles
and non-conduction (OFF) cycles. The ratio of the number
of ON cycles to the number of OFF cycles is proportional
to the value of the power to be supplied to the load. The
repetition period or cycle time is kept as short as possible
for each power value.
The parameter bF.Cy defines the minimum number of con-
Functional diagram of power control modes
Phase angle
PA
, this type of operation manag-
The load power is managed via a
Choice of trigger
mode at steady
Slow cycle
81901 "MSW_GPC-40/600A"_03-2021_ENG_page 106
duction cycles, which can be set from 1 to 10.
In the case of a three-phase load (star without neutral or
closed delta), a value of bF.Cy >= 5 must be set to ensure
correct operation (current balance in the 3 loads).
HSC
An acronym for Half Single Cycle, this type of operation
corresponds to BF operation comprising half on/off cycles
It is useful for reducing flicker with short-wave infrared
loads. It is applied only to single-phase or three-phase
loads with neutral or open delta.
The power delivery mode is set with parameter hd.5.
In each power delivery mode, the maximum RMS current
control can be enabled with the hd.5 parameter. The maxi-
mum RMS current value is set with the parameter Fu.tA.
The following functional diagram shows the different power
control modes.
state
hd.5
Constant cycle time
ZC
Fast cycle
Full wave
Variable cycle time
BF
HSC
.
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