819XX_MAN_GRM-H_11-2022_ENG_pag. 60
5.6.1.1. Trigger modes
In power control, the GRM-H provides the following
modes:
• modulation by varying the number of operating
cycles with "zero crossing" (ZC, BF, HSC mode)
• triggering
• modulation by changing the phase angle (PA mode)
“Zero crossing” mode
This is a type of operation that eliminates EMC
interference. This mode manages load power through
a series of ON operating cycles rather than OFF
operating cycles.
FCT at constant cycle time (Tc ≥ 1 sec, settable from
1 to 200 sec) The cycle time is divided into a series of
operating and non-operating cycles in the ratio of the
power to be transferred to the load.
BF to variable cycle time
This mode manages the power on the load through
a series of conduction (ON) cycles rather than 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 TC repeat period is kept to a minimum for each
power value (whereas in ZC mode this period is
always fixed and not optimised).
The parameter bF.Cy defines the minimum number of
operating cycles, which can be set from 1 to 10.
For example if Tc = 10sec, if 20% power value we will have operating for 2 sec (100 operating cycles @ 50Hz)
and non-operating for 8 sec (400 non-operating cycles @ 50Hz).
Example of operation in BF mode at 50% power
5.6. Power control
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