14 - ATR227 - User manual
t
Load voltage
T
F
0
T
M
T
NF
t
T
F
0
T
M
T
NF
t
T
F
0
T
M
T
NF
50% power T
F
= T
NF
25% power T
NF
= 3 T
F
0
75% power T
F
= 3 T
NF
At 50% power, the modulation time is 40ms:
• 1ring cycle (20ms at 50Hz)
• 1ring cycle (20ms at 50Hz)
For a setpoint less than 50%
:
• The ring time remains constant (1 cycle)
• The non-ring and modulation time
increases
For a setpoint greater than 50%:
• The non-ring time remains constant (1
cycle)
• The ring and modulation time increases.
A . b t . F. Advanced Burst re control
In order to minimise power uctuation during the modulation period, the “advanced
Burst re” SSR output ring mode uses:
· A complete number of cycles for ring
· A complete number of half-cycles for non-ring
Load
voltage
t
T
F
T
M
T
NF
t
T
F
0
T
T
NF
0
Standard Single-Cycle (1 cycle Burst-firing)
Advanced Single-cycle
Load
voltage
For a percentage less than 66%, SSR output
ring takes place as in the “Burst re” mode
(see
bSt.F.
)
For a setpoint greater than 66% in “Advanced
Burst re” mode:
· The non-ring time is constant at one
half-cycle
· Firing takes place over whole cycles.
In a ‘short-wave infrared’ application,
‘advanced Burst re’ ring mode reduces the
brightness of the infrared elements and thus
minimises annoying visual ickering.
In a short-wave infrared application, “advanced Burst re” ring mode reduces the
brightness of the infrared elements and thus minimises annoying visual ickering.
PHs .A. Phase angle control
If this mode is active, the regulation is done through the phase choking
25% Power
50% Power
75% Power
100% Power
Using a no zero-crossing SSR, the ATR227
synchronizes with the power supply volage
(necessarily AC) and determines when
to activate the output to create the right
choking.