gefran GTF - Softstart Ramp and Delay Triggering; Softstart Ramp Configuration

24
80961F_MSW_GTF/GTF-Xtra_07-2018_ENG
SOFTSTART or START RAMP
This type of start can be enabled either in phase control or pulse train mode and acts via control of the conduction
angle. It is enabled with parameter Hd.5.
The softstart ramp starts from a zero conduction angle and reaches the angle 100.0% conduction angle.
The time can be set in parameter PS.tm, from 0,1 to 60,0 sec.
With parameter Hd.5 (+64), you can congure a linear softstart in power, i.e., starting from zero you reach the power
value corresponding to the maximum conduction angle set in PS.HI. Softstart ends before the set time if power reaches the
corresponding value set in manual control or calculated analog input.
Control of maximum peak current can be enabled with parameter Hd.5 during the ramp phase; peak value is settable
in parameter PS.tA. This function is useful in case of short circuit on the load of loads with high temperature coefcients to
automatically adjust start time to the load.
The softstart ramp activates at the rst start after power-ON and after a software reboot. It can be reactivated via
software control by writing bit 108 or automatically if there are OFF conditions for a time exceeding the one settable in PS.oF
(if =0 the function is as if disabled).
The ramp can also be enabled with parameter Hd.5 (+256) after a software shutdown, i.e., zero is reached in the set
time from delivered power.
0 ... 90 °
20
DL.T
R/W
Delay triggering
(rst trigger only)
60
0 ... 10000ms
21
DL.oF
R/W
Minimum non-conduction time to
reactivate delay triggering
10
DELAY TRIGGERING
In ring modes ZC and BF, with inductive loads, this function inserts delay triggering in the rst 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 function
is as if disabled).
◊ Optimised Delay-Triggering value for transformer: 80°
16
PS.tn
R/W Duration of phase softstart ramp 0.1 ...60,0 s
10,0
17
PS.of
R/W
Minimum non-conduction time
to reactivate phase softstart ramp
0 ...999 s
2
18
PS.ta
R/W
Maximum peak current limit during
phase softstart ramp
0.0 ...999,9 A
13
bit
OFF = Restart not enabled
ON = Restart enabled
R/WRestart of phase softstart ramp
Modello 25A 40A 50A 60A 75A 90A 120A 150A 200A 250A
GTF 70,0 110,0 140,0 170,0 210,0 250,0 340,0 420,0 560,0 700,0
GTF
Xtra
70,0 110,0 140,0 140,0
ADVANCED SETTINGS
53
G.OUt
R/W Gradient for control output 0.0 ...200,0 %/sec
0,0
Set to 0 to disable
22
Lo.p
R/W Minimum trigger output 0.0 ...50,0 %
0,0
10
bit
OFF = Ramp off
ON = Ramp on
R
State of phase
softstart ramp
Read state
11
bit
OFF = Ramp not ended
ON = Ramp ended
R
State of phase
softstart ramp
OFF