gefran GFX4-IR Series Installation And Operation Manual page 35

Figure 48 Connection example for 1 3-phase star transformer without neutral (3 wires) with 3-phase load
Dip-Switches configuration
Dip 1 Dip 2 Dip 3
ON OFF ON
- FIRING MODE: ZC, PA (P>6%)
- HB DIAGNOSTIC AVAILABLE: Partial and total load failure of each single
leg (Diagnostica HB attiva con P>30%)
FAST FUSE needed only for controller without option "F"
See table Fuse/Fuseholders
See notes for use with inductive loads and transformers
Figure 49 Connection example for 1 3-phase star load with neutral (4 wires) + possible single-phase load
Dip-Switches configuration
Dip 1 Dip 2 Dip 3
ON OFF -
- FIRING MODE: ZC, BF, HSC, PA
- HB DIAGNOSTIC AVAILABLE: Partial and total load failure of each single leg
FAST FUSE needed only for controller without option "F" See table Fuse/Fuseholders
NOTE:
Take care about the "F4/N" connection (see the picture)
The wire "F4/N" is required always (also if Load 4 is not used)
80404L_MHW_GFX4-IR_03-2020_ENG
Dip 4 Dip 5
ON ON
Dip 4 Dip 5
OFF OFF
P
Id = ____________
h . V 3 . V . cosj
P = total power
V = line voltage
Vload = line voltage on secondary (load)
Id = current in primary
Ist = current in secondary (3-phase load)
h = transformer output (type 0.9)
if resistive load cosj = 1
V
____
Vd =
V 3
V = line voltage
Vd = load voltage
Id = current in 3-phase load
P = total power 3-phase load
if resistive load cosj = 1
P4 V 3
_________
Id4 =
V cosj
Id4 = current in single-phase load
P4 = power in single-phase load
if resistive load cosj = 1
P
Ist = ______________
V 3 . Vload . cosj
P
Id = _________
V 3 V cosj
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