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2.5 CURRENT MEASUREMENT CONNECTION
The instruments are equipped with cable holes (one for DEPT and DEC and three for EST and DEC-3)
through which the current measurement cables must be fed uninterrupted.
Insert the current cables as shown in Fig. 6 (instructions are also given on the instrument label).
Use cables with max. external diameter of 7 mm.
P1 and P2 in the following diagrams indicate the correct direction of the current.
(*)
The 500 VAC limit is imposed by standards. The Full Scale is 750 VAC.
(*)The
EST
DEPT / DEC/ DEC-485
DEC3 / DEC3-485
P2
P2
P2
P2
P1
P1
P1
P1
P2
P2
P2
P1
P1
P1
Fig. 6
N.B.: If the voltage and/or current signal connection is accidentally inverted, the instrument's automatic
compensation function corrects the inversion, thereby guaranteeing accurate readings.
3 WIRING DIAGRAMS
This chapter contains the wiring diagrams and instructions required to connect the instrument.
FNote:
The following wiring diagrams are applicable to all instruments with serial number (on label on side
of instrument) greater than 15000 and used in conjunction with ELEXTOOL software.
In all other cases ( DEC, DEC-3, DEPT-P and EST-P) instruments may only be programmed using
the relative Programming dip-switches.
FNote:
Phases L1-L2-L3 shown in the wiring diagrams need not necessarily correspond with those of the
three-phase system.
The voltage and current signal connections must however always correspond.
The wiring diagrams indicate the voltage and current polarities which must be observed.
In the case of inversions the instrument automatically corrects them (except when COGENERATION mode is selected using ELEXTOOL software).
3.1 DEPT AND DEC WIRING DIAGRAMS
3.1.1 Single-phase network
L1
P1
S1
P2
S2
N
The CT may be connected to both the phase
and neutral.
P2
HI
LOW
Fig. 7
P1