Flintec KPFD-8 - Manual (Page 3)

Junction Box Type KPFD – Technical Manual, Rev. 1.02 December 2007 Page 3 of 4
I
NTRODUCTION AND TECHNICAL
D
ATA
The Polyester junction box is designed for the parallel connection of up to 8 digital load cells.
Type No. of load cells Housing size Inputs Output
KPFD-8 up to 8 digital LC 100 x 320 x 81 mm 8x M16 1x M16
The junction box type KPFD is special designed for weigh bridges and silos including surge arrestors for
lightning protection. It can be connected to the instrumentation with a special shielded cable (3x twisted pair
cable, AWG24, and shield according DIN 47 100).
Housing material: Polyester
Protection class: IP66
Cable connection: With screw terminals
Corner correction: Not required
Other: Over-voltage protection by surge arrestors
M
ECHANICAL
I
NSTALLATION
Look for a mounting location which is as dry as possible and protected from environmental stress.
E
LECTRICAL
C
ONNECTIONS
1
2
2
1
1
2
2
1
Figure 1: Dimensions in [mm]
The earth screw (see (2) in fig.1) has to be connected to protective earth or you must establish an electrical
connection to the weigh modules for potential equalisation.
The connection sequence of the load cells should correspond to the corners of the scale, i.e
Corner 1 = Load cell 1, Corner 2 = Load cell 2, etc.
D
IGITAL
L
OAD
C
ELL
C
ABLE
C
ONNECTION
First the cable gland (see (1) in fig.1) must be loosened. Then you have to feed the load cell cable through
the cable gland unless the shrink tube is fully disappeared in the box, because sealing and strain relief must
be done at the cable and not at the shrink tube. The wires (wh, br, ye, gn, gr, pk) have to run below the
printed circuit board and will be pulled back to the top at the upper end of the printed circuit board. Afterwards
you can connect the cables to the screw terminals as indicated below:
Cable coulour Description Terminal designation
white = Excitation + (Input +) weiss / white
brown = Excitation – (Input –) braun / brown
yellow = RS485A out gelb / yellow
green = RS485A out grün / green
grey = RS485A in grau / grey
pink = RS485A in rosa / pink
transparent = Cable shield transparent
After all conductors have been clamped to the terminals, the cable glands must be tightened. Please verify
that all cable glands are tight and the cable is fully stress relieved.