Flintec FAD-4 - Manual (Page 4)

FLINTEC
Document Date Code Rev. Page
FAD - 4 DIGITAL LOADCELL JUNCTION BOX 02.05.00 FAD4_2RM 2 4 of 20
2 HARDWARE DESCRIPTION – INSTALLATION
Normally FAD-4 comes in a sealed stainless steel enclosure, suitable for wash down environment.
Entry of connecting cable is through sealed cable glands. Refer to Annex A for details of the enclosure and
main PCB 703.2. In addition an analogue output (PCB 760) and a tilt switch may be connected.
2.1 Mounting
The mounting location should be such that the unit is not subject to excessive vibrations or heat.
The top panel should be accessible.
2.2 Wiring
Remove the lid by undoing the four screws.
Insert cables via the cable glands. Strip the cables and connect the loadcells 1 to 4 to connectors ST6 to ST9
respectively. If the loadcell cables are 6 wire connect together the excitation and sense leads or cut off the sense
leads.
Connect the shields of the cables on SHLD terminal or directly on the chassis screws using eyelet terminals.
Power and communication cable is connected via cable gland s. See Annex A connector diagram for details.
Connect serial communication cable according to the drawing “FAD-4/703.2/88”.
When wiring is completed pull out any excessive cable and tighten the cable glands to ensure a firm grip
on the cables. Re-Install the lid and tighten the screws until the side edges are recessed 2mm from the lid edges.
FOR OPTIMUM EMC PERFORMANCE KEEP THE LENGTH OF THE SHIELD INSIDE THE
ENCLOSURE AS SHORT AS POSSIBLE.
2.3 Power
As the instrument is computer controlled it requires clean power for reliable operation.
Power supplied should come from a source that is isolated from other process equipment.
A mains adapter of 7,5 – 10 VAC / 500 mA is recommended for operation of both the RDT-52 and
FAD-4. Connect a power supply 7 - 10 VAC or 7.5 - 12 VDC (150mA min.) to ST1 or to Pin 8, 9 of
DB9 female connector (polarity independent).
2.4 Analogue output
Connect to ST2 of analogue output pcb760 according to drawing “FAD-4/760/040”.
2.5 Setpoint outputs
Connect isolated input / output to ST5 (if used) according to drawing “FAD-4/703.2/040”.
2.6 Tilt switch
Connect a dry contact to Pins 1 & 2 of ST3 directly or to Pins 2, 3 of D9 connector.
The tilt switch wires must be contained in the power and communications cable.
N.O or N.C contact and debounce timer are set in SETUP 1.
CAUTION : Do not run signal cables together with power cables.
Connect the shielding where indicated on the drawing only.
Never use a megger to check wiring.