Flintec FAD-4 - Manual (Page 3)

FLINTEC
Document Date Code Rev. Page
FAD - 4 DIGITAL LOADCELL JUNCTION BOX 02.05.00 FAD4_2RM 2 3 of 20
1 INTRODUCTION
The FAD-4 is a junction board for connection of up to 4 analogue loadcells. It contains all transducer
electronics to excite the strain gauges, amplify, filter and convert the analogue signal of each loadcell to a
digital form. The outputs from each loadcell are corner corrected and summed to form the scale weight
output. If one loadcell is connected only it should be connected to LC.1 input, two loadcells to inputs 1
and 2 etc.
The weight is output in digital form via an RS485A serial interface or in analogue form via a
0 , 4 – 20mA optional interface.The RS485 interface may be used in multidrop applications where each
FAD-4 has itsown unique address.
All weighing functions necessary for operation of weighing system such as Zero, Tare, No motion
detection, error monitoring are performed by the FAD-4.
An ASCII standard serial interface command set allows FAD-4 to be connected with personal computers,
PLCs ,intelligent peripherals, etc.
The calibration of each corner and of the scale is handled by the FAD-4 through a calibration sequence
initiated via the serial interface. Calibration constants are stored in EEPROM on board.
Calibration sequrity is effected by a CALLOCK hardware inside the DJB which may be sealed and a
PINLOCK software device that once activated inhibits access to calibration constants if the PIN code is
not entered. The unit is also provided with an Audit Trail Counter which is incremented every time the
calibration parameters and / or constants are modified.
The weight data rate is setup selectable to cater for high accuracy static weighing (2-5 conversions/sec) or
medium accuracy dynamic weighing (10-20-40 conversions/sec) applications with computers or other
systems.
The unit has been designed for use in industrial environments and is EMC compliant to EN 45501 standards.
The FAD-4 has two optoisolated setpoint outputs and one optoisolated input. It also has a serial display
and keyboard interface plus a multiprocessor interface at TTL level.
A potential free Tilt switch may be connected to inhibit weighing while the scale is not level.
OPTIONS
OP.1 Analogue output 20mA optoisolated.
OP.2 Automatic Tilt correction device (Two directional).
OP.3 PCLINK software to link to higher level software (DOS or WINDOWS environment).
OP.4 Stainless steel housing 200 x 105 x 45 mm with cable glands or DB9F connector.
OP.5 Mains power adapter 230 VAC to 9 VAC/ 500mA.
OP.6 Remote Display Terminal RDT-52.
OP.7 RS232C/RS485A converter including power adapter 230 VAC to 9 VAC/ 500mA.
OP.9 Custom software on request.