Tecfluid DFD-2 Manuel d'utilisateur télécharger pdf (Page 3)

2.1 Mains connection

The mains supply voltage is connected to terminals 1 and 2. The mains voltage is indicated on

the label at the side of terminals 1 & 2.

2.2 Input connection

The DFD is designed to be able to work with three basic types of inputs. The different types are

selected by means of jumpers inside the instrument.

2.2.1 Pick-up Input

For the input from turbine flowmeters which use magnetic inductive pick-ups to detect the

movement of the turbine blades, the wiring must be made as following:

DFD Terminal No. Pick-up Terminal No.

14 shield 1 shield

15 live 2 live

16 live 3 live

"live" means the two ends of the pick-up coil.

The input cables must not be installed close to mains cables as these can induce

errors due to electrical interferences.

2.2.2 Electrical contact or open collector input

For connecting inputs from reed switches etc., as one can find for example in COVOL

counters or pulse generators with an open collector output (NPN transistor), the wiring must

be made as following:

DFD Terminal No. COVOL Terminal No. NPN Open Collector

14 shield 1 shield Emitter

15 no connection

16 live 2 live Collector

The shield is connected to one end of the reed switch and the live to the other end.

2.2.3 TTL input

For connecting inputs from electronic equipment with a TTL (5 V pulse) output the wiring

must be made as following:

DFD Terminal No. TTL Signal

14 shield Common

15 no connection

16 live Live

1 2 3 4 5 6 7 8

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Tecfluid DFD-2 Manuel d'utilisateur Page 3