Azbil MagneW Two-wire PLUS+ MTG15A, Руководство пользователя

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3-2
3-1. Electrical wiring
Electrical wiring
Introduction
For this instrument to operate, 15.6 to 42 V DC power supply is required to signals wiring.
The electrical wiring of this instrument is described below as to the following items:

Wiring cable connecting positions

Dedicated cable connecting positions (detector and converter)

Power source and load resistance

Cable selection and cabling

Grounding

Wiring connection of power supply and analog current output

Wiring connection for pulse output

Wiring connection for contact output

Wiring procedure
Note) Do not connect commercial power directly to this instrument. Impressing commercial
power on this instrument causes unrecoverable damage to the internal measuring circuit.
Power and load resistance
Use a direct current (15.6 to 42 V DC) for the power.
Supply 50 V DC or over or 35 V AC or over causes unrecoverable damage to the instrument.
The power ripple should be 1 V or less in peak-to-peak value.
See that the load resistance of the loop wiring should within the operational range shown in
Fig. 3-1. with respect to the power supply voltage used.
1164
385
250
0
15.6 21.05 24 42
21.05 < V < 30
R = V–15.6
0.0218
30 < V < 42
R = V–14.25
0.02383
Supply voltage (V DC)
1
1
2
2
Load resistance (Ω)
Note) A load resistance of at least 250 Ω is
needed for communication with the
SFC or HART® communicator.
Fig. 3-1. Supply power voltage-load resistance characteristics