YOKOGAWA DPharp EJXC40A, Руководство пользователя

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<5. Wiring>
5-7
IM 01C25W05-01EN
5.5.5 Fixing the DRS Cable
WARNING
If the DRS cable is 15 m or longer or if the
flameproof packing adapter (cable gland) is not
tightened sufficiently, the weight of the cable
itself may cause tension on the connector and
make the cable come off. Refer to the user’s
manual of the flameproof packing adapter (cable
gland), and fix the DRS cable in place so that
tension is not applied to the connector.
50 mm or more
Minimum liquid level
Low pressure
side transmitter
(slave)
High pressure
side transmitter
(master)
F0517.ai
Fix the DRS cable in place
so that tension is not
applied to the connector.
WARNING
Figure 5.17 Fixing the DRS Cable
5.6 Grounding
WARNING
For flameproof types, grounding is a must.
Grounding is always required for the proper
operation of transmitters. Follow the domestic
electrical requirements as regulated in each
country. Ground terminals are located on the inside
and outside of the terminal box. Either of these
terminals may be used.
CAUTION
For a transmitter with built-in lightning protector,
ground as shown in the following figure.
Grounding should be furnished on the lighting
protector side and should satisfy Class C
requirements (ground resistance of 10 Ω or less).
High pressure side transmitter (master)
Ground terminal
(Inside)
Ground terminal
(Outside)
Low pressure side transmitter (slave)
Ground terminal
(Inside)
Ground terminal
(Outside)
F0518.ai
Figure 5.18 Ground terminal
5.7 Power Supply Voltage and
Load Resistance
When configuring the loop, make sure that the
external load resistance is within the range in the
figure below.
600
250
0 15.5 21.25 29.3 42
Load resistor
R (Ω)
Supply voltage E (V DC)
Digital
communication
range
R= E–15.5
0.023
F0519.ai
Figure 5.19 Power Supply Voltage and Load
Resistance