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Wiring Precautions
(1) Connect the grounding wire (IV wire 5.5mm² or
more) to a good earth ground (100 or less
ground resistance). Make the wire as short as
possible. Do not use a common ground shared
with other equipment where earth current may
flow. An independent earth ground is
recommended.
(2) The allowable cable lengths between Toshiba
detector and Toshiba converter for the separate
type flowmeter depend on the electrical
conductivity of the object fluid. Refer to each
specification sheet.
(3) DO1, DO2, and DI use the same common
terminal (COM). This COM can not connect to
other equipments which have their own ground
terminal.
(Power supply for connecting to DI or DO,
etc...) Need to wire separately.
Wiring Precautions (PROFIBUS or Modbus)
(1) For wiring path, avoid places near electrical
equipment that may cause electromagnetic
induction or electrostatic induction interference
(such as a motor, transformer and wireless
transmitter).
(2) Use a PROFIBUS-PA cable or a RS485 twist-pair
cable for signal cable. In addition, make sure to
use a shielded cable to improve noise resistance.
Furthermore, installation of signal cable in metal
conduit is recommended.
(3) General cables are designed for indoor use where
cables are not exposed to humidity, rain, etc.
When you install cables, make sure to check the
operating conditions such as the operating
temperature range of the cable by contacting its
manufacturer.
(4)When you carry out cable end treatment of cable,
use a dedicated cable stripper etc. so that the core
wire of the cable will not be nicked or damaged. In
addition, for cables, be careful of allowable
maximum bend diameter etc. (Basically, do not
install cables in a way cables are twisted or bent.)
(5)Consider installing a PROFIBUS-PA arrester in
the communication path of PROFBUS-PA so that
the electromagnetic flowmeter will not be affected by
lightning etc.
(6) The electromagnetic flowmeter is not equipped
with terminating resistors. Use the terminating
resistor unit for PROFIBUS-PA or junction box,
if necessary.
(7) Only one PROFIBUS-PA cable goes through a
cable gland of the Electromagnetic Flowmeter.
Please use the junction box at system
configuration
.
(8) Install a terminator to flowmeter that connected to
end of Modbus network.
TIC-LF620E
7
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