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5.3 Cautionary Notes on Wiring
5.3.1 Cautionary Notes on Wiring between Detector and Converter
•
Flow rate signal cable and excitation cable are attached to the detector.
Be sure to use the attached cables.
Note: If the length of the cables exceeds 30m, the cables may not be attached. Check whether
the cables are attached or not referring to the specification.
•
The allowable cable length between the detector and the converter differs depending on the
conductivity of the fluid to be measured. Refer to the Instruction Manual of the detector combined.
•
The end of the attached cable to connect to the converter is covered with cap to prevent entry of
humidity. Do not remove this cap from the cable until the cable is ready to be connected to the
converter.
•
When you connect cables between the detector and the converter, connect the excitation cable first
and then the flow rate signal cable.
•
Since the input signal cable carries very small signals, be sure to install the excitation cable and the
input signal cable in separate thick steel conduit (0.87 inch (22mm)) and separate them from other
large current wiring as much as possible and do not install them in parallel. The cable connection
port is G (PF) 1/2 female thread.
•
The detector side of the attached cable is already connected when shipped from the factory. In
addition, since the terminal box of the detector has airtight structure, avoid removing the wired cable
from the detector.
•
To replace the flow rate signal cable and excitation cable, refer also to the Instruction Manual of the
detector. Before you replace these cables, place an order for packing of the detector terminal box
cover as well as packing for the cable connection to Toshiba or Toshiba representative and make sure
to replace these packings when you replace the cables.
5.3.2 Cautionary Notes on Wiring between Instruments and Converter
•
To avoid 2-point grounding, ground the shield of the output cable at the receiving instrument side as
a rule.
•
Use a grounding wire of IV wire 5.5mm
2
or more. The size of the screw for external grounding
terminal is M4. In addition, do not share the grounding wire with other equipment where grounding
current may flow. (An independent grounding is preferable.)
•
Power cable
When a 3-core cable is used, ground the shield of the cable using the FG terminal.
When a 2-core cable is used, ground the shield of the cable using the external ground terminal and
make it as short as possible.
•
When you replace the Toshiba LF230 flowmeter converter with this converter, be careful that the
cable connection is changed.
