6F8A0917

5.3 Cautionary Notes on Wiring

5.3.1Cautionary 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.

5.3.2Cautionary 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 5.5mm2 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.

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Toshiba L5232 manual 6F8A0917