Toshiba LF410/LF600, LF410/LF602 specifications Wiring Precautions Profibus

Page 10

LF410/LF600 LF410/LF602

Wiring Precautions

(1)Explosion proof type flowmeters are not provided cable glands.

Refer to the part Cable connection port at detector and converter.

(2)Connect the grounding wire (IV wire 5.5mm² or more) to a good earth ground (100Ω 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.

(3)The allowable cable lengths between the detector and converter for the separate type flowmeter depend on the electrical conductivity of the object fluid. See Figure 12 below.

(4)DO1, DO2 (opt.), and DI (opt.) 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)

(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 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 PROFIBUS-PA 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 PROFIBUS-PA 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.

 

300

 

 

 

 

200

 

 

 

(m)

100

 

 

 

50

 

 

 

cable length

 

 

 

30

 

 

 

10

 

 

 

Allowable

5

 

 

 

3

 

 

 

 

3

5

10 20 30

50 100 200

 

 

Conductivity (μS/cm)

Figure 12. Electrical Conductivity and

Cable Length

10

Image 10
Contents Overall Specifications Measurement range in terms of flow velocityModel LF410 and LF414 Detectors Model LF600 and LF602 convertersDigital output DO2 opt Digital output DO1 stdCommunications output : HARTstd Cable connection ports Cable glands Vibration resistanceInstallation DimensionsSeparate type detectors LF410 and LF414 Meter size 15mm 1/2 Separate type detectors LF410 and LF414 Meter size 25mm External Connections Combined type LF410/LF600 and LF414/LF600 flowmetersSeparate type LF410/LF602 and LF414/LF602 flowmeters Wiring Precautions Wiring Precautions ProfibusPiping Precautions Grounding of the Combined type and Separate typeCalibration Range Meter SizeTo select the meter size PED matrix in each flange connectionOrdering Information About establishment environmentSpecification Code Wafer type detector LF410 Series Specification Code for converters ISO9001 and ISO14001 are certified