Toshiba LF620FB Manual

Electromagnetic Flowmeter Converter LF620FB, LF622FB
Introduction
IR (Infrared) switches enable parameter setting of the
converter without removing the cover. Flow direction
can be set in either way, and its unique 128 x 128 dot
matrix LCD display allows the LCD to be rotated
electronically to 90, 180, and 270 degrees without
opening the cover.
*1: HART protocol (Highway Addressable Remote Transducer) is
a communication protocol for industrial sensors recommended
by the HCF (HART Communication Foundation).
*2: Modbus is the communication protocol. Physical layer is
RS485.
Combined type
Figure1. Configuration connecting with
detector
LF620FB
Figure2. LF620FB series Flowmeter
Converters
Separate typ e
LF622FB
Specifications
Model LF620 and LF622 converters

Approved hazardous location certifications:
Model: LF620FB and LF622FB
cFMus Nonincendive for use in
hazardous(classified)locations:
Class I, II, III, Division 2, Groups A-G
Input signals
Analog signal — the voltage signal from detector,
proportional to process flow rate (for LF622
separate type converter).
Digital input DI
Signal type: 20 to 30Vdc voltage signal
Input resistance: 10k
Number of inputs: one point
Note: DI cannot be used with the Modbus communication.
DI function — One of the following functions can
be assigned to the DI signal.
•Range switching — Selects either the higher or
lower range in the unidirectional or bidirectional
2-range setting.
•Totalizer control — 'Starts/Stops' or 'Resets
/Starts'operation in the built-in totalizer.
•Fixed-value outputs —Outputs fixed-values for
current and pulse outputs for loop check.
•Zero adjustment — Executes zero adjustment
(on-stream at zero flow rate).
Output signals
Current output:
4–20mAdc (load resistance 0 to 750)
Digital outputs — Two points are available as
follows.
Digital output DO1:
Output type: Transistor open collector
Number of outputs: One point
Output capacity: 30Vdc, 200mA maximum
Note: DO1 cannot be used if Modbus
communication connection is 3 lines.
(Refer to table 3 for details)
TIC-LF62FB