Toshiba LF620 Manual

M.A. Selmon Company, Inc
203-377-3525
4 Oxford Rd.
Milford, CT 06460
Introduction
Combined with a multi-functional converter LF620
(combined type) or LF622 (separate type) equipped
with its original noise-suppression circuit and
advanced algorithms. IR (Infrared) switches enable
parameter setting of the converter without removing
the cover. Flow direction can be set in either way, and
its 128 x 128 dot matrix LCD display allows the LCD
to be rotated electronically to 90, 180 and 270 degrees
without opening the cover. The terminal block in LCD
side make easy to wire in case of the combined type.
*1: HART protocol (Highway Addressable Remote Transducer) is a
communication protocol for industrial sensors recommended by the
HCF (HART Communication Foundation).
** DevComm2000 Smart Device Communicator available
through TIC for performing HART device configurations on
PC or laptop .
*2: PROFIBUS is the communication protocol for factory automation and
process automation that the PROFIBUS Organization recommends.
Instead of analog control with a conventional analog signal (4-20mA),
it is one kind of the fieldbus which digitizes all signals. Flowmeters
support PROFIBUS-PA.
*3: Modbus is the communication protocol that Modicon Inc. developed.
Physical layer is RS485.
Figure1. LF620 series Flowmeter Converters
Field Intelligent Device Series
Electromagnetic Flowmeter Converter
LF620 LF622
LF620F LF622F
Certification number
Z01207
Specifications
 Model LF620 and LF622 converters
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: 2.7k
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 optional DI signal.
Range switching — Selects either the higher or
lower range in the unidirectional or
bidirectional 2-range setting.
Totalizer control — Starts and stops the built-in
totalizer.
Fixed-value outputs — Outputs fixed-values for
current and pulse outputs.
Zero adjustment — Executes zero adjustment
(on-stream at zero flow rate).
Output signals
Current output:
4–20mAdc (load resistance 0 to 750)
Note: The current output cannot be used with
the PROFIBUS-PA communication.
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.
Digital output DO2 :
Output type: Solidstate relay output (non
polarity)
Number of outputs: One point
Output capacity: 150Vdc, 150mA maximum
or 150 V ac (peak to peak), 100mA maximum
Note: DO2 cannot be used with the Modbus
communication.
LF620,LF622
TIC-LF620E