PickData SEM Three Quick Start Manual

Please note that this document is only a short user manual and does not handle every function. The complete manual is available
at www.pickdata.net
TECHNICAL CHARACTERISTICS
Power circuit
Input voltage
Frequency
Maximum consumption
Environmental conditions
Temperature range
Humidity range
Mechanical characteristics
Enclosure material
Protection grade
Unit dimensions (Width x Height x Length)
Weight
Mounting
Maximum working altitude
Serial interface
Type
Baud rate
Data bits
Parity
Stop bits
Characteristics and electrical security
Security
Protection class
External current transformers
Standards
Standards
COMMUNICATION
The device comes equipped with a RS-485 communication port to read and write the parameters of the device or other devices
connected. The protocol used is Modbus RTU.
By default the device is configured with peripheral number 72 (decimal) and communication mode 4 (9600 bps, 8, N, 1). Using
the command for changing the device number it is possible to assign any other number (maximum FF in hexadecimal or 255 in
decimal).
In case you don't remember the slave number, you can return to default number and communication mode following this steps:

Power off the device.

Press permanently reset button.

Power on the device and stop pressing the reset button.
WORKING MODE
SEM Three has 4 different working modes for measuring the electrical parameters of an installation. To
change the working mode you must change the value of register "Working mode" between mode 0
(default), 1, 2 or 3. Belong are shown the details of each mode:

Mode 0: L1, L2 and L3 single-phase. Sum of all values measured in three-phase parameters.

Mode 1: L2 and L3 single-phase. L1 equilibrated three-phase. Sum of all values measured in
three-phase parameters.

Mode 2: L3 single-phase. L1 and L2 equilibrated three-phase. Sum of all values measured in
three-phase parameters.

Mode 3: L1, L2 and L3 equilibrated three-phase. Sum of all values measured in three-phase
parameters.
SEM Three
110 .... 264 Vac
47 .... 63 Hz
2,5 .... 4,5 VA
-10 .... +60ºC
5 .... 95%
Plastic UL94 – V0 Self-extinguishable
IP30
18 x 70 x 109 mm
70 g
DIN Rail (1 module)
2000 m
RS-485 three wires
9600 / 19200 / 38400 / 57600 / 115200 bps configurable
8
Without parity / Even configurable
1 / 2 configurable
CAT III 300 V under EN 61010
Class II
Series TRC and TRA (In / 0,250 A)
UNE EN 61010-1:2010, UNE-EN 61000-6-2, UNE-EN 61000-6-4
L1
Mode 0 L2
L3
L1 (x3)
Mode 1 L2
L3
L1 (x3)
Mode 2 L2 (x3)
L3
L1 (x3)
Mode 3 L2 (x3)
L3 (x3)
V03-020620