QI-300-V-485

Modbus Current Transformer
  • Features
    • Current Converter to Modbus
    • DIP Switch Programmable
    • PC Programmable
    • 0-150 / 0-300 Amp Input
    • 0-10 V Output
    • DIN Rail Mount



Modbus Current Transformer

Modbus Current Transformer

The QI 300 V 485 from Qeed is an AC and DC current transformer with a Modbus RS485 and 0-10 Vdc output. The range is selectable between 0 to 150 and 0 to 300 Amps with a 12 to 30 Vdc power supply. The output is isolated from the input up to 3000V. The unit can measure AC True RMS and DC with bipolar direction. The QI 300 V RS485 can also display on the registers the Maximum current value, Minimum current value, and Amps used. The RMS current value can be viewed as a signed 16-bit integer, RMS current value floating 32 bits, and floating 32 bits swapped. The Amp-hours Min/Max can be reset. The Baud rate, address, measuring range, and the AC/DC setting can be set up with the aid of the DIP switches or the free software available on our website. The current transformer can be mounted on DIN rail or screws. The bipolar current measurement feature is essential to the solar panel business and battery charging networks.

QI-300-V-485 Specifications

Input Current 0-150 Amps Current 0-300 Amps
Accuracy 0.5% Full Scale
Hysteresis 0.2% Full Scale
Resolution 12 bit
Output Modbus RTU 0-10 Vdc
Power Supply 12 to 35 Vdc
Current Consumption Modbus Output 35 mA Voltage Output 25 mA
Response time Modbus RTU 30mS Voltage 0-10V 1000mS
Type of measurement RMS DC
Isolation 3 kV bare wire
Overload 2000 A pulse 300 A continuous
Temperature Rating Operative 5°F +149°F - 15°C +65°C Storage Temperature - 40°F +185°F - 40°C +85°C.
Humidity (non condensing) 0-90%
Housing Material self-extinguishing
Dimensions 4" x 3.5 " x 1.2" 99 x 89 x 30 mm
Protection Rating IP20
Weight 13 oz 370 g
EMC Immunity: EN 61000-6-2. Emission: EN 61000-6-4.
Configuration DIP Switch Configurable PC Configurable

QI-300-V-485 Wiring Connections

Power Supply
Positive Pin 5
Negative Pin 1
Output
Modbus Positive A+ Pin 3
Modbus Negative B- Pin 4
Output
Voltage Positive Pin 2
Voltage Negative Pin 1
Modbus Current transformer wiring diagram
Monopolar Measurement
Modbus Current Transformer with monopolar output
Normal output response. Input 0-300 Amps output 0-10 V or reading in Modbus RTU Registers
Bipolar Measurement
Modbus Current Transformer with bipolar output
Modbus or Voltage output response for the bipolar setting. -300 Amp to +300 Amps 0-10 V with the 5 V being 0 Amps or with Modbus RTU the output will be a signed 16 bit integer.

QI-300-V-485 Register Table

Register Name Comment Register Type R/W Default Value Range Modbus Address
machine_ID machine_ID Unsigned 16 bits R 16 40001
FW_Version Firmware Release Unsigned 16 bits R 40002
addr Modbus Address Unsigned 16 bits R/W 1 1 to 250 40003
Delay Answer Delay Unsigned 16 bits R/W 1 1 to 1000 40004
Baud rate 0=1200
1=2400
2=4800
3=9600
4=19200
5=38400
6=57600
7=115200
 Unsigned 16 bits R/W 1 0 to 7 40005
Parity 0=8, N, 1
1=9,ODD, 1
2=8,Even,1		 Unsigned 16 bits R/W 1 0 to 2 40006
In_Start Start Input (A) Floating 32 bits R/W 0 0 to 2 40007 (LO)
40008 (HI)
In_Stop Stop Input (A) Floating 32 bits R/W 300 AC/DC 0 to 2 40009 (LO)
40010 (HI)
Out_start_V Start Output (mV) Unsigned 16 bits R/W 0 0 to 10000 40011
Out_stop_V Stop Output (mV) Unsigned 16 bits R/W 10000 0 to 10000 40012
filt1 n° of samples for mobile average (1= 100ms) Unsigned 16 bits R/W 1 0 to 32 40013
filt Second level filter for ripple problems on AC measurement Unsigned 16 bits R/W 4096 1000 to 20000 40014
Cutoff Cutoff value (mA) Unsigned 16 bits R/W 1500 40029
RMS_A RMS Current Value (A) Floating 32 bits R 40037(LO)
40038(HI)
status 0=1 Error flash setting
1=1 Error flash calibration
2=1 Over Range
3=1 Under Range		 Unsigned 16 bits R 40048
RMS_100 RMS Value of Current
(A x 100)		 Signed 16 bits R 40050
RMS_sw RMS Current Value (A)
swapped		 Floating 32 bits R 40051(HI)
40052(LO)
Ah Ah counting (resettable) Floating 32 bits R/W 40053(LO)
40054(HI)
A-MAX Max current value/100
(resettable)		 Signed16 bits R/W 40055
A-MIN Min current value/100
(resettable)		 Signed 16 bits R/W 40056
Data High Calibration Data (yy, mm) Unsigned 16 bits R 40057
Data High Calibration Data (yy, mm) Unsigned 16 bits R 40057
Data Medium Calibration Data (day, hour) Unsigned 16 bits R 40058
Data Low Calibration Data (min, sec) Unsigned 16 bits R 40059

QI-300-V-485 DIP Switch table

Description SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
All settings as per the EEPROM 0 0 0 0
Address = 1 0 0 0 1
Address = 2 0 0 1 0
Address = 15 1 1 1 1
2400 Baud rate 0 0
9600 Baud rate 0 1
38400 Baud rate 1 0
57800 Baud rate 1 1
Monopolar True RMS 0
Bipolar Mean Value 1
300 A AC/DC 0
150 A AC/DC 1

DIP Switch Settings

If the first four settings are off, then the set up is via the EEPROM. More options are available via the EEPROM setting such as the Address 1 to 250 and the Baud rate up to 115200.
If you want to set up current maximum range or the polar output to 0-10V without setting up the EEPROM set the Address to 0001.
All changes to the DIP Switch setting must accompany a power reset otherwise changes will not happen.

QI-300-V-485 Applications

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