QI-300-V-485

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



Modbus Current Transformer

Modbus Current Transformer

The QI-300-V-485 from Qeed is a versatile AC and DC ModBus current transformer featuring Modbus RS485 and 0-10 Vdc outputs. This device offers selectable current ranges of 0 to 150 Amps and 0 to 300 Amps, powered by a 12 to 30 Vdc power supply. It ensures safety and reliability with an isolation of up to 3000V between input and output.
The QI-300-V-485 accurately measures AC True RMS and DC currents with bipolar directionality. It can display key metrics such as Maximum Current Value, Minimum Current Value, and Amps Used on its registers. The RMS current values are available as a signed 16-bit integer, a 32-bit floating-point number, and a swapped 32-bit floating-point number. Additionally, Amp-hours Min/Max values can be reset.
The transformer is user-configurable with DIP switches or free software available on our website, allowing adjustments to Baud rate, address, measuring range, and AC/DC settings. It supports easy installation on DIN rail or with screws.
This QI-300-V-485 is particularly valuable for solar panel applications and battery charging networks because of its bipolar current measurement capability.

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

To use the EEPROM settings with the software and a PC, set the DIP switches to off. Otherwise, use the DIP settings to suit your applications. The EEPROM settings offer more options, such as setting the address from 1 to 250 and adjusting the Baud rate up to 115200.
If you want to set up the current maximum range or the bipolar output to 0-10V without using the EEPROM, set the address to 0001.
All changes to the DIP switch settings must be followed by a power reset; otherwise, the changes will not take effect.

QI-300-V-485 Applications

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