SG-003A OPERATING MANUAL

2.1 Specifications

2.2 Function Introduction

• Conversion Of Engineering Quantity Display: Signals are displayed as physical or engineering (pure quantity) values. The physical quantity corresponds linearly with the engineering quantity. For example, a current signal of 4~20mA corresponds to 0~100 (4mA=0, 12mA=50, 20mA=100). This range can be modified by parameters.
• Preset Value: Four groups of commonly used signal values can be preset to facilitate quick adjustment of output.
• Signal Conversion: The input signal is converted into an output signal, which can be converted between different physical quantities (e.g., input frequency 0-1000Hz converted to 4-20mA current).
• Programming Output: Automatically and continuously changes output size according to settings. Three modes are available: monotonous rise, monotonous fall, and cycle.
• Real-time Curve: Displays the change trend of input and output signals by drawing a curve. Sampling time can be set, and the display curve automatically adjusts within the range of maximum and minimum values over a certain period.
• Modbus Slave: FNIRSI SG-003A can communicate with configuration software or PLC via RS485 to set the instrument.
• Firmware Upgrade: Uses USB emulated U disk for firmware upgrade.

2.3 Interface Terminal

The device features a signal port with four 4mm inner diameter wiring ports on the top surface, distinguished by different color rings:

• Blue port (IN-): An alternate function, also an input-. Can be switched to a 24V independent test power supply. Internally shorted with the black (COM) port in input state. When acting as independent power supply, there is 24V voltage between (COM) and (IN-) ports.
• Red (OUT) port and black (COM) port: Form an output port.
• Yellow (IN+) and blue (IN-) port: Form the input port.
• When the (IN-) port is an independent power supply, it is called a (24V) port and forms an output port pair with the (COM) port.

2.4 Power & Charge

The device has a built-in 3000mA large capacity lithium battery.

• Battery display: Shows the current battery level in the upper right corner of the display.
• Charging port: Type-C port (DC 5V).
• State of charge: When charging, the power button displays a red light. When fully charged, it automatically stops charging and displays a blue light.

4.1 Switching Of Signal Types

• Press FN on the main interface. After the FN button turns red, press the IN button to enter the input setting to switch input signal type.
• To switch output signal type, press the OUT key to enter output setting. After entering, directly select the desired signal type from left to right. Press FN to exit to the main interface.
• Various signal modes are available for switching under different signal types, each with different parameters that can be set.

4.2 mA Current Signal

• Mode Switch: When the main interface FN is white, press IN/OUT to switch the display of input/output actual value and engineering quantity.
• Output Open Circuit Detection: When output is on, if the interface displays "open circuit" and flashes, it means the output signal is not connected or is close to zero.
• Output Circuit Voltage: FNIRSI SG-003A can set current output no-load voltage. 12V is for power saving. Some devices require 24V drive capability.
• Output Range: The limit range of the current output can be set.

4.3 V Voltage Signal

• Mode Switch: When the main interface FN is white, press IN/OUT to switch the display of actual value and engineering quantity of input/output.
• Overcurrent Protection: If the output voltage is shorted, the output automatically shuts down.
• Output Range: The limit range of the voltage output can be set.

4.4 XMT Passive Current Signal

• Mode Switch: When the main interface FN is white, press IN/OUT to switch the display of actual value and engineering quantity of input/output.
• Output Range: The limit range of passive current output can be set.

4.5 Hz Pulse Signal

• Mode: The pulse signal has four modes: frequency, PWM duty cycle, speed frequency, pulse quantitative/counting. When the main interface FN is white, long press OUT to switch mode.
• Range: Select the frequency output range: 0~99.999Hz, 0~999.99Hz, 0~9999Hz, 0~200kHz.
• Method: Select level/open circuit according to the presence or absence of pull-up.
• Output Peak Value: The level height of the output waveform, highest is 24V.
• Frequency Mode Operation Instructions: The frequency range can be switched by pressing OUT when the main interface FN is white.
• Operating Instructions In PWM Mode: PWM displays two parameters: frequency value (period value) and duty cycle. Frequency value is displayed in the original engineering quantity position (no engineering quantity display). Maximum frequency does not exceed 9999Hz. Frequency value/duty cycle parameters can be set when outputting. When main interface FN is white, press OUT to switch, indicated by a yellow cursor.
• Operating Instructions For Speed Mode:
  1. The speed mode calculates motor or gear speed. One revolution produces 1 pulse. 3000 revolutions per minute equals 50 pulses per second.
  2. Time Unit: Frequency=RPS(per second) × number of pulses per revolution, RPM(per minute)=RPS × 60, RPH(per hour)=RPS × 3600. Maximum frequency does not exceed 9999Hz in speed setting.
  3. Number Of Revolution Pulses: Number of pulses per revolution of motor or gear, selectable in speed setting.
  4. Tooth Missing: Used to simulate engine speed, selected in speed setting.
• Quantitative/Counting Mode Operation Instructions: Main purpose is to simulate quantitative control sensor of flow. Frequency value displayed in original quantity position. Cycle displayed at original engineering position, unit is milliseconds. When main interface FN is white, press OUT to switch between cycle and quantitative values, distinguished by cursors. The period value can be modified during quantitative output. In this mode, when cursor disappears after output is on, backlight of up, down, left, right keys turns blue. Functions of up, down, left, right buttons change: Up is single pulse sent. Down is program stop and reset. Left has no function. Right is start/pause.

4.6 24V Loop Detection

• Select the 24V label in the OUT signal type interface to enter this function. Displays output 24V loop current on main interface. Unlimited input signal detection type.
• Loop 1: After starting output, 24V voltage is output between (OUT) and (COM) ports. Loop current is detected and displayed in "output 24V loop" area. Used to test pneumatic control valves or two-wire transmitters by supplying 24V power and detecting current.
• Loop 2: After activating independent 24V power supply, (IN-) port outputs 24V voltage between (24V) port and (COM) port. Does not affect input signal detection by (IN+) port. Select mA for input signal type. (IN-) port combines with (IN+) port for 24V output, detecting current loop. Function similar to Loop 1.
• Port (IN-): Can be switched to independent 24V power supply function. Outputs single DC24V voltage, acting as (24V) port. (24V) port used with (IN+) to test two-wire transmitters.

• Mode switch: When main interface FN is white, press OUT to switch display position of output actual loop current value and engineering quantity.
• Activate independent 24V: When checked, independent 24V power supply outputs from (24V) port (IN-) and (COM) port, unaffected by input and output signal type switching.
• Activate Hold: When checked, 24V state remains from last turn-on. Otherwise, manual activation is needed each time.

5.1 Engineering

• When analog signal values are used in industrial fields, conversion to engineering quantity value is often necessary. In input and output settings, the instrument can set upper and lower limits of engineering quantity and corresponding signal values.

5.2 Preset Value

• Parameter Setting: Set signal value corresponding to up, down, left, and right buttons.
• Operation Instructions: Start and Exit: When main interface FN is red, press PRESET (up key) to start/exit preset.
• Up, Down, Left And Right Keys: After starting preset, backlight of up, down, left, right keys turns green, and key function changes to "output the set value".

5.3 Signal Conversion

• Input signal is converted to output signal. Example: input frequency 0-1000Hz converted to 4-20mA current.
• Parameter Settings:
  1. Input upper limit/input lower limit: amplitude range of input signal.
  2. Output upper limit/output lower limit: amplitude range of output signal.
  3. Overrun allowed: If checked, for example 1-5V converted to 4-20mA, if input is 0V, output follows to 0mA. If unchecked, output is 4mA and locked within set range.
  4. Automatic operation: If checked, signal conversion automatically starts at next power-on and cancels when exited.
• Instructions: Start and Exit: When main interface FN is red, press CONVERT to start/exit signal conversion mode. After startup, backlight of up, down, left, right keys turn off and have no function.

5.4 Program Output

• Programming output automatically completes N cycles of signal output based on user-set parameters. Used for aging tests of electric/pneumatic valves or PLC program debugging.
• Parameter Settings:
  1. Mode: Single rise, single fall, and cycle.
  2. Number of loops: 0 is infinite, 30000 is maximum.
  3. Start value: Value at each start.
  4. End value: Value at the end of each.
  5. Increment step value: Value of each increment.
  6. Increment step time: Time between each increment.
  7. End stop: Time delay at end value.
  8. Decrement step value: Value to decrease each time.
  9. Decrease step time: Time between each decrease.
  10. Loop stop: Time delay at start value.
• Supplementary Parameter Description: Start and end values of single rise and single fall are selected according to high and low, and do not automatically close.
• Instructions:
  1. Start and Exit: When main interface FN is red, press AUTO (left key) to start/exit programming output mode.
  2. Up, Down, Left and Right keys: After starting programming output mode, backlight of up, down, left, right keys turn blue. Functions change: Top is single run, bottom is program reset, left is single-step run, right is Stop/Continue.

5.5 Real-time Curve

• Instructions: When main interface FN is red, press CURVE (right button) to switch interface with/without curve.
• Parameter Description:
  1. Turn on output curve: Displays output signal curve (Red line).
  2. Automatic output scaling: Automatically adjusts scale range of output signal and y-axis with maximum and minimum curve values.
  3. Input automatic scaling: Automatically adjusts scale range of input signal and y-axis with maximum and minimum curve values.
  4. Acquisition time: Refresh interval of curve, time scale changes with it.

5.6 Output Time

• Output Activation Output Time: When checked, each output automatically turns off after output time expires.
• Output Time: Set output time.

5.7 Communication

• USB connection: Uses USB analog serial port for communication. Charging slows down after checking USB connection.
• Slave address: MODBUS slave address. Refer to attached tables for address and description of instrument register.

7.1 Fault Resolution

• No response when SG-003A is turned on:
  1. Determine if the battery has power and if the indicator light is normal when charging.
  2. Firmware upgrade error operation may lead to system crash.
• Abnormal screen display: Check if the screen is connected properly.
• Abnormal output value or measured value:
  1. Check the signal line.
  2. Check the interface for signal selection.
  3. Verify if the target parameter of the connection exceeds the range indicated by the technical indicator (may cause abnormal operation or damage).
• Error in input and output: It is normal to have minor errors in input and output because input and output are not isolated.

7.2 Equipment Maintenance

• The meter is powered by a 3.7V rechargeable lithium battery. Use the power adapter to extend battery life during long-term use.
• This instrument is not waterproof. Do not use it in a high humidity environment.
• Do not place the unit in an unstable location or where it may be subject to strong vibrations.
• Avoid placing this unit in areas with high humidity, dust, direct sunlight, outdoors, or near high temperatures.

7.3 Firmware Upgrade

The SG-003A uses a USB emulated U disk for firmware upgrade.

Upgrade Steps:

1. Plug the meter into the PC and turn it on. Wait for the PC to recognize the USB drive named "Bootloader".
2. Copy the firmware to be upgraded to the U disk.
3. After a few seconds, the device powers on normally, and the upgrade is successful.