Argon user guide/J5 connector electrical interfacing

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This article explains the internal circuity behind J5 connector of Argon servo drive.

Exceeding ratings may affect drive operation and cause instability or even damage the drive.


Pin electrical categories

Supply

Supply pins output a regulated 5V voltage to external circuits. GND pin is tied to J3 connector V- terminal.

Electrical properties
  • Output voltage 4.9-5.2 V
  • Maximum load 500 mA
  • Maximum injected current -10 mA
Never connect multiple supply outputs parallel. Supply output may be connected only current consuming circuity to prevent current injection to the supply port.

High speed digital input

Simplified HSIN circuity inside the drive. Left side end represents J5 pins and right side continues to drive internal circuity.

HSIN is differential digital input capable of receiving digital signals up to 4 MHz.

Electrical properties
  • Maximum voltage to +/- pins referenced to GND: -0.5 to 6V. Nominal 3.3 or 5.0V.
  • Maximum injected current +/- 10 mA
  • When negative input (-) is left floating, it floats around 2.5V
  • Input state is logic 1 when voltage on positive pin is greater than voltage on negative pin, otherwise it's logic 0
Wiring when driving using differential source
  • Positive (+) inputs: to positive outputs of source
  • Negative (-) inputs: to negative outputs of source
  • GND must be connected to source ground
Wiring when driving using single ended source (TTL, CMOS or open collector)
  • Positive (+) inputs: to outputs of source
  • Negative (-) inputs: leave floating
  • GND must be connected to source ground

Analog input

Simplified analog input circuity inside the drive. Left side end represents J5 pins and right side continues to drive internal circuits.

Analog input accepts ±10V from and may be used as reference signal.

Electrical properties
  • Input impedance ~10 kΩ
  • Maximum +/- pin voltage vs GND ±20V
  • Maximum injected current ±10 mA
  • Sampling resolution 12 bits
Wiring to differential signal source
  • Connect positive output to positive input
  • Connect negative (inverted) output to negative input
  • Connect source ground to GND
Wiring to single ended signal source
  • Connect output to positive input
  • Connect source ground to negative input
  • Connect source ground to GND

Digital output

Simplified digital output circuity inside the drive. Left side end represents J5 pins and right side continues to drive internal circuits.

Digital output is an optoisolated transistor output to drive various types of inputs of target devices (logic gates, relays, lights etc)

Electrical properties
  • Load voltage range 3-24V
  • Maximum allowed load 50 mA
  • Logic 1 state equals conducting state of optocoupler transistor (current flows from + to - pins), logic 0 stops current flow between + to - pins.
  • + to - pin voltage drop at 50 mA less than 2 VDC
Digital output isolation is only functional and does not provide safety insulation. Connect only to ELV circuits.
Wiring to logic gate input (CMOS or TTL)
  • Connect GPO+ pin to target VCC (typ 5V)
  • Connect GPO- pin to target input pin (so input pin is pulled to 5V when output state is logic 1)

Digital input

Simplified digital input circuity inside the drive. Left side end represents J5 pins and right side continues to drive internal circuits. D27 protects optocoupler from reverse polarity and ESD.

Digital inputs are optoisolated (floating potential) inputs for general purpose control signals.

Electrical properties
  • Signal voltage range 3-24V
  • Logic 0 when difference between +/- inputs less than 1.5V, logic 0 when more than 2.9V
  • Current needed to drive logic 1 is 0.8-9 mA depending on input voltage
  • Maximum voltage difference between +/- inputs 27 VDC
  • Maximum voltage difference between +/- inputs vs GND 120 VDC
Digital input isolation is only functional and does not provide safety insulation. Connect only to ELV circuits.
Connection to electromechanical switch or relay
Connection from electromechanical switch or relay to isolated digital input. PSU may be external power supply or 5V supply from J5 connector.
  • See schematics image in right side
Connection to CMOS source
  • Connect source output to GPI+ input
  • Connect source ground to GPI- input
Connection to open collector or TTL source
  • Connect source output to GPI- input
  • Connect source VCC (typ 5V) to GPO+ input

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