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 Power Inputs

Input

Connector

Min

Typ

Max

Notes

Logic supply

J3

12 V

24 V

24 V

0.4 A max at 12 V†; reverse-polarity protected

Motor supply

J5

12 V

24 V

24 V

1.5 A per axis average, 3.0 A total at 25 °C; reverse-polarity protected

Opto supply

J11.31 (+), J11.32 (−)

12 V

—

15 V†

75 mA max†

Motor-supply fuses: The per-axis input fuse (resettable Positive Temperature Coefficient (PTC) fuse) derates with temperature, to about 1.15 A at 50 °C. Above that the supply may current-limit; this limits power only and does not damage the unit.

Use supplies with output, including ripple and tolerance, that stay at or below 24 V (logic and motor) and 15 V (opto supply). All supplies must be SELV/PELV.

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Internal Rails

Rail

Nominal

Source

5 V (logic)

5.0 V

switching regulator from the logic supply

3.3 V (logic)

3.3 V

linear regulator from 5 V

Encoder supply

5 V, 200 mA†

logic 5 V through a resettable fuse

5 V (motor side)

5.0 V

linear regulator from the motor supply; supplies the driver-side optocouplers

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Absolute Maximum Ratings

Stresses beyond these values may damage the unit. Operation is specified only within the ratings in the other sections.

Parameter

Rating

Logic supply (J3)

−24 V to +24 V

Motor supply (J5)

−24 V to +24 V

Opto supply (J11.31 to J11.32)

16 V

Digital and limit input terminals

−0.3 V to (Opto+ + 5 V), relative to Opto GND†

Digital output terminals

30 V, relative to Opto GND

Encoder input pins

0 V to 4.0 V

Analog input pins

−0.3 V to +6 V

RS-485 lines

−8 V to +13 V

Motor phase current

2.0 A peak per phase (do not exceed by any jumper or trimmer setting)

Storage temperature

−40 to +85 °C†

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Protection

Input

Protection

Logic supply

reverse-polarity MOSFET, 1.5 A resettable fuse (24 V rated), 36 V TVS diode

Motor supply

reverse-polarity MOSFET, 36 V TVS diode, one 1.5 A resettable fuse per axis (24 V rated)

Opto supply

0.25 A resettable fuse (16 V rated), 36 V TVS diode, common-mode choke

USB

0.25 A resettable fuse on VBUS; ESD protection on D+/D−

RS-485

10 Ω series resistors, TVS diodes

Encoder supply

0.25 A resettable fuse

Motor outputs

clamp diodes; driver over-current and thermal shutdown

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Isolation

The logic, motor and field I/O domains have separate grounds and are coupled only through optocouplers. This provides functional isolation (separation of ground returns and noise), not safety isolation. The minimum copper spacing between domains on the board is 0.07 mm; no board-level isolation voltage or hi-pot rating is claimed.

Isolating component

Where used

Isolation rating (component)

Darlington optocouplers

digital inputs, limit/home/latch inputs, digital outputs, microstep-mode lines

2500 Vrms, 1 min (UL 1577)

High-speed logic optocouplers

step, direction, enable and mode signals to the drivers

2500 Vrms, 1 min (UL 1577)

Logic ground is connected to the enclosure through the mounting hardware (via a ferrite bead) and to the USB shield.

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Indicators

LED

Colour

Meaning

Front-panel LED

red

controller status (firmware-controlled)

Motor power

red

motor supply present (inside the unit)

Axis power, X and Y

red

motor supply present after the axis fuse (inside the unit)

Axis enable, X and Y

green

driver enabled (inside the unit)

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