# AutomationDirect GS31-20P5

Hardware · `GS31-20P5` · verification: source checked

The GS31-20P5 is a DURApulse GS30 series enclosed AC variable frequency drive with a 230 VAC single-phase input and three-phase output rated for 1/2 hp. It controls three-phase induction and permanent magnet AC motors using SVC, V/Hz, FOC, encoder or torque mode, and includes RS-485 Modbus communication and integrated dynamic braking. Optional communication, encoder and I/O modules are available.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 1.2020197805 kg |
| Supply voltage | 230 VAC |
| Rated power | 0.372849936 kW |
| Rated current | 2.8 A |
| Frame size | A2 |
| Output type | PWM output |
| IP rating | IP20 |
| Operating temp min | -20 °C |
| Operating temp max | 50 °C |

## Connected

- Manufacturer: [AutomationDirect](https://machineschema.com/manufacturer/automationdirect.md)
- Protocols: [MODBUS ASCII](https://machineschema.com/protocol/modbus-ascii.md), [MODBUS RTU](https://machineschema.com/protocol/modbus-rtu.md)

## Safety

- Safe Torque Off (STO) is built-in.
- Enclosure rating is IP20.
- Temperature rating is -20 to +50 °C.
- UL Listed File # E198015; CE declaration available; RoHS compliant.
- External fuse is user-supplied.

## Study notes

- Control modes: SVC, V/Hz, FOC, encoder or torque mode.
- Input is single-phase 230 VAC; output is three-phase 230 VAC.
- Amperage rating is 2.8 A; variable torque amperage rating is 3.2 A.
- Communication ports are RS-485 (RJ45) and USB B.
- Port protocols are Modbus RTU Slave and Modbus ASCII Slave, up to 115.2k baud.
- Integrated dynamic braking is included.
- Carrier frequency range is 2–15 kHz; output frequency range is 0.1–599 Hz.
- Analog I/O: 2 input channels with 12-bit resolution and 1 output channel with 10-bit resolution.
- Discrete I/O: 7 input points and 3 output points.
- Mounting is 35 mm DIN rail, panel or wall.
- Programming language is Ladder.
- For use with 3-phase induction and permanent magnet AC motors; optional communication, encoder and I/O modules are available.

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 1/2hp with 1-phase input, (VFD) (PN# GS31-20P5) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs31-20p5) (accessed 2026-10-26)
2. [GS31 20P5 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS31-20P5_cutsheet.pdf) (accessed 2026-10-26)

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