# AutomationDirect GS21-22P0

Hardware · `GS21-22P0` · verification: source checked

The GS21-22P0 is an enclosed DURApulse GS20 series general-purpose AC variable frequency drive from AutomationDirect. It takes single-phase 230 VAC input and produces three-phase 230 VAC output for a 2 hp motor, using selectable SVC, V/Hz, FOC or torque control modes. It includes RS-485/USB communication, analog and discrete I/O, and integrated dynamic braking.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 1.5195 kg |
| Supply voltage | 230 VAC |
| Rated power | 1.4914 kW |
| Frame size | C |
| 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.
- UL Listed, File # E198015.
- RoHS status: Yes (see CE declaration).
- CE declarations are available; CSA File # is none.
- A user-supplied external fuse is required.

## Study notes

- Input is 1-phase 230 VAC; output is 3-phase 230 VAC.
- Motor rating is 2 hp with 1-phase input; rated amperage 7.5 A, variable torque amperage 8.5 A.
- Control modes selectable: SVC, V/Hz, FOC or torque.
- Communication ports are (1) RS-485 (RJ45) and (1) USB B, at speeds up to 115.2k baud.
- Carrier frequency range 2–15 kHz; output frequency range 0.1–599 Hz.
- Analog I/O: 2 input channels (0–20 mA, 4–20 mA, ±10 VDC; 10-bit and 12-bit) and 1 output channel (0–20 mA, 4–20 mA, 0–10 VDC; 10-bit).
- Digital I/O: 7 discrete inputs (24 VDC, sinking/sourcing) and 3 discrete outputs (240 VAC and 48 VDC, relay/sinking/sourcing), including one Form C (SPDT) relay.
- Discrete output load current: 3 A/point relay, 50 mA/point discrete.
- Integrated dynamic braking is included; there is no integrated EMI filter and the drive is not internally bypassed.
- Mounting is panel or wall with spring clamp terminals; programming language is ladder.
- Optional EtherNet/IP and Modbus TCP card available; EtherNet/IP is not provided on the drive itself.
- Intended for 3-phase induction and permanent magnet AC motors.

## Sources

1. [DURApulse AC General Purpose Drive: 230 VAC, 2hp with 1-phase input, (VFD) (PN# GS21-22P0) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-22p0) (accessed 2026-10-26)
2. [GS21 22P0 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS21-22P0_cutsheet.pdf) (accessed 2026-10-26)

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