# AutomationDirect GS4-2020

Hardware · `GS4-2020` · verification: source checked

The GS4-2020 is a DURApulse GS4 series AC variable frequency drive in a NEMA 1 enclosure. It runs 3-phase induction motors from a 230 VAC supply, rated 20 hp with 3-phase input and 7-1/2 hp with 1-phase input, using either sensorless vector control (SVC) or V/Hz mode. It has an RS-485 port, integrated dynamic braking, a built-in keypad and screw terminals, with optional EtherNet/IP and Modbus TCP cards.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 12.11 kg |
| Supply voltage | 230 VAC |
| Frame size | C |
| Output type | PWM output |
| IP rating | IP20 |
| Operating temp min | -10 °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.
- A user-supplied external fuse is required.
- Agency approvals: UL Listed file E198015; RoHS status Yes (see CE declaration); CE declarations and EU REACH document available; no UL Recognized, UL Hazardous or CSA file numbers.

## Study notes

- Rated 20 hp at 62 A with 3-phase 230 VAC input and 7-1/2 hp at 25 A with 1-phase input; variable torque amperage rating 65 A.
- Nominal input and output voltage 230 VAC; 3-phase output; only 3-phase induction motors listed as the intended load.
- Control mode is SVC (sensorless vector) or V/Hz; output frequency range 0.1 to 599 Hz; carrier frequency range 2 to 15 kHz.
- Communication is one RS-485 port on an RJ12 connector supporting Modbus RTU, Modbus ASCII and BACnet at up to 115.2k baud.
- Discrete I/O: 8 inputs at 24 VDC (sinking/sourcing) and 4 outputs at 240 VAC / 48 VDC, including 2 Form C (SPDT) relays; load current 3 A per relay point and 50 mA per discrete point.
- Analog I/O: 3 inputs (11-bit, 0-20 mA and 4-20 mA, +/-10 VDC) and 2 outputs (10-bit, 0-20 mA and 4-20 mA, 0-10 VDC); input signal also accepts voltage or potentiometer input.
- Output type is PWM; reverse capability is built in; the drive has no integrated EMI filter and is not internally bypassed.
- Programmable in ladder logic; GSLOGIC drive PLC software and GSOFT2 configuration software are listed.
- Frame size C; mounting is panel or wall; connection type is screw terminals.
- Shipping weight 26.7 lb (about 12.1 kg).
- Optional EtherNet/IP and Modbus TCP communication cards are available; BACnet and EtherNet/IP are not part of the built-in port protocols.

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 20hp with 3-phase input, 7-1/2hp with 1-phase input, (VFD) (PN# GS4-2020) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-2020) (accessed 2026-10-26)
2. [GS4 2020 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-2020_cutsheet.pdf) (accessed 2026-10-26)

---

Source page: https://machineschema.com/hardware/automationdirect-gs4-2020  
JSON: https://machineschema.com/hardware/automationdirect-gs4-2020.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.