{"id":"automationdirect-gs21-21p0","model_id":"GS21-21P0","name":"AutomationDirect DURApulse GS21-21P0","summary":"The GS21-21P0 is a DURApulse GS20 series general-purpose AC variable frequency drive sold by AutomationDirect in an enclosed B2 frame. It takes single-phase 230 VAC input and drives a three-phase induction or permanent magnet AC motor rated 1 hp, using SVC, V/Hz, FOC or torque control modes. It has integrated dynamic braking, an RS-485 port with Modbus slave protocols, discrete and analog I/O, and a keypad mounted on the drive.","study_notes":["Control modes are SVC, V/Hz, FOC and torque; output frequency range is 0.1-599 Hz and carrier frequency range is 2-15 kHz.","Discrete I/O: 7 inputs at 24 VDC (sinking/sourcing) and 3 outputs rated 240 VAC / 48 VDC, including one Form C (SPDT) relay; relay load 3 A per point, discrete 50 mA per point.","Analog I/O: 2 inputs (0-20 mA, 4-20 mA, +/-10 VDC, 10-bit and 12-bit resolution) and 1 output (0-20 mA, 4-20 mA, 0-10 VDC, 10-bit).","Communications: one RS-485 port on RJ45 and one USB B port, up to 115.2k baud, Modbus RTU Slave and Modbus ASCII Slave.","EtherNet/IP and Modbus TCP are only available through an optional communication card, not built in.","Programming language stated as ladder; GSLOGIC drive PLC software and GSOFT2 configuration software are listed for the drive.","Connector type is spring clamp terminals; mounting is panel or wall; drive has no integrated EMI filter and is not internally bypassed.","Rated 4.8 A continuous and 5 A for variable torque duty with single-phase 230 VAC input; the 1 hp figure applies to 1-phase input.","Item shipping weight is stated as 2.85 lb (about 1.29 kg), not the net drive weight.","Supplied with a keypad (GS20A-KPD) attached to the drive and a quick start insert."],"safety_notes":["Safe Torque Off (STO) is built in.","Enclosure rating is IP20, so the drive is not protected against water or dust ingress.","Rated ambient temperature range is -20 to +50 deg C.","A user-supplied external fuse is required.","Agency approvals: UL Listed file E198015; CE declaration; RoHS compliant; no UL Recognized, UL Hazardous or CSA file listed."],"sources":[{"url":"https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-21p0","title":"DURApulse AC General Purpose Drive: 230 VAC, 1hp with 1-phase input, (VFD) (PN# GS21-21P0) | AutomationDirect","accessed":"2026-10-26"},{"url":"https://cdn.automationdirect.com/static/specs/cutsheet/GS21-21P0_cutsheet.pdf","title":"GS21 21P0 cutsheet","accessed":"2026-10-26"}],"verification":{"status":"source_checked","checked_at":"2026-10-26","values":12,"method":"llm_source_check"},"updated_at":"2026-10-26","type":"hardware","spec":{"category":"vfd","manufacturer":"automationdirect","controllers":[],"weight_kg":1.2927,"supply_voltage":"230 VAC","rated_power_kw":0.7457,"rated_current_a":4.8,"frame_size":"B2","output_type":"PWM output","ip_rating":"IP20","operating_temp_min_c":-20,"operating_temp_max_c":50,"joints":[],"protocols":["modbus-rtu","modbus-ascii"],"standards":[],"error_codes":[]},"url":"https://machineschema.com/hardware/automationdirect-gs21-21p0","license":"https://creativecommons.org/licenses/by/4.0/"}