Delta VFD055C43A-21-5.5kW Vector Control Inverter

Model Part	Significado	Detailed Explanation
VFD	Delta Inverter Identifier	Abbreviation for Variable Frequency Drive, the universal prefix for Delta’s industrial automation inverters.
55	Potência do motor aplicável	For 5.5kW (7.5HP) motores; this is the rated output power of the drive.
C	Series Code	C2000/C2000+ Series – Delta high-performance general-purpose vector inverter, supporting induction motors and permanent magnet synchronous motors.
43	Voltage Class & Phase	4 = 3-phase 400V class (380~480V); 3 = 3-phase input (vs. 1 for single-phase).
UM	Control Mode & Características	Supports Vector Control (FOC), Controle de Torque (TRQ), high-performance algorithm, 200% starting torque at 0.5Hz.
-21	Version & Configuration	Standard version: built-in braking unit (selected power ratings), no built-in EMC filter (external available), compliant with international standards.

Core Technical Specifications (Official 2026 Data)

Categoria	Item	Value	Notas
Basic Specs	Rated Power	5.5kW (7.5HP)	For 5.5kW 3-phase induction motors
	Tensão de entrada	3-phase 380~480V (+10%/-20%)	47~63 Hz, wide voltage range
	Rated Output Current	12UM (heavy duty) / 10.8UM (light duty)	Continuous operation in heavy-duty mode
	Output Frequency Range	0.1~600Hz	For both low‑ and high‑speed applications
Desempenho de controle	Control Mode	Sensorless Vector, Closed-loop Vector, Controle V/F	Switchable closed/open loop
	Torque inicial	200% torque nominal a 0,5 Hz	Ideal for heavy starting loads
	Capacidade de sobrecarga	150% for 60s; 200% for 3s	For shock loads
	Precisão de velocidade	±0,5% (open-loop) / ±0.02% (closed-loop)	High precision speed control
	Torque Response Time	≤10ms	Fast dynamic response
Hardware	Protection Degree	IP20 (cabinet mount)	Finger‑safe; clean environment recommended
	Cooling	Forced air (removable fan)	Easy maintenance, longa vida útil
	Built-in Functions	Braking unit (≤7.5kW), CLP (5,000 steps)	High integration, fewer external parts
	Comunicação	RS-485 (Modbus RTU) padrão	PROFINET/EtherNet/IP/CANopen optional
Environment	Operating Temp	-10~40°C (derate 40~50°C)	Derate 1% per °C above 40°C
	Storage Temp	-20~60°C	Avoid moisture & corrosive gas
	Umidade	5~95% (non‑condensing)	Suitable for industrial environments

III. Core Features & Vantagens

3.1 High‑Performance Control

Vector control: Precise independent torque & speed control for complex loads.

Built-in PLC: 5,000-step logic programming for simple automation, reducing external PLC dependency.

Auto energy saving: Dynamically adjusts output voltage; saves 20~50% at light load.

Motor auto-tuning: Completes matching in <10é, simplifies commissioning.

3.2 High Reliability Design

Modular structure: Hot-swappable keypad, expandable I/O and communication cards for easy maintenance.

Full protection: Overcurrent, sobretensão, subtensão, overheat, sobrecarga, perda de fase, earth fault, etc..

Safe stop: Supports STO (Torque seguro desativado), SIL 2 certified.

Wide grid tolerance: Withstands ±15% voltage fluctuation for harsh grids.

3.3 Flexible Communication & Expansion

Standard RS-485 Modbus RTU for multi-drive network control.

Optional modules: PROFINET, EtherNet/IP, PROFIBUS DP, CANopen.

Compatible with Siemens, Mitsubishi, Rockwell PLCs via standard telegrams and process objects.

Remote monitoring & diagnostics via Delta DIAStudio or TIA Portal.

Applications & Selection Tips

4.1 Recommended Applications

Industry	Aplicações Típicas	Características
General Machinery	Pumps, fãs, compressores, misturadores	Energy saving, stable operation, longer equipment life
Material Handling	Conveyors, cranes, hoists, packaging machines	High precision speed control, heavy start, quick stop
Metal Processing	Lathes, milling, grinding, punching machines	High response, precise positioning, torque control
Textile & Dyeing	Textile machines, dyeing machines, stenter frames	Constant tension, synchronous operation, wide speed range
Plastic & Rubber	Injection molding, extrusion, blow molding	Significant energy saving (20~60%), stable pressure control

4.2 Selection Key Points

Correspondência de poder: Use VFD055C43A-21 for 5.5kW motors; avoid undersizing.
Load type:

Constant torque (transportadores, misturadores): use heavy-duty mode (12UM).

Variable torque (fãs, bombas): light-duty mode (10.8UM) for better efficiency.

Control requirements:

High-precision positioning: use encoder (PG card) closed-loop vector.

Network control: add communication module (por exemplo, PROFINET).

Environment:

High temperature: extra cooling or derating required.

Dusty environment: dust cover + regular fan cleaning.

Replacement Models & Upgrade Path

5.3 Upgrade Suggestions

Basic upgrade: VFD‑M/GD10 → C2000+ for better precision & functions.
Communication upgrade: Add PROFINET card for Industry 4.0 connectivity.
System upgrade: Combine with Delta PLC (DVP series) & HMI for full automation solution.

Buying Notes

Confirm suffix -21 (standard version), avoid old versions (por exemplo, -00).
Verify power & atual: 5.5kW → 12A rated.
Buy from authorized Delta channels for genuine product & service.
Order accessories as needed: communication card, keypad, braking resistor.

VII. Instalação & Maintenance

7.1 Installation Rules

Mounting: Wall/cabinet mount, vertical installation; ≥150mm clearance top & bottom for ventilation.
Wiring:

Separate power & control cables to avoid interference.

Shielded cable for signals, single‑end grounding.

Braking resistor matched to power (≤7.5kW internal; external ≈100Ω/500W).

Aterramento: Ground resistance ≤4Ω for safety & noise immunity.

Delta VFD055C43A-21 is a high‑performance 5.5kW vector inverter from the C2000+ series, featuring high precision, confiabilidade, and expandability for diverse industrial applications. With built-in PLC, wide voltage tolerance, and complete protection, it is an excellent choice for general industrial drive solutions. Select based on motor power, load type, control requirements, and environment for optimal performance and cost-effectiveness.

Complete Replacement Guide for Delta VFD055C43A-21

Delta Internal Replacements (C2000+ Series, Seamless Compatibility)

1.1 Direct Same‑Series Replacements

Fault Code	Causa	Solução
OC	Overcurrent	Check motor short, sobrecarga, acceleration time
OV	Sobretensão	Check mains voltage, deceleration time, braking resistor
UV	Subtensão	Check input phase, tensão, cable size
OH	Overheat	Check fan, ventilation, temperatura ambiente
PH	Phase loss	Check input/output wiring, motor winding

1.2 Near‑Power Replacements

Modelo	Power	Corrente nominal	Key Features	Application
VFD055C43A-21 (Original)	5.5kW	12UM / 10.8UM	C2000+, vector, built-in brake, RS-485	General industry
VFD055C43A-21 (Upgraded)	5.5kW	12UM	Better cooling, 10,000-step PLC, more protocols	New projects
VFD055CH43A-21	5.5kW	12UM	CH2000, fan/pump specialized	Fans, bombas
VFD055CP43B-21	5.5kW	12UM	CP2000, hoist/crane dedicated	Cranes, hoists

Global Brand Replacements (5.5kW / 400V Vector)

2.1 Premium Brands

Marca	Modelo	Série	Controlar	Advantage
Siemens	6SL3210-1KE21-3UF1 (G120C PN)	SINAMICS G120C	Vector/V/F	PROFINET, EMC filter
Mitsubishi	FR-A840-00720-2-60	FREQROL A840	Vector	High response, built-in PLC
Yaskawa	CIMR-AB4A0018FBA	A1000	Vector	Low noise, stable
Schneider	ATV320U75N4	Altivar 320	Vector/V/F	Compact, multi-protocol
ABB	ACS550-01-012A-4	ACS550	CDT	High torque accuracy

2.2 Cost‑Effective Brands

Marca	Modelo	Série	Controlar	Advantage
Inovação	MD280NT5.5GB	MD280	Vector	PROFINET supported
Veichi	AC70-T3-055G	AC70	Vector	Full-featured, baixo custo
INVT	CHF100A-5R5G/7R5P-4	CHF100A	Vector	Built-in brake un