The Delta MS300 Series is a compact AC motor drive designed for industrial applications requiring motor speed control, flexible communication and space-efficient installation.
For industrial buyers and maintenance teams, however, selecting an MS300 drive requires more than simply matching the motor power in kW or HP. Input voltage, rated current, duty requirements, motor type, communication options and the complete drive model can all affect product selection.
This guide provides a practical overview of the Delta MS300 Series and explains the key information buyers should confirm when selecting a new drive or sourcing a replacement.
What Is the Delta MS300 Series?
The Delta MS300 is a compact variable frequency drive used to control AC motors in industrial machinery and automation systems.
A VFD controls motor operation by adjusting the frequency and voltage supplied to the motor. Depending on the machine and control requirements, this can provide controlled acceleration, deceleration, speed adjustment and other motor-control functions.
Delta MS300 features include:
- Compact drive design
- V/F control
- Sensorless Vector Control (SVC)
- Sensorless Field-Oriented Control (FOC)
- Support for induction and permanent-magnet motors
- Built-in PLC function
- Built-in Modbus communication
- Safe Torque Off (STO)
- Optional industrial communication interfaces
Do not select an MS300 only by motor power
A request such as “I need a 2.2 kW Delta inverter” may not contain enough information to identify the correct drive.
Before ordering, buyers should also confirm:
- Complete drive model
- Input voltage and phase
- Rated output current
- Motor type and rating
- Normal-duty or heavy-duty requirement
- Communication requirements
- Application requirements
Motor Control Options in the MS300 Series
Different applications require different levels of motor-control performance. The MS300 supports multiple control methods for industrial motor applications.
| Control Method | General Purpose | Purchasing Consideration |
|---|---|---|
| V/F | General frequency / voltage control | Suitable where straightforward motor speed control is required |
| SVC | Sensorless vector control | Improved torque and speed performance without an encoder |
| FOC Sensorless | Higher-performance motor control | Useful where stronger low-speed torque and control performance are required |
Delta specifies support for induction motors as well as IPM and SPM permanent-magnet motors. The appropriate control method depends on the motor and application.
Actual drive configuration should be selected according to the motor, duty requirement and machine application.
Understanding Delta MS300 Model Numbers
The complete MS300 model number contains important information about the drive configuration. Buyers should therefore avoid identifying a replacement only by power rating.
A typical MS300 model may look like:
Depending on the model, the catalog number can identify information such as rated output current, MS300 series, input voltage, protection level, EMC-filter configuration, safety function and model type.
For example, Delta's model-code documentation identifies input-voltage codes including:
- 11 — 115 V single-phase
- 21 — 230 V single-phase
- 23 — 230 V three-phase
- 43 — 460 V three-phase
- 53 — 575 V three-phase for applicable models
Always send the complete catalog number
Similar MS300 drives can have different voltage, current, enclosure, filter or configuration requirements.
For replacement purchasing, copy the complete model exactly from the existing drive nameplate whenever possible.
MS300 Communication Options
Communication requirements are increasingly important when a VFD is integrated into PLC-based or networked automation systems.
The MS300 provides built-in Modbus communication and supports optional communication solutions for several common industrial networks.
| Communication | MS300 Availability |
|---|---|
| Modbus | Built in |
| CANopen | Optional |
| DeviceNet | Optional |
| EtherNet/IP | Optional |
| EtherCAT | Optional |
| PROFIBUS DP | Optional |
| Modbus TCP | Optional |
| PROFINET | Optional |
Confirm communication before ordering
For an automation-system requirement, provide:
- Drive model
- PLC or controller model
- Required industrial network
- Existing communication configuration
- Whether an optional communication card is required
Built-In PLC, STO & Other MS300 Functions
The MS300 combines motor-control functions with several features designed for integration into industrial machines.
Built-In PLC
Delta specifies an integrated PLC function with up to 2,000 steps. This can support drive-related control logic depending on the application.
Safe Torque Off
The MS300 incorporates Safe Torque Off (STO), specified by Delta as SIL2 / PL d.
Overload Capability
Delta specifies different overload ratings for normal-duty and heavy-duty operation.
- Normal duty: 120% rated current for 60 seconds and 150% for 3 seconds
- Heavy duty: 150% rated current for 60 seconds and 200% for 3 seconds
Applications with demanding starting torque, acceleration or continuous-load requirements may require additional review before drive selection.
Where Is the Delta MS300 Used?
Delta lists the MS300 for a broad range of industrial machine applications.
Compact motor control for industrial machinery.
Motor speed control for packaging equipment.
Controlled operation for material-handling systems.
Variable-speed operation according to process demand.
Drive control for industrial textile equipment.
Delta also lists applications including air compressors, woodworking machinery and electronics manufacturing equipment.
Standard vs High-Speed MS300 Models
Buyers should also be aware that the MS300 family includes standard and high-speed configurations.
Up to 599 Hz
Standard MS300 models are intended for common industrial motor-drive applications.
Up to 1,500 Hz
High-speed MS300 configurations are available for applications requiring higher output frequencies.
Do not assume that every MS300 model supports the same maximum frequency. Check the exact drive configuration and application requirement.
Replacing an Existing Delta VFD
For maintenance teams, the requirement is often not a new machine design but replacement of an existing drive.
A practical replacement process is:
Delta identifies the older VFD-M Series as discontinued and replaced by the ME300 / MS300 Series. However, this should not be interpreted as every VFD-M model being a drop-in replacement with any MS300 model.
For replacement sourcing, check:
- Original VFD model
- Input voltage and phase
- Motor rated power
- Motor rated current
- Existing control wiring
- Communication requirements
- Machine/application requirements
- Installation dimensions when relevant
Send a nameplate photo when the model is uncertain
A clear photo of the existing drive nameplate can provide much more useful information than a description such as “Delta 2.2 kW inverter.”
How to Select a Delta MS300 Drive
A practical MS300 selection process should start with the motor and machine, rather than selecting a drive only from a power table.
| Selection Item | What to Confirm |
|---|---|
| Supply | Input voltage and single / three-phase configuration |
| Motor | Motor type, kW / HP and rated current |
| Load | Normal-duty or heavy-duty requirement |
| Control | Required motor-control method and performance |
| Communication | Modbus or required optional industrial network |
| Installation | Environment, enclosure and installation requirements |
| Replacement | Existing model, wiring and machine configuration |
A Better Way to Request a Delta MS300 Quotation
Providing the correct information at the beginning can reduce unnecessary communication and help identify the required drive more accurately.
For a single MS300 drive, send:
Compare these two inquiries:
“I need a Delta 2.2 kW VFD.”
Voltage, current, exact series and application requirements remain unclear.
Brand: Delta
Model: VFD32AMS43ANSAA
Quantity: 2 pcs
Destination: Mexico
If the exact model is uncertain, include clear photos of the existing drive and its nameplate.
For multiple products, sending the complete BOM or purchasing list is generally more efficient than sending models individually.
Delta MS300: Check These Details First
Include the complete catalog number and suffix.
Confirm voltage and phase configuration.
Provide motor power, current and type when relevant.
Identify the machine and operating requirement.
Provide the destination country for quotation evaluation.
