Description
Inovance MD290T18.5G/22P | 22 kW 380-480 VAC AC Drive
Product Introduction
The important detail in MD290T18.5G/22P is the dual power designation. This is not simply an 18.5 kW drive with an arbitrary catalog suffix. Inovance defines the MD290T18.5G/22P for an 18.5 kW general-type motor application and a 22 kW fan-and-pump application. The P designation is the fan/pump application class.
For a three-phase 380–480 VAC installation, the drive accepts a nominal 50/60 Hz supply and provides variable-frequency output from 0 to 500 Hz, with a documented 45 A rated output current for this P-class configuration. The published nameplate example shows 59.0 A input current and 45.0 A output current.
MD290T18.5G/22P
Key Technical Specifications
- Manufacturer: Suzhou Inovance Technology Co., Ltd.
- Series: MD290
- Model: MD290T18.5G/22P
- Drive Type: AC variable-frequency drive
- Voltage Class: Three-phase 380–480 VAC
- Input Voltage Tolerance: 380–480 VAC nominal range, with the documented -15% to +10% operating tolerance
- Input Frequency: 50/60 Hz ±5%
- General-Duty Motor Rating: 18.5 kW
- Fan/Pump Motor Rating: 22 kW
- Rated Output Current: 45 A
- Output Voltage: 0–480 VAC
- Output Frequency: 0–500 Hz
- Power Capacity: 54 kVA for the P configuration
- Frame Size: T5
- Application Class: General-purpose and fan/pump applications
- Braking Configuration: The model family documentation distinguishes versions with and without the built-in braking-unit suffix; verify the actual nameplate rather than assuming a braking unit is fitted.
Model-Naming Detail
The complete notation is normally written MD290T18.5G/22P.
- MD290 = drive series
- T = three-phase 380–480 V class
- 18.5 = general-type applicable motor rating in kW
- G = general type
- 22 = fan/pump applicable motor rating in kW
- P = fan/pump type
A suffix such as B or -INT can materially change the exact ordering configuration. The international documentation, for example, identifies MD290T18.5G/22P-INT as an international variant.
Application Scenarios & Pain Points
Industrial Pump Systems
The 22 kW P-class rating makes this drive applicable to pump applications where controlled acceleration, speed regulation, and energy-conscious operation are required. The motor nameplate still needs to be checked against the drive’s actual current requirement.
HVAC and Process Fans
Large ventilation and process-air systems commonly benefit from variable-speed control. For this model, the 22 kW rating is the relevant fan/pump designation — do not use the 22 kW figure to size an arbitrary constant-torque load.
Water Handling Equipment
Pump skids, circulation systems, booster equipment, and process-water applications can use the MD290 platform where the motor and load profile fall within the drive’s ratings.
Legacy VFD Replacement
When replacing an existing MD290 drive, compare the complete model string, not just “18.5 kW.” The G/P rating split, braking-unit configuration, output-reactor variant, and regional suffix can change the actual hardware configuration.
QA & Live Testing SOP
A drive that powers up is not necessarily a usable spare. For an , the acceptance test should cover the power stage, keypad/control interface, and motor output.
1. Identity Verification
- Photograph the complete nameplate.
- Confirm .
- Record the full suffix, if present.
- Record serial number and manufacturing information.
- Verify the voltage class is three-phase 380–480 VAC.
2. Physical Inspection
- Check the enclosure for impact damage.
- Inspect power terminals for cracking or overheating.
- Inspect the cooling fan and airflow path.
- Check control connectors and communication interfaces.
- Look for evidence of previous power-stage repair.
3. DC-Bus and Power-Stage Inspection
Use an appropriately protected test environment.
- Verify input phase balance.
- Check for abnormal DC-bus behavior.
- Inspect for ground faults or obvious power-stage abnormalities.
- Confirm no abnormal fault appears during controlled startup.
4. Motor Test
Connect a correctly sized test motor and verify:
- Start/stop response
- Forward/reverse behavior where configured
- Frequency reference tracking
- Output-current behavior
- Acceleration/deceleration
- Stable operation across representative speeds
- Fault response
The published MD290 documentation explicitly warns about electrical hazards and requires proper ESD procedures when handling the drive.
5. Packaging
- Use ESD-safe packaging for the control electronics.
- Protect power terminals from impact.
- Prevent moisture exposure.
- Keep the cooling path and fan area free from conductive debris.
Field Engineer’s Pitfall Guide
❗ Do not size the drive from kW alone. The actual motor full-load current must remain within the drive’s applicable output-current rating. The 22 kW designation applies to the P-class fan/pump application; it does not mean every 22 kW motor/load combination is automatically suitable.
❗ Do not confuse 18.5G/22P with 15G/18.5PB. These are different MD290 configurations. The model code carries both the motor rating and application class.
❗ Check the B suffix. The documentation uses the B designation for a built-in braking-unit configuration. Do not assume that a drive listed simply as .5G/22P has the same braking hardware as an .5G/22PB.
❗ Check the suffix after the core model. An international -INT version and other variants may carry different certification or configuration details. Match the physical nameplate to the replacement requirement.
❗ Do not overlook input current and protection sizing. The documented P configuration shows 59 A rated input current and the installation guide specifies associated cable, breaker, contactor, and fuse recommendations. These values should be checked against the actual installation rather than copied blindly from a catalog.
Intent-Driven FAQ
What is Inovance .5G/22P?
It is a three-phase 380–480 VAC variable-frequency AC drive in the Inovance family, rated for 18.5 kW general-duty motor applications and 22 kW fan/pump applications.
Is .5G22P the same as .5G/22P?
The slash is commonly omitted in commercial listings. The documented model format is . Always compare the actual nameplate before ordering.
What is the output current?
The documented P configuration has a 45 A rated output current. The example nameplate specifies 0–480 VAC output and 0–500 Hz output frequency.
What input voltage does it require?
The .5G/22P belongs to the three-phase 380–480 VAC voltage class. The published specification gives an operating tolerance of -15% to +10%.
Is the drive suitable for a 22 kW pump motor?
The model is specifically assigned a 22 kW fan/pump application rating, so it is intended for that class of application. Final selection still requires checking the motor nameplate current, load characteristics, acceleration requirements, and site electrical conditions.
Does .5G/22P have a built-in braking unit?
That depends on the exact suffix. Inovance documentation distinguishes versions with the B designation for a built-in braking unit. Verify the actual model suffix rather than assuming the braking configuration.
What should I verify before buying a replacement?
Confirm the complete nameplate, voltage class, G/P rating, B braking-unit designation if applicable, regional suffix, serial/revision information, and the motor’s actual full-load current. For a production replacement, also verify mounting dimensions, incoming protection, cable sizing, control wiring, and parameter backup before taking the existing drive offline.
