Technical Specifications
| Model | Integrated machine input current, A | Main motor output power, kW | Main motor output current, A | Fan power (power frequency), kW | Fan current, A |
|---|---|---|---|---|---|
| GD300-01A-7R5G-4-RT | 25 | 7.5 | 18.5 | 0.75 | 2.5 |
| GD300-01A-011G-4-RT | 32 | 11 | 25 | 0.75 | 2.5 |
| GD300-01A-015G-4-RT | 40 | 15 | 32 | 0.75 | 2.5 |
| GD300-01A-022G-4-RT | 56 | 22 | 45 | 1.0 | 3.0 |
| GD300-01A-030G-4-RT | 59 | 30 | 60 | 1.5 | 3.7 |
| GD300-01A-037G-4-RT | 68 | 37 | 75 | 1.5 | 3.7 |
| General parameter | Value |
|---|---|
| Voltage class | AC 3-phase 380V (-15%) … 440V (+10%) |
| Built-in options | R — relay module, T — 220V power transformer |
| Fan/valve power supply | Built-in AC 220V/110V transformer |
| Sensor interfaces | 2× PT100 inputs (temperature), 2× pressure inputs, emergency-stop input |
| Control | Dual PID (temperature + pressure) |
| Communication | Modbus, operates without an external PLC |
| Terminals | Detachable, adaptable to wiring preference |
| Motor compatibility | Synchronous and asynchronous compressor motors |
Advantages and Strengths
- All-in-one integrated machine — the built-in relay and transformer remove the need for a separate fan contactor and step-down transformer in the cabinet, reducing component count and potential failure points.
- Direct power for solenoid valve and operator panel — the AC220V/110V transformer immediately covers the compressor’s peripheral power needs without an additional power source.
- Compressor logic without a PLC — Modbus communication with a touchscreen panel plus built-in control algorithms replace an external controller, lowering total solution cost.
- Precise dual-parameter control — the dual PID regulator on pressure and temperature keeps the compressor running stably without load spikes.
- 7.5–37 kW range covers small and mid-size screw compressors — the typical segment for service stations and small production sites where control-cabinet compactness matters.
Application Areas
- Equipping and retrofitting small and mid-power screw air compressors (7.5–37 kW)
- Replacing a failed factory-original VFD on Asian- or European-made compressors
- Compressor stations at auto service centers, small manufacturing sites, workshops
- Sites where minimizing cabinet component count matters (no room for a separate transformer/contactor)
- Retrofitting older direct-on-line compressors for variable-frequency control
Expert Opinion
Expert Opinion: Vitali Bolucevschi, Chief Engineer, Acvatron, 15 years in the field
“The -RT version is especially convenient when replacing a drive on a compressor whose control cabinet is already full — there’s no need to find space for a separate transformer to power the solenoid valve. But it’s important to note: the -RT series is limited to the 7.5–37 kW range at 380V. If the compressor’s main motor power is higher, you’ll need the base GD300-01A series without the integrated design, or a different INVT lineup. That’s why I always check the compressor’s motor power against the -RT model table before ordering, rather than relying on the series name alone.”
FAQ
What’s the difference between GD300-01A-RT and the base GD300-01A?
The GD300-01A-RT is an “integrated machine” version with a built-in relay and 220V transformer for powering the fan and solenoid valve, limited to the 7.5–37 kW range. The base GD300-01A series has a wider power range (up to 500–630 kW) but without an integrated transformer.
Is a separate PLC needed to run the GD300-01A-RT?
No, the built-in compressor logic and Modbus interface allow it to work with an INVT touchscreen panel (e.g., VT6070E) without an external controller.
How do I pick the exact model based on main motor power?
Use the table above: for example, a 22 kW motor requires the GD300-01A-022G-4-RT model — exact power matching is critical, as undersizing will overload the drive.
