VFD550I Electro-Hydraulic Servo Drive
VFD550I is an electro-hydraulic drive that turns pressure and flow commands into motor control for injection-moulding and hydraulic machinery. It supports induction and permanent-magnet motors, with open- or closed-loop operation according to feedback hardware. Selection depends on continuous current, pump duty and the chosen I/O/encoder board, not motor kW alone.
Technical specifications
Ratings refer to the linked document revision. Confirm the nameplate, motor current and operating conditions for the exact selection.
Motor and process control
| Motor compatibility | Induction and permanent-magnet synchronous motors are supported. PDF p. 4 |
|---|---|
| Control modes | V/f, sensorless vector (SVC) and feedback vector control with a PG card (VC). PDF p. 9 |
| Frequency by control mode | Frequency ranges: V/f 0–600 Hz, SVC 0–200 Hz, VC 0–400 Hz. PDF p. 9 |
| Speed range | Speed range: V/f 1:100; SVC 1:200; VC 1:1000. PDF p. 9 |
| Speed accuracy | Speed accuracy: V/f ±0.5%; SVC ±0.2%; VC ±0.02%. PDF p. 9 |
| Speed response | Speed response: V/f 5 Hz; SVC 20 Hz; VC 50 Hz. PDF p. 9 |
| Hydraulic performance | The brochure states 20 ms pressure response, overshoot ≤+1% and steady fluctuation ≤±0.5 bar; these must not be presented as a guarantee for every machine. PDF p. 6 |
| Acceleration / deceleration | Four acceleration/deceleration groups; linear or S-curve, 0–60000 s. PDF p. 9 |
Electrical ratings
| Supply options | For the 380 V class: three-phase 380–480 V input, allowed variation −15% / +10%. PDF p. 9 |
|---|---|
| Supply frequency | 50/60 Hz supply; frequency variation below 5%. PDF p. 9 |
| Output voltage | Three-phase output voltage ranges from zero to input voltage. PDF p. 9 |
| Switching frequency | Carrier frequency: 1–12 kHz depending on model. PDF p. 9 |
Technical specifications
| Overload capacity | 150% rated output current for 60 s; the performance section additionally states 180% for 10 s. PDF p. 7PDF p. 9 |
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Communication and options
| Communications | The current brochure lists Modbus and CANopen; confirm the board/hardware configuration. PDF p. 7PDF p. 9PDF p. 10 |
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Control inputs and outputs
| Input configuration | Current brochure: five digital inputs including one pulse input up to 100 kHz; three analog inputs. PDF p. 9 |
|---|---|
| Analogue output | Analogue output: 0–10 V or 0–20 mA. PDF p. 9 |
Operation
Technical specifications
| Incremental encoder board | MT500-PG-INC3: differential input up to 500 kHz, open collector up to 150 kHz; no UVW differential input or frequency-division output. PDF p. 8 |
|---|---|
| Resolver board | MT500-PG-RT1 resolver card: 7 Vrms / 10 kHz excitation, female DB9. PDF p. 8 |
Commissioning and operation
| Pressure / flow connections | Pressure command connects to AI1, flow command to AI2 and pressure feedback to AI3. PDF p. 5PDF p. 6 |
|---|---|
| Power connections | Connect supply to R/S/T, motor to U/V/W and protective earth to PE; never feed mains into the output. PDF p. 5 |
Protection functions
Model and dimension tables
Check the units and document revision in each table. Wide tables can be scrolled horizontally on small screens.
Model and current options
Evaluate pump duty, motor nameplate current, pressure/flow commands and the feedback board together.
| Model code | Supply / voltage class | Motor power | Rated output current | Source |
|---|---|---|---|---|
| VFD550I-5A6-T4B | 3 phase, 380 V | 2.2 kW | 5.6 A | PDF p. 8 |
| VFD550I-9A4-T4B | 3 phase, 380 V | 4 kW | 9.4 A | PDF p. 8 |
| VFD550I-13A-T4B | 3 phase, 380 V | 5.5 kW | 13 A | PDF p. 8 |
| VFD550I-17A-T4B | 3 phase, 380 V | 7.5 kW | 17 A | PDF p. 8 |
| VFD550I-25A-T4B | 3 phase, 380 V | 11 kW | 25 A | PDF p. 8 |
| VFD550I-32A-T4B | 3 phase, 380 V | 15 kW | 32 A | PDF p. 8 |
| VFD550I-37A-T4B | 3 phase, 380 V | 18.5 kW | 37 A | PDF p. 8 |
| VFD550I-45A-T4B | 3 phase, 380 V | 22 kW | 45 A | PDF p. 8 |
| VFD550I-60A-T4B | 3 phase, 380 V | 30 kW | 60 A | PDF p. 8 |
| VFD550I-75A-T4B | 3 phase, 380 V | 37 kW | 75 A | PDF p. 8 |
| VFD550I-90A-T4B | 3 phase, 380 V | 45 kW | 90 A | PDF p. 8 |
| VFD550I-110A-T4B | 3 phase, 380 V | 55 kW | 110 A | PDF p. 8 |
| VFD550I-152A-T4B | 3 phase, 380 V | 75 kW | 152 A | PDF p. 8 |
| VFD550I-176A-T4B | 3 phase, 380 V | 90 kW | 176 A | PDF p. 8 |
Enclosure and mounting dimensions
Compare the full product code and enclosure drawing before installation. Dimensions can differ between hardware revisions.
| Scope | Width | Height | Depth | Mounting pitches | Hole diameter | Source |
|---|---|---|---|---|---|---|
| Frame A | 100 mm | 215 mm | 170 mm | 87 × 206.5 mm | 5 mm | PDF p. 4 |
| Frame B | 130 mm | 250 mm | 180 mm | 113 × 239.5 mm | 5 mm | PDF p. 4 |
| Frame C | 170 mm | 310 mm | 193 mm | 153 × 299 mm | 6 mm | PDF p. 4 |
| Frame D | 210 mm | 370 mm | 205 mm | 165 × 350 mm | 6 mm | PDF p. 4 |
| Frame E | 260 mm | 452.5 mm | 230 mm | 218 × 438 mm | 7 mm | PDF p. 4 |
| Frame F | 320 mm | 555 mm | 275 mm | 250 × 535 mm | 10 mm | PDF p. 4 |
| Frame G | 350 mm | 640 mm | 290 mm | 280 × 620 mm | 10 mm | PDF p. 4 |
Document revision and selection notes
Important note 1
The manual explicitly lists frame-G dimensions for 75 kW / 152 A; do not assume the same dimensions for 90 kW / 176 A without checking the supplied unit.
PDF p. 4
The brochure has 1 AO + 1 digital/pulse output; the manual diagram shows AO1/AO2 and DO1/HDO
The brochure has 1 AO + 1 digital/pulse output; the manual diagram shows AO1/AO2 and DO1/HDO. Identify the I/O board before publishing an unconditional count.
PDF p. 9PDF p. 6
Brochure p4 uses ±0.5% stability while p6 uses ±0.5 bar fluctuation; these are not interchangeable metrics.
Brochure p4 uses ±0.5% stability while p6 uses ±0.5 bar fluctuation; these are not interchangeable metrics.
PDF p. 4PDF p. 6
Important note 4
Conflicting/revision-specific document information; confirm the ordered unit: Current brochure I/O table: one digital/pulse output up to 100 kHz, two relays and one analogue output.
PDF p. 9
Manufacturer drawings
Open connection and dimension drawings in the manufacturer’s original PDF. For installation, use the complete manual matching the exact product model.
PDF p. 4
Information needed for selection
Providing the following information helps our technical team select the correct product and accessories.
- What does the complete motor nameplate state: phase, voltage, rated current, power and motor type?
- What starting torque, braking requirement and duty cycle does the load require?
- Will control use terminals, an analogue signal, communications or encoder feedback?
- What are the cabinet temperature, altitude, motor-cable length and available mounting space?
Let us verify your application
For VFD550I Electro-Hydraulic Servo Drive selection, share motor, supply, control, environment and duty-cycle data with our engineering team.