FST-500 Mini VFD Frequency Inverter
The FST-500 mini VFD is a compact frequency inverter supporting 0.4KW to 7.5KW motor control. Featuring sensorless vector control and built-in PID function, this small frequency converter is ideal for pumps, fans, and machine tools in textile, packaging, and food processing industries.
Power range
0.4kw~7.5kw
Input voltage
220V 1 phase to 3 phase
220V 3 phase to 3 phase
380V 3 phase to 3 phase
Product Overview
Application scope
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Textile
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Paper Making
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Sand Making
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Machine Tools
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Packaging
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Food
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Fans
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Pumps
Features
- Compact structure, small size, and light weight
- Multiple protection technologies with strong anti-interference ability
- Can set V/F curve and automatically adjust acceleration and deceleration function
- Low noise, carrier frequency 0-15Khz
- Built-in PID function
- Automatic torque increase and automatic voltage regulation function
- Sleep/wake up function and zero speed hold function
- Built in RS-485 communication interface
Technical Specifications
| Iterms | Specifications | ||||||||||||
| Output | Rated voltage | 220V | 380V | ||||||||||
| Applicable motor power(KW) | 0.4 | 0.75 | 1.5 | 2.2 | 4 | 5.5 | 0.75 | 1.5 | 2.2 | 4 | 5.5 | 7.5 | |
| Rated Current | 2.5 | 5.0 | 7.0 | 10 | 17 | 25 | 3.0 | 4.0 | 5.0 | 8.2 | 13 | 18 | |
| Power supply | Maximum overload current(A) | 150% 1 minute | |||||||||||
| Control and Operation | Rated input voltage | Single phase / 3 phase 220V; 3 phase 380V±10%; 50-60Hz±5% | |||||||||||
| Rated output voltage | 0-rated input voltage | ||||||||||||
| Control method | Sine wave SPWM, Senseless vector control | ||||||||||||
| Output Frequency | 0.1-400 Hz | ||||||||||||
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Output frequency accuracy (when it is 25±10℃) |
Digital command; max frequency ±0.01% aAnolog command: max frequency ±0.2% | ||||||||||||
| Resolution set to frequency |
Digital command: 0.1Hz Analog command: 1‰ of max frequency |
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| Voltage/frequency feature | Features of constant torque and reduced torque of any V/F features | ||||||||||||
| Features of torque | Torque compensation, slip compensation, starting torque can reach 150% when it is 5Hz. | ||||||||||||
| Features of Acc/Dec | 0.1 second to 600 seconds, the second acc/dec can be adopted (can be set separately) | ||||||||||||
| Frequency input setting | Keyboard Λ, V key and keyboard potentiometer 0 ~ 10VDC (input impedance 20KΩ) 4 ~ 20Ma (inut impedance 250Ω) | ||||||||||||
| Input signal |
Multi speed option 1-7 , inching command, static command of acceleration/deceleration switch command of the first/second acceleration/deceleration, counter, programmable operation, external B.B. terminal setting of incremented/decremented frequency |
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| Input signal |
In operation, operating frequency to the limit, set frequency reach, zero speed, B.B, abnormal indication, Local/Remote indication, indication of count reachable, programmable operation |
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| Analog monitor: output frequency/output current | |||||||||||||
| Protection function |
Overcurrent, overloading, overvoltage, undervoltage, CPU fault, electronic thermal relay protection, overcurrent speed loss and overvoltage speed loss, overheating protection, ground fault when it starts |
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| Other functions |
ACR function, fault retry function, gain adjustment of analog quantity, hop frequency, upper/lower limit of frequency, display of output frequency, fault record monitor, carrier frequency setting, automatic torque boost, automatic slip compensation, PID control |
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Use condition |
Installation | Indoor, altitude lower than 1000 meters, dust-free, no corrosive gas, no direct sunlight | |||||||||||
| Use environment | -10℃ - +40℃ (to bare machine is -10℃ - +50℃), 20% - 90%RH (no condensation) | ||||||||||||
| Vibration | 5.9m/G1 （0.6G）10-55Hz | ||||||||||||
| Storage | -10℃ - +40℃ (to bare machine is -10℃ - +50℃), 20% - 90%RH (no condensation) | ||||||||||||
| Installation method | Wall-mounted | ||||||||||||
| Protection Grade | IP20 | ||||||||||||
| Cooling method | Closed self cooling to 0.4KW, others are forced with air cooling | ||||||||||||
Model Selection Guide
| Model no. | Power | Output current | Input voltage | Size（mm） | Installation size（mm） | G.W |
| FST-500-0R4S2 | 0.4KW | 2.5A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-0R7S2 | 0.75KW | 5A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-1R5S2 | 1.5KW | 7A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-0R4ST2 | 0.4KW | 2.5A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-0R7ST2 | 0.75KW | 5A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-1R5ST2 | 1.5KW | 7A | 220V | 85*153*113 | 80*138 | 1.2KG |
| FST-500-2R2ST2 | 2.2KW | 10A | 220V | 125*235*165 | 110*205 | 3.7KG |
| FST-500-4R0ST2 | 4KW | 17A | 220V | 125*235*165 | 110*205 | 3.7KG |
| FST-500-5R5ST2 | 5.5KW | 25A | 220V | 125*235*165 | 110*205 | 3.7KG |
| FST-500-0R7T4 | 0.75KW | 3A | 380V | 100*164*116.5 | 89*140 | 1.4KG |
| FST-500-1R5T4 | 1.5KW | 4A | 380V | 100*164*116.5 | 89*140 | 1.4KG |
| FST-500-2R2T4 | 2.2KW | 5A | 380V | 100*164*116.5 | 89*140 | 1.4KG |
| FST-500-4R0T4 | 4KW | 8.2A | 380V | 125*235*165 | 110*205 | 3.7KG |
| FST-500-5R5T4 | 5.5KW | 13A | 380V | 125*235*165 | 110*205 | 3.7KG |
| FST-500-7R5T4 | 7.5KW | 18A | 380V | 125*235*165 | 110*205 | 3.7KG |
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