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3 Phase Static (FIXED) Voltage/Frequency Converter (400KVA)


SPF series




- Three Phase: 400KVA

Made in:

Taiwan, ROC

•  Voltage and / or Frequency Conversion • Sophisticated Instruments
• Power Conditioning & Freq. Stabilization •  TV & Radio Broadcasting Stations
•  Factory Automation Equipment •  Option: 400HZ APPLICATIONS:
•  Auto-test Equipment     ⇒ Military System Diagnostics
•  Alarm / Security Monitoring Systems     ⇒ Telecommunication Facilities
•  Cellular Sites     ⇒ Avionics, Marine, Missile, Projectile Facilities
•  Export Product Testing     ⇒ Airport Grounding Facilities include
•  Laboratory          Airport Terminal, Control Tower
•  Medical Equipment     ⇒ Navigation
•  Precise Measuring & Testing Equipment     ⇒ Any Facilities / Instruments have
•  Sophisticated Monitoring Systems          400Hz frequency Power System




USA Military/INDUSTRIAL Grade Power System !
Full Digital and Intelligent AC Voltage / Frequency Converter (CVCF)
Power Conditioning & Frequency Stabilization
High Efficiency, Optimum Stability, and Superior Heat Dissipation
Complete Input to Output True Galvanic Isolation design
Reliable Input Protection

Customizations Welcome


Please contact us, we will welcome the opportunity to review your problems

  and provide you with necessary solutions.
Protection against Detaching and Floating of the Input Power Supply
EMI Suppression
BATTERY added for UPS Backup (Option)
Diagnostic Panel with LCD and LED Display
+/-20% Wide Input Voltage Range
Multi CPU Design and Software / Hardware Cooperate Control
Modular Design PCB with color management Indicators
Plug & Play Modular design for Quick Maintenance and Troubleshooting
Tolerate Harsh Environment
Base with Anchor Bolt Fixing
Intelligent Fan Rotation Rate Control
Reasonable Heat Evacuation Passage Design



Capacity 400 KVA


Input Voltatge (Select One)

3Phase 3Wire+G (Δ): 200 / 220 / 380 / 440 / 460V (Option: 480VΔ / 600VΔ)

3Phase N+G (Y): 200 / 208 / 380 / 400 / 415 / 440V (Option: 480VY / 600VY)

Input Voltage Range ± 20% (> ± 20% is available upon request)
Input Frequency 50Hz or 60Hz or 400Hz (please specify)
Input Frequency Range ± 3Hz (Wider ranges offered, please consult)
Power Walk In 0% ~ 100% : 20 Sec.
Efficiency ≈ 98% 


Output Voltage (Select One) 

3Phase 3Wire+G (Δ): 200 / 220 / 380 / 440 / 460V (Option: 480VΔ / 600VΔ)

3Phase N+G (Y): 200 / 208 / 380 / 400 / 415 / 440V (Option: 480VY / 600VY) 

(Option: ± 10% adjustable from nominal)

Voltage Regulation Rate ± 1% from set point
Frequency (Select One) 

50Hz or 60Hz ± 0.1Hz

 (Option-1: 400Hz ) 

(Option-2: Switch Selectable 50Hz / 60Hz) 

(Option-3: Frequency Adjustable ± 10% from nominal)

Frequency Stability ± 0.1Hz (Crystal Controlled, Free Running)
Output Wave Form  Pure Sine Wave 
Output Power Factor  0.8
Phase Shift 120±0.5(100% Unbalance Load)
Total Harmonic Distortion < 3% (0~100% Linear Load)
Overload Capacity < 110% Continuous, 125% / 15Mins , 150% / 5Mins , >150% / 30Secs 
Efficiency (100% Load) 95 %
Max. Heat Dissipation  27 KW


Over / Under Voltage Protection Alarm
Output Short Circuit Protection Current Limited and cut-off and fuse and breaker
Overload Protection Auto-shutdown 1 minute. Auto Restore when back to normal
Over Temperature Protection Auto-shutdown
Lightning / EMC Filter  MOV / Input & Output (FCC CLASS A)
Galvanic Isolation Input and Output True Galvanic Isolation


LCD Display Real Time Status, Data or Historical Events, Parameters, Real Time Clock, Inv & Buzzer
LED Display Up to date information (Status) to The User & Audible Alarm


Communication Port

Contact Closure, RS-232 / RS-485, Support to Remote Control Module,

Option: SNMP Card or MobBus protocol


EMI / EMC  EN50091-1,-2, CE Approved
UL (Option) ANS/UL1778, 4th Edition, Rev.July 28’06, CAN/CSA C22.2 #107.3-05.Rev.July’06


Capacity 400 KVA
Size (W*D*H)  2240*1000*1900 mm
Net Weight at I/O 380/220V 3600 kgs


Audible Noise  < 67 dBA at 1 meter
Relative Humidity 0%~90% (Non-Condensing)
Operating Temperature 0~40℃(32~104℉)
Altitude 1500M Above Sea Level

* Remarks:  1.  Different specifications required are available

                    2. All specifications mentioned above are subject to change without prior notice.

Customizations Welcome
Custom input and output voltages and frequencies
50Hz / 60Hz Output Frequency Selectable
Output Frequency Adjustable
10% Output Voltage Adjustable
Single and Three Phase Configurations
400Hz Input and / or Output Frequency
BATTERY added for UPS Backup

The SPF series can be started without an AC source, that is, can be started with battery

power only. This is possible because current limit circuitry is added, preventing the problem

of large inrush current from blowing the battery fuse and damaging the DC capacitors when

batteries are connected to an empty DC bus (before the DC bus is energized).


A supplemental power supply is added to provide redundancy for supplying power to the

static switch, so that there will be AC output no matter what happens to the Frequency Converter.


Reduce harmonic current for 80KVA and above SPM series.

Emergency Stop Switch (EPO)

Be installed outside or nearby the Frequency Converters for stopping the Frequency

Converters output in case of emergency. 


The cabinet can be shock mounted using optional rubber or coil type isolators. This will

enable the unit to withstand shock levels as specified in MIL-S-901.


For portability, the cabinets may be optionally equipped with the base-mounted caster /

leveler set as shown.


Cable entry can be from Front, Side, Rear or Top side


UPSCANTM - Remote Control Panel



A hand held remote display and control module

with LCD and LED display that can monitor up

to 99 Frequency Converters via RS-485 at a

remote distance up to <1,000M (up to 3,000 feet)

GPRS MODEM  - Auto-dialing Module   



In case of abnormal situation, it will automatically

dial to specified service center for help. Multiple

phone numbers can be set and no dedicated line

is required.

UPSCOMTM - 3 Phase PC Monitoring Software  




Can provide real-time three phases information

of  Frequency Converter connected on the line

and monitor 31 Frequency Converters max. with

one PC.

3 Phase SNMP Card   




Can monitor and manage the Frequency Converters

through Web browser and Java applet, providing

simultaneously three phases data acquisition.

Static Frequency Converter :

The static frequency converter used semiconductors to rectify AC source power at source frequency

and voltage into DC power before using an inverter to generate a new AC power at the required

frequency and voltage from the DC power. There are no moving parts except for some cooling fans

in the converter.

Key features are :
1. The input and output are isolated via isolation transformer
2. The output voltage regulation can be stable up to 0.2%
3. The output frequency can be very stable up to 0.01Hz
4. The output voltage and frequency can be variable to suit testing purposes
5. Suitable for indoor application with air-conditioned ambience
6. Compact in size which save space for installation

 1. Install Frequency Converter ahead of loading equipment. No need to re-modify.
 2. Save money. Change of frequency will cause some internal alterations different to original design,
  the manufacturer would refuse to provide free warranty and repair.
 3. In addition to Frequency Conversion, it can work as a Voltage regulator with more accurate and
  consistent voltage regulation rate.
 4. Auto shutdown for overload, over / under voltage, over current, over temperature and short circuit
 5. Economical price if compare to AC Power Source / VARIABLE Frequency Converter. 



between Static Frequency Converter and Rotary Frequency Converter






 Active type IGBT/PWM Motor-Generator

Convert incoming AC power into DC, 

and then convert the DC into

the required output power

Use input power to run a motor, which

produces mechanical energy to spin a

generator, which in turn produced the

required output power

 Capacity 500VA ~ 1000KVA 500VA ~ 500KVA
 Size Compact size

Bigger Size;

Rugged floor mount construction

 Weight Lighter Heaviest




e.g., generally Quieter, Lighter weight, etc.


e.g., Audible Noise, Heavy Weight, Waste Space Factor, etc.

 Output Frequency

Generally fixed (50, 60 or 400 Hz

Output Frequency can be fixed or variable)   

Generally fixed
 Output Transformer Yes Option
 MTBF    > 175,000Hrs

Belted: 20,000 ~ 32,000Hrs

Single shaft: 30,000 ~ 60,000Hrs


No moving parts to wear out or break, 

less or no preventive maintenance 

other than cleaning fans, exhausts   

Preventive maintenance is required, e.g.,

bearing maintenance, belt replacement 

(except single shaft units), 

cleaning air intakes and exhausts

 Preparative Work

Some installation and setup may be required,

but usually less than rotary alternative

 Some installation and setup is required, e.g.,

concrete pad, power circuits

 Crest Factor

Input current has high crest factor that

also caused leading power factor

that increases with load

 Input to the converter motor has lagging

power factor that increases with load

 Active type IGBT / PWM  Motor-Generator
 Response Time 60ms ~ 2ms Slow
 Distortion  Input

Harmonic distortion and noise on the input.

Power is not normally passed to the output 

Harmonic distortion and noise on the input.

Power is not passed to the output


Output harmonic distortion is moderately lower, ≦2%   

Output harmonic distortion is low, < 4% ~ 5%

 Waveform PURE Sine Wave Output  PURE Sine Wave Output
 Impedance Very low output source Impedance  Low output source impedance
 Overload Capacity

High overload capacity.

Typically can withstand 300% of

transient peak current than rated capacity

Can source heavy overload currents

2 ~ 4X for short periods of time, 

depends upon generator windings and

momentum of rotating components.

Overloads generally cause voltage reduction

but not large waveform distortion

 Full Load Efficiency  Approx. 85% ~ 94%

< 6.25KVA units: 60 ~ 65%;

large units: 85% ~ 92%


Varies with load, better with heavy

resistive loads and lower output frequencies

 Varies with load,

better with heavy loads