Todays deals on Transistor Inverter?

Yaskawa Transistor Inverter CIMR-MTI-7.5K_CIMRMTI7.5K_CIMR-MTII-7.5K ? $2,800.00

LOUIS ALLIS 92064 TYPE L1 10HP 460V TRANSISTOR INVERTER REPAIRED $2,750.00

Yaskawa Transistor Inverter CIMR-MT -11K CIMRMT11K EUJ550S50 JPAC-C061 JPAC-C073 $2,600.00

Toshiba G3 Tosvert-130 VT130G3U4270 Transistor Inverter $2,449.99

TOSHIBA TOSVERT VT130G2+4220 TRANSISTOR INVERTER 22KVA 20HP 30AMP ***XLNT*** $2,399.00

TOSHIBA TRANSISTOR INVERTER VT130G1-222080 $2,250.00

TOSHIBA TRANSISTOR INVERTER VT130G1-4330B0H $2,150.00

TOSHIBA VT130G2U2220 TOSVERT TRANSISTOR INVERTER 22KVA ***XLNT*** $2,199.00

TOSHIBA VT130G304055 TRANSISTOR INVERTER *NICE* $2,000.00

New Toshiba G7 Transistor Inverter VT130G7U4160 $1,999.00

Toshiba H7 True Torque Control 2 – Transistor Inverter Drive VT130H7U4330B $1,690.00

TOSHIBA VT130G3U4080 TRANSISTOR INVERTER *NEW OUT OF A BOX* $1,600.00

TOSHIBA VT130G1-4110BOH TRANSISTOR INVERTER ***XLNT*** $1,549.00

TOSHIBA VFP1-2095UP-B1 TRANSISTOR INVERTER 208/230V ***XLNT*** $1,409.00

YASKAWA VARISPEED 676 TRANSISTOR INVERTER CIMR-11WS $1,400.00

TOSHIBA VT130G2+4080 TRANSISTOR INVERTER, MOTOR DRIVE, 7.5HP 3PH 460VAC NEMA 1 - $1,395.00

Fuji Transistor Inverter FVR-150G7S-4EX 23kVA 30A VARIABLE SPEED DRIVE $967.33

Toshiba VT130G3U4055 Transistor Inverter 5HP Drive VT130G3U4055 $1,295.00

FUJI FRN015G9D-4UX TRANSISTOR INVERTER 15HP ***RFB*** $1,299.00

Toshiba VFS74150UPL 4 Transistor Inverter VFS7-4150UPL4 $1,299.99

NIB YASKAWA CIMR-75A-10 JUSPEED-F TRANSISTOR INVERTER $1,300.00

LOUIS ALLIS 92285 TYPE L1 5HP 460V LANCER JR. TRANSISTOR INVERTER REPAIRED $1,250.00

1 TOSHIBA VT130G2+4080 TRANSISTOR INVERTER Q7-5 $1,189.99

TOSHIBA VFS9-4110PL-WN TRANSISTOR INVERTER 27.7A ***RFB*** $1,149.00

TOSHIBA TOSVERT VT130G1-4080BOH TRANSISTOR INVERTER ***NNB*** $1,099.00

TOSHIBA TOSVERT VT130G1-4055BOE TRANSISTOR INVERTER ***NNB*** $1,099.00

TOSHIBA TOSVERT-130G2+ TRANSISTOR INVERTER 5HP 230VAC $999.99

Toshiba G7 True Torque VT130G7U4015B 1 HP Motor Drive/Transistor Inverter, New $1,040.00

HITACHI VWG16LF3/HFC-VWG TRANSISTOR INVERTER NEW IN BOX $999.00

SUMITOMO AF-500 TRANSISTOR INVERTER AF502-7A5 *NICE* $1,000.00

SUMITOMO AF-500 TRANSISTOR INVERTER AF504-2A2 *NEW* $1,000.00

LOUIS ALLIS 92285 TYPE L1 5HP 460V LANCER JR. TRANSISTOR INVERTER REPAIRED $1,000.00

Toshiba G3 Tosvert-130 Transistor Inverter VT130G3035 AC Drive 3 HP 460VAC $975.00

TOSHIBA TOSVERT VT130G2U2080 TRANSISTOR INVERTER ***XLNT*** $899.00

TOSHIBA TOSVERT VT130G2+4025 TRANSISTOR INVERTER ***NNB*** $899.00

Toshiba VFSXN-2004UP Transistor Inverter VFSX Series $873.00

Toshiba Tosvert VF VFS9-2075PL-WN 10 HP Motor Drive/Transistor Inverter, New $902.00

TOSHIBA VT130G3U4025 TRANSISTOR INVERTER *NEW OUT OF A BOX* $880.00

TOSHIBA VT130G3U4080 TRANSISTOR INVERTER 8KVA 7.5HP **XLNT** $819.00

New Hitachi HFC-VWG Transistor Inverter VFD VWG2.5LD3 3PH 7.5AMPS $799.00

Toshiba VT130 G2U2110 TRANSISTOR INVERTER – New! 10 HP $795.00

Toshiba VFS7-4007UPL Tosvert Transistor Inverter Drive VFS74007UPL $746.00

TOSHIBA VT130G7U4035B TRANSISTOR INVERTER *USED* $765.00

Toshiba VT130G3U2010 Tosvert Transistor Inverter Drive VT130G3U2010 $728.00

TOSHIBA VT130G3U4025 TRANSISTOR INVERTER ***XLNT*** $719.00

TOSHIBA TOSVERT VT130G2+4015 TRANSISTOR INVERTER AC DRIVE 1.5KVA 1HP ***XLNT*** $719.00

Toshiba VF-S11-4055PL-AN Transistor Inverter,3PH-400V $599.00

TOSHIBA VT130G3U4015 TRANSISTOR INVERTER *NEW OUT OF A BOX* $640.00

Toshiba Transistor Inverter VFS-4055PL-WN $625.00

TOSHIBA TRANSISTOR INVERTER VFS11-4037PL-WN(2) *NICE* $600.00

New Hitachi Transistor Inverter VFD VWG2.5LD3 G2LD3 7J2J T22395A7 3PH $599.00

Fuji Transistor Inverter FVR1.5E11S-7JE NIB $590.00

TOSHIBA TRANSISTOR INVERTER VFS7-4037UPL *USED* $580.00

TOSHIBA VFSXN-2004P TRANSISTOR INVERTER VFSXN2004P VFSXN $575.00

Toshiba VT130 G2U2055 • TRANSISTOR/INVERTER – New! 5 HP $575.00

TOSHIBA VT130G2+2010 0.75HP TRANSISTOR INVERTER**XLNT** $529.00

Toshiba VFS7-2037UPL Tosvert Transistor Inverter Drive VFS72037UPL $532.00

VERY NICE TOSHIBA TRANSISTOR INVERTER MODEL ESP-130 $499.00

Toshiba VFS9-2075PL-WN 10 HP Motor Drive/Transistor Inverter, 3 PH, 200/230 Volt $518.00

TOSHIBA VF-S7 3 PHASE 200V 7.5KW TRANSISTOR INVERTER. $388.00

TOSHIBA TOSVERT VT130G2+2015 TRANSISTOR INVERTER AC DRIVE 1.5KVA 1HP ***XLNT*** $479.00

Toshiba G3 Tosvert-130 Transistor Inverter VT130G3U4025 $500.00

NIB YASKAWA CIMR-G08A-20 JUSPEED-F SMALL-CAPACITY DIGITAL TRANSISTOR INVERTER $500.00

YASKAWA CIMR-3.7B.D04 TRANSISTOR INVERTER $500.00

HITACHI HFC-VWS TRANSISTOR INVERTER VWS8HF3UH *NICE* $500.00

Toshiba VT130 G2U4015 • TRANSISTOR/INVERTER – New! 1 HP $495.00

Toshiba Tosvert VT130 G2U2080 • TRANSISTOR INVERTER 7.5 HP Variable Freq – New! $495.00

TOSHIBA VFS9-2007PM-AN TRANSISTOR INVERTER DRIVE VFS92007PMAN $495.00

TOSHIBA VF-S9 3 PHASE 200V 7.5KW TRANSISTOR INVERTER. $388.00

YASKAWA Analog Transistor Inverter CIMR-J04AS3-1 3/4HP $399.00

TOSHIBA TRANSISTOR INVERTER VFS11-4037PL-WN(2) *NICE* $450.00

Toshiba Input/Output Transistor Inverter VFS11-4022PL-WN (5)_VFS114022PLWN_3PH $425.00

Toshiba VFS11-4015PL-WN 2 HP Motor Drive/Transistor Inverter, 3 PH 380/500 V,New $424.00

TOSHIBA VT130G3U2010 .75HP TRANSISTOR INVERTER 3G TOSVERT-130 AC DRIVE ***NIB*** $399.00

Toshiba S5 VFS5-5040UPH Transistor Inverter VFD 3hp NOS $399.99

Toshiba VT130G2+2035 Tosvert Transistor Inverter “NEW” $395.00

LOUIS ALLIS 92288 Lancer Jr 15 Hp 460V TRANSISTOR INVERTER Used $400.00

TOSHIBA VFSXN 2004 UP TRANSISTOR INVERTER W/PANEL UNIT CBVX 7B4 $399.99

TOSHIBA VT130G3U4110 TRANSISTOR INVERTER *USED* $385.00

Toshiba VT130G3U2110 Tosvert Transistor Inverter $350.00

KASUGA KVFH Transistor Inverter KVFH415E 3 kVA $350.00

NIB TOSHIBA TRANSISTOR INVERTER VTI30G1D-2075C1 $339.00

TOSHIBA TRANSISTOR INVERTER Part # VFA3N-2015PY-A3 $325.00

SUMITOMO TRANSISTOR INVERTER AF502-A40 $325.00

10000 MAX 5000w power inverter 24V DC / 190-240V AC- Power Jack – CE, C-tick $329.00

Toshiba 2.2kW Transistor Inverter VFSX-2022UP1 $299.00

TOSHIBA VFA5-2075P TRANSISTOR INVERTER Tosvert VF-A5 $300.00

Toshiba 2hp Transistor Inverter Drive VT130G2+2025 $310.00

976918 – TOSHIBA VFSX-2022UP1 TRANSISTOR INVERTER TOSVE $300.00

Toshiba Tosvert-130 Transistor Inverter Input/Output 460V 7.5 HP $249.99

Toshiba VFS7-4007UPL Transistor Inverter VFS74007UPL $299.00

Tosvert-130G2+ Transistor Inverter VFD .75hp AC NOS New $299.99

USED Toshiba TOSVERT-130 Transistor Inverter 1HP VT130G $300.00

Toshiba VFNC1S-1002P Transistor Inverter .25HP 1.4 Amps $300.00

NIB Toshiba Tosvert VF Series Transistor Inverter 200/230V VFS7-2004P $285.00

TOSHIBA VF-S9 3 PHASE 400V 0.75KW TRANSISTOR INVERTER. $188.00

Sew-Eurodrive, Inc. C2303 Transistor Inverter (New) $250.00

Toshiba Transistor Inverter 4.0kVA VFSX-2022UP1 $250.00

TOSHIBA VT130G3U2010 .75HP TRANSISTOR INVERTER 3G TOSVERT-130 AC DRIVE **XLNT** $219.00

TOSHIBA TRANSISTOR INVERTER VFS7-4015UPL, 3PH, 480-460V $225.00

Transistor Inverter Questions

Comparing Transformer-based and Transformerless Uninterruptible Power Supplies

Choosing between transformer-based or transformerless uninterruptible power supplies may not be a simple ‘either/or’ decision, particularly above 10kVA. Both technologies have their place in today’s power protection scenarios but the key differences between them are: physical size, efficiency, noise output and the levels of input harmonic distortion that they generate.

Both uninterruptible power supply designs produce a tightly regulated source of uninterrupted power but they differ in the way they generate the dc voltage required by their inverters and their output stages.

Transformer-based Uninterruptible Power Supplies: until the early 1990s, the only design of online uninterruptible power supply was transformer-based. Nowadays, the design is still available but generally in larger sizes for UPS from eight to 800kVA. The most common applications for this are large industrial sites.

This type of UPS has a robust transformer-isolated inverter output, which makes it more suitable for the type of application where there is a likelihood of electrical noise; spikes, transients, and potentially, a high degree of short-circuit currents.

The inverter generates an ac supply from its dc power source, which is fed into a step-up transformer. The primary function of the transformer is to increase the inverter ac voltage to that required by the load. The transformer also protects the inverter from load disruption, whilst also providing Galvanic isolation (a method of isolating input and output).

Modern inverter designs use IGBTs (Insulated Gate Bipolar Transistors) in place of more traditional switching components (such as power transistors and thyristors). IGBTs combine the fast-acting and high power capability of the Bipolar Transistor with the voltage control features of a MOSFET gate to form a versatile, high frequency switching device. This in turn has given rise to more powerful, efficient and reliable inverters.

Transformer-based UPS are also supplied with a dual input option as standard, which can be selected at installation by simply removing a linking connector from its input terminal. This allows it to be powered from two separate ac supply sources thus adding further resilience. A transformerless UPS can be installed with dual input capability, with supplies derived from the same source, but this is typically a factory-fit option.

Transformerless Uninterruptible Power Systems

Transformerless UPS is a newer design, commonly available from 700VA to 120kVA. The primary purpose behind the introduction of transformerless units was to reduce the overall physical size and weight thus making an uninterruptible power supply unit more suitable for smaller installations and/or computer room/office type environments, where space may be limited. It also generates far less noise and heat than its transformer-based cousin and has far lower input harmonic distortion levels making it compatible with environments where electronic equipment (such as computers) may be more sensitive to this type of distortion.

In place of the step-up transformer, a transformerless UPS uses a staged process of voltage conversion. The first stage combines a rectifier and booster-converter to generate a dc supply for the inverter. An uncontrolled, three-phase bridge rectifier converts the ac supply into a dc voltage. This is passed through a mid-point booster circuit to step the dc voltage up to typically 700-800Vdc from which a battery charger and inverter are powered. In the second stage, the inverter takes the supply from the booster-converter and inverts it back to an ac voltage to supply the load.

An added benefit of this method is that the rectifier can operate from either a three or single-phase input supply. This can be configured at installation for systems up to 20kVA. A control system ensures a stable, regulated dc voltage is supplied to the inverter at all times and the inverter can operate regardless of UPS output load variations or mains power supply fluctuations or disturbances.

Choosing between Transformer-based or Transformerless Uninterruptible Power Supplies

In many applications the choice between the two may be clear. It is where the two ranges overlap, in terms of power rating, that the decision is more complicated. Consideration needs to be given then to: initial purchase cost, physical size, running costs, the installation environment, and in particular, the levels of input harmonic distortion they generate. Both designs can be operated in parallel to achieve higher levels of availability and resilience.

Over the last decade, the gap between these two uninterruptible power supply technologies has reduced as manufacturers have applied common techniques and research & development efforts to both designs. The driving force behind this has been cost and size, alongside demands to improve operating efficiency and reduce harmonic generation. In terms of online performance, both designs provide the same level of performance and are classified as VFI systems (voltage and frequency independent – in accordance with EN/IEC 62040-3). Their principal differences are their effects on upstream supplies and the operating environment.

Transformerless UPS are generally recognised as more efficient and having a higher power factor than an equivalent transformer-based design, therefore operating costs can be lower.

Below 10kVA, the transformerless UPS design dominates the online uninterruptible power supply market and has become the standard within data centre environments as they offer a more compact footprint, higher operating efficiencies and lower noise output. However, the strengths of the transformer-based design come into play in the industrial environment.

About the Author

Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com

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