Category: TMEIC

The high-speed switching coupled with the three- level power bridge design

delivers a smooth sine wave to the motor and power system.

Bringing Reliable Control To System Applications

High-power, precision-controlled processes are ideally suited for the TMdrive-70e2

with its efficient high current IEGT power devices and control cards common to

the drive family. Flexible arrangement of converter, inverter and cooling units

allows for maximum power density, resulting in minimum floor space, and

installation cost.

Coordinated drive systems are an integral part of numerous manufacturing processes

in the metals industry. TMdrive system drives address all of these applications with

a robust control platform and a common Microsoft Windows based tool. The tool

supports local and remote connectivity, and is an invaluable asset for system and

process analysis. Due to its high reliability, simplicity of design and high efficiency,

the TMdrive-70e2 is perfect for compressor, fan and pumping applications.

It provides accurate speed control and high efficiency while eliminating

the need for high maintenance mechanical flow control devices. The TMdrive-70e2

is also well suited for applications like grinding mills and mine hoists, where high

overloads and impacts are a part of everyday operations.

IEGT Technology Dramatically Lowers Cost of Ownership

The Injection Enhanced Gate Transistor (IEGT) is a breakthrough

in power switch technology, providing lower cost of ownership.

Features

•  Low Voltage Gate Drive Given that the IEGT is a MOS structure, it can

be gated (turned on/off) with ±15 V

•  Minimal Snubber Circuitry With the high dV/dt capability of the IEGT,

there is only need for a small dc clamp snubber circuit.

•  High-Speed Switching The IEGT is switched at a rate of 500 Hz in this

application.

Benefits

•  High Efficiency and Small Size

A very compact phase leg assembly is achieved with:

• A reduction in snubber circuitry

• Integral forward diodes

• Integral clamp diodes

•  Higher Performance

The TMdrive-70e2 is a new version of the popular TMdrive-70.

The drive offers 4kV class output, and is suitable for induction or

synchronous motors. The drive features:

•  Smaller size

•  Lower weight

•  Additional safety features

The new drive provides the same excellent benefits as the original:

• High reliability

• Regenerative converter

• Simple configuration and maintenance

• High energy efficiency and low cost of ownership

System Applications for the TMdrive-70e2 include:

• Main drives for hot strip steel mills

• Main drives for Cold Mills

• High power drives for compressors, fans, pumps, grinders and mine hoists

kilowatts and kVARs

What is a kilowatt?  kW is the accepted measure of the real energy consumed by any process.  It is the product of volts and the

part of the total amps flowing that does real work, divided by 1000.  This current is called “real” current, and flows in phase

with the voltage.  This includes the “work” that produces heat in the cables and power delivery gear.

Describing “What is a kVAR?” is a little more difficult.  A kVAR is the accepted measure of reactive power, equal to the product

of the volts and the part of the current that is “reactive” divided by 1000.  Reactive current is the current that flows out of

phase with the supply voltage.  Reactive current supplying motors lags in time behind the voltage and the real current, as in A

below.  Reactive current that supplies capacitors leads in time ahead of the voltage and the real current, as in B below.  Lagging

reactive current magnetizes motors and transformers.

The real power (kW) and the reactive power (kVAR) are related like the legs of a right triangle as in the figure at the above

right. Each of the sides is shown as an arrow, called vectors. Since they are at right angles, they cannot simply be added together.

The longer vector (kVA) represents the total current (amperes) and the load on the system. The ratio [kW / kVA] of real power

(kW) to apparent Power (kVA) is called the power factor (pf).  The angle shown as A is the power factor angle.  If all kVAR were

eliminated, the apparent power (kVA) and real power (kW) would be equal and the power factor would be unit or 1.00.

Let’s focus on the TMdrive-MVe2’s Exceptional by Design™ feature:  Built-in Reactive Power Control

All Variable Frequency Drives (VFDs) provide motor speed control (with potential energy savings and improved process control),

and some degree of motor protection.  Voltage-source VFDs (typically with diode rectifiers and capacitor DC link) isolate the

poor power factor of their connected motors from the utility.  For example, a motor with a power factor of .82 lagging would

have its power needs met by the output of the VFD, while the input reflects a much improved power factor of (typical) 0.95

lagging.

TMEIC’s TMdrive-MVe2 VFD input converter is configured with a unique “Active Front End” that uses active switches in place of

diode rectifiers.  This allows the converter of the VFD to hold unity power factor at its input terminals.  But the TMdrive-MVe2

and control goes beyond that and can actually correct the system Power Factor demands of other nearby utility loads without

adding capacitors.

Utility Plant Power

Typical Industrial loads such as shown in the one-line below consist of motors for plant processes, special equipment unique

to the facility, and other loads such as plant lighting and HVAC.  In AC systems, the current that flows is divided into two

components, real power measured in kiloWatts (kW) and reactive power measured in kilovars (kVARs).  Both types of power

draw current (amperes) from power delivery equipment such as transformers, cable, and switchgear.  Current flow results in

voltage drop, heating and wasted energy.

Exceptional by Design™

Built-in Reliability and Performance

What makes the TMdrive-MVe2 Exceptional by Design™?

• Very High Reliability – 15 year MTBF

• Simple design

• Clean power to the utility system & motor

• Built-in Reactive Power Control

• Minimal spare parts

• Long-life film capacitors

• 24 hour x 365 day live support in North America

• Remote Connectivity troubleshooting built-in

The real power (kW) and the reactive power (kVAR) are related like the legs of a right triangle as in the figure at the above

right. Each of the sides is shown as an arrow, called vectors. Since they are at right angles, they cannot simply be added together.

The longer vector (kVA) represents the total current (amperes) and the load on the system. The ratio [kW / kVA] of real power

(kW) to apparent Power (kVA) is called the power factor (pf).  The angle shown as A is the power factor angle.  If all kVAR were

eliminated, the apparent power (kVA) and real power (kW) would be equal and the power factor would be unit or 1.00.

nv Series Controller

The nv Series Controller combines high-speed performance, integrated I/O,

and a unified hardware-software platform to deliver reliable, secure automation

for both process and factory environments.

Unified Control with High-Speed, High-Reliability Performance

The nv Series Controller streamlines automation by integrating multiple controller

types into a single, high-performance platform featuring a common I/O system.

With TC-net I/O and high-speed serial communication, it supports duplex loop

configurations at 100 Mbps, delivering exceptional reliability and fast response

times. Its unified hardware design and optimized software ensure robust operation,

compact installation, and secure control across process and factory automation

environments.

Features and Benefits

• Design Feature

• High speed and high reliability.

• Common platform and software optimized by control field.

• High-speed serial I/O system, TC-net I/O.

Customer Benefit

• Integrated I/O with TC-net I/O results in compact field I/O systems.

• The unified design of hardware improves design quality, while optimized software

assures high reliability and security.

• High-speed serial I/O system and TC-net I/O is the first field I/O system that permits

duplex loop configuration at a transmission rate of 100 Mbps.

Specifications of TMdrive-30 and TMdrive-P30

Features

(1) High performance and high reliability

Use of a large capacity IGBT improves the reliability, reduces the switching loss, and improves the control

performance. The control circuit uses a newly developed power electronics equipment control processor

PP7 and an eight-layered surface mounting circuit board, ensuring high component integration and high

reliability.

(2) Highly precise speed control (TMdrive-30)

Use of totally digital and vector control ensures highly precise speed control and high speed response.

(ωc = 60 rad/s, ωc = 20 rad/s for speed sensor-less control)

(3) Transient response and stability

Use of totally digital and vector control makes it possible to ensure stable operation characteristics

including the transient status.

(4) Quadrantal operation (TMdrive-30)

Quadrantal operation, normal, reverse, power running, and regenerative operations are made smoothly.

(Note: This feature applies only when the reverse-parallel thyristor converter (TMdrive-T30) or IGBT

converter (TMdrive-P30) is used.)

(5) Supporting various speed sensors (TMdrive-30)

Drives a squirrel-cage induction motor. A pulse generator or high-resolution brushless resolver can be

used as a speed detector installed in the motor. Speed sensor-less vector control is also possible.

○ Interfaces

For the connections with external equipment, read “3 Interface”.

○ Concept of control

To know how this equipment performs variable speed control over motors, read “5 Operation”.

○ Startup and operation of equipment

For the procedure for preparations before starting the equipment and how to operate the equipment

independently on an experimental basis or how to check the operation status during line operation, read “1.4

Operation”.

○ Maintenance

For the inspection points to keep the equipment in optimal conditions and cautions on handling internal parts,

read “6 Usage Notes”.

○ Fault and recovery

For action to be taken in the case of any fault in the equipment, read “8 Fault and Recovery”.

○ Spare parts

For spare parts for emergency replacement, read “6.5 Recommended Spare Parts”.