With the MTC2 R7, SCHLEICH redefines speed and precision in surge test and partial discharge testing – no other test device offers more performance and versatility.

It utilizes the latest hardware technologies paired with state-of-the-art .NET Core software. This significantly increases the accuracy of individual test methods and measurement speed.

All components are housed in a specialized, robust industrial housing. The sensitive measurement technology within the housing is additionally protected from impacts and vibrations by shock absorbers.

No matter how good a test device may be, it must also seamlessly integrate into an existing infrastructure. Therefore, the Connection panel of the MTC2 R7 in the standard version is discreetly recessed on the side, making it easily accessible. Whether you operate the device on a table or standing on the floor, all Connections are conveniently accessible at all times.

The workshop housing is based on the all-round housing and is additionally reinforced with solid aluminum plates on the lid and base. The sturdy, Flip-up front cover protects the control panel and the display from damage during transport.

Connection cables, terminals, and additional Accessories can be stored in the Accessory bag, which is attached to the lid of the device.

As with the standard housing, the sensitive measurement technology within the housing is additionally protected from impacts and vibrations by shock absorbers. Even hard impacts are reliably absorbed by our specialized damping technology.

The device in the workshop housing additionally features a built-in LED warning light.

The Flip-up front cover is secured with snap fasteners for transport. If required, it is quickly and easily removable.

The Accessory bag accommodates Connection cables, terminals, and additional Accessories.

For the desktop and 19” rack mount devices, all Connections are located at the rear. This allows the MTC2 R7 to be easily and conveniently integrated into a 19” rack.

For remote control, these device variants come standard with an additional PLC GO-Interface. Furthermore, the devices can be expanded with additional interfaces and fieldbuses.

Everything revolves around the device under test:
The new software has been completely revised and is based on modern .Net technology. The MTC2 R7 features modern and clear displays that enable intuitive operation. To ensure touch operation in mobile use or in the workshop, many settings can be displayed larger. In conjunction with a large touch keyboard, the software can thus be conveniently operated even without a mouse and keyboard.

The device under test memory provides an optimal overview of each created device under test. In addition to an overview of the individual assigned parameters such as manufacturer, serial number, and type, all test results are also displayed.

Any number of devices under test/device under test types can be created in the software. Additional information can now be assigned to these:

• Nameplate Information
• Images of the nameplate or the device under test 
• Location Information
• Logbook entries for documenting any information
• Multiple test plans, e.g.:
  Incoming test
  Outgoing test
  Type test
• test results

With the five test leads of the MTC2 R7, all relevant winding Connections can be contacted simultaneously. The three phase Connections and the star point (if present and accessible) are connected with four test leads. The fourth test connection at the star point provides a unique increase in test accuracy. The fifth test connection is connected to the stator/electric Motor housing. It is required for the insulation test between the winding and the laminated core.

Do you generally need more than four test connections, e.g., to contact additional sensors or unconnected devices under test? Then an extension of the MTC2 R7 to a total of eight measurement connections + body is possible.

The automatic test method switch-over

After connecting the device under test, the MTC2 R7 automatically tests all five terminals. The built-in test method switch-over eliminates the need for manual re-Connection of the Connections. Our test method switch-over ensures a fast and automatic change between different test methods. As the voltage differences between test methods can be very large, the reliability of the switch-over is paramount. A Resistance test with 3 V is switched to the device under test just as reliably as a high voltage test with 15 kV. Without compromise!

For devices under test with multiple Connections, it is more economical to connect all Connections of the device under test immediately to the test device. The test device then fully automatically runs all tests between all Connection points. This procedure reduces the required cycle time and thus the cost of a test, and avoids errors. The switch-over between the various Connections is realized by flexible switching matrices.

Partial Discharge Test during surge test

– Optional Extension –

The partial discharge test is used to verify the winding quality of winding goods. Essentially, it aims to detect quality defects in windings that are not detectable with conventional high voltage test or surge test alone.

The coupling technology, combined with high-frequency filter technology, makes the system extremely robust against interference. Therefore, it is ideally suited for use in the field or in manufacturing.

The test is run either manually or fully automatically. In manual operation, the operator increases the voltage while observing the partial discharge signal. 

Automatic operation enables the fully automatic analysis of all three phases via a test sequence. The following values are determined per phase: 

• PDIV (Inception Voltage) 
• PDEV (Extinction Voltage)
• RPDIV (Repetitive Inception Voltage) 
• RPDEV (Repetitive Extinction Voltage) 

It is not necessary to run the entire ramp. If a quick distinction between GO and NOGO is required in production, the patented 50 Hz high-speed test can optionally be run. Alternatively, a fixed test voltage can be used.

Insulation Resistance Test

The insulation resistance test built-in to the base device is specialized for testing electric drives. The test voltage is automatically switched to the test lead, which is also used for the surge test and Resistance test. Re-clamping on the device under test during individual measurements is not required. The switch-over occurs fully automatically up to a test voltage of 50 kV within the test device.

The software offers pre-configured test sequences for PI, DAR, High Voltage DC, MegaOhm, and step voltage. In conjunction with the new fully automatic ramp time determination, operation has been significantly simplified. To optimally configure the test device for specialized applications, all parameters can also be set separately. These include the following functions:

• Separate current limits during the ramp phase and test phase
• Contact control via minimum current monitoring
• Temperature compensation of the insulation resistance according to IEEE Std 43

Insulation resistance test with ramp

Typically, the ramp time is manually defined and set individually for each device under test. However, it must be ensured that maximum charging currents are not exceeded. 

Thanks to the automatic charging current detection included in the scope of delivery during the initial phase of the ramp function, the MTC2 R7 determines the shortest ramp time.

Of course, it is still possible to parameterize the ramp function custom. For this, the ramp duration is selected, and the maximum permissible charging current is set as the evaluation criterion.

• Automatic charging current detection for minimum ramp time
• Ramp and test time adjustable
• Graphical representation of current, voltage, and insulation resistance in a diagram
• Discharge after the test is displayed and protocolled

Resistance test

The MTC2 R7 is equipped with a Resistance test even in its base version. This allows for the testing of phase resistances, temperature sensors (NTCs, PTCs, and KTYs), and individual coils without the need to re-clamp the test leads. Thanks to the built-in test method switch-over, the test is run immediately and fully automatically via the test leads already connected to the device under test.

Temperature compensation

• Temperature sensor Connection directly on the device
• Connectable sensors:

• • Room temperature sensor
  • Object temperature sensor
  • Pyrometer
  • Hygrometer and barometer

• Three independent input signals, each with 0 – 10 V or 4 – 20 mA
• Measurement range 0 – 100 °C (32 – 212 °F)
• Reference temperature adjustable
• Fully automatic compensation of resistance values for copper, aluminum, and temperature sensors

Inductance and capacitance test

– Optional extension for Resistance test –

The use of a capacitance measurement bridge is a thing of the past. Utilize the measurement bridge optionally built-in in the MTC2 R7 for high-precision measurement of inductances, impedances, and Capacitances.

The following evaluation options are available:

• Comparison of the Actual value to a specified set value
• Determination of the symmetry (scattering range) of all three phases

AC High Voltage Test

– Optional Extension –

The AC high voltage test can be built-in into the MTC2 R7 and is immediately automatically switched to the measurement terminals. Re-Connection is not necessary. The test is performed fully automatically via the measurement leads already connected to the device under test.

Due to the built-in high voltage test, this extension is only available in the 19” or desktop version. The device thus expands to 10 HM.

Rotating field test

– Optional Extension –

With the help of the sense of rotation test, the rotating field of a stator can be measured and evaluated. The test is performed contactlessly with a rotating field probe, which is placed into the stator or mounted on a device under test holder.

The rotating field is generated by an electronic source that simulates the 3-phase supply of the electric motor. With this test, Connection errors in manufacturing can be detected even before the assembly of the electric motor.

All test results can be output on the modern standard protocol either directly after testing or at a later time. The language of the protocol can be custom selected before output. Protocolling is performed according to IEC 61934. German, English, Chinese, Danish, French, Italian, Dutch, Polish, Portuguese, Swedish, Slovenian, Spanish, Czech, and Hungarian are stored as standard languages.

Test plans and test results can be saved locally or alternatively on a central server. This ensures high data safety and optimal data exchange between different test systems.

The MTC2 R7 operates optimally in all network infrastructures even in its standard configuration. This feature provides the ideal platform for collecting, managing, analyzing, and distributing information.

All device under test data, test plans, test results, and operator information can be efficiently synchronized across multiple test devices. This ensures that each test device or desktop workstation is always up-to-date, eliminating the need for data exchange via an additional data carrier.

The workstation software provides a comprehensive overview of all test results at any time. Test plans can be conveniently edited from the office workstation.

Utilize the extensive configuration options to define which data, operator access, and results are designated for which test system and which are not.

The software allows the test device to operate even without a network connection. This ensures continuous testing. This is necessary, for example, in the event of a network failure or for field use.

The VoltageAnalyzer

The VoltageAnalyzer is used for the measurement of surge test signals directly on the electric motor winding. Its frequency response covers the space from DC up to very high pulse frequencies in the MHz space. This makes the VoltageAnalyzer ideal for high-precision surge test and partial discharge measurements. The VoltageAnalyzer measures voltages and voltage peaks directly where they occur. This can be, for example, in the electric motor at the motor terminal board or directly at the winding Connections.

Voltage measurement during surge test and partial discharge

It can happen that the voltage measured internally in the surge tester does not exactly match the voltage at the device under test. This is because the unavoidable line inductances and Capacitances in measurement leads between the measurement leads can alter the voltage profile of the surge impulse on its way to the device under test. This effect becomes more pronounced the steeper the surge impulse rises.

To accurately measure the partial discharge inception voltage actually present at the electric motor terminal board during a partial discharge test, for example, a measurement with the VoltageAnalyzer directly at the terminal board is therefore required.

The armature booster

For testing armatures, an additional armature booster is available for the MTC2 R7 test device. This is required for testing larger, low-inductance DC armatures. The armature booster increases the surge current by a factor of 10 to detect short circuits and insulation faults between the bars.

The armature booster is connected to the test leads of the MTC2 R7. At the output of the booster, two solid test tips are available to the operator. Additionally, a built-in warning light indicates whether the terminals are de-energized. An acoustic signal indicates whether the test result is GO or NOGO.

All Facts at a Glance

Test devices with 6, 12, 15, 30, 40, and 50 kV surge test