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

The latest hardware technologies are used, paired with state-of-the-art .NET Core software. This significantly increases the accuracy of the individual testing methods and the measurement speed.

All components are housed in a specially designed, robust industrial enclosure. The sensitive measuring equipment is further protected from shocks and vibrations by shock absorbers within the enclosure.

No matter how good a test instrument is, it must also integrate seamlessly into an existing infrastructure. That's why the connection panel of the MTC2 R7 is discreetly recessed on the side in the standard version, making it easily accessible. Whether you operate the device on a table or standing on the floor, all connections are always conveniently reachable.

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

The accessory bag, which is attached to the lid of the device, provides space for connection cables, clamps and other accessories.

As with the standard housing, the sensitive measuring technology inside the housing is additionally protected from shocks and vibrations by shock absorbers. Even hard impacts are reliably absorbed by our special damping technology.

The device in the workshop housing also features an integrated LED warning light.

The hinged front cover is secured with snap fasteners for transport. It can be quickly and easily removed if needed.

The accessory bag offers space for connection cables, clamps and other accessories.

All connections are located on the rear of both the desktop and 19" rack-mounted units. 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 I/O interface. Furthermore... The devices can be equipped with additional interfaces and fieldbuses. to be expanded.

Everything revolves around the object being tested:
The new software has been completely redesigned and is based on modern .NET technology. The MTC2 R7 features modern and clear interfaces that enable intuitive operation. To ensure usability via touchscreen in mobile applications or in the workshop, many settings can be displayed in a larger format. In conjunction with a large touchscreen keyboard, the software can also be operated comfortably without a mouse and keyboard.

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

The software allows you to create any number of test objects/test object types. You can then assign further information to these:

• Type plate information
• Images of the nameplate or the test object 
• Location information
• Logbook entries for documenting any information
• Several test plans, e.g.:
  Entrance examination
  Outgoing check
  Type test
• Test results

The MTC2 R7 's five test leads allow simultaneous contact with all relevant winding connections. Four test leads are used to connect the three phase connections and the neutral point (if present and accessible). The fourth test lead at the neutral point provides a significant increase in testing accuracy. The fifth test lead is connected to the stator/electric motor housing and is used for insulation testing between the winding and the laminated core.

Do you typically need more than four test ports, for example, to connect additional sensors or unconnected test objects? Then the MTC2 R7 can be expanded to a total of eight test ports plus a body.

The automatic test method switching

After connecting the device under test, the MTC2 R7 automatically performs tests at all five terminals. The integrated test method switching eliminates the need for manual reconnection. Our test method switching ensures a fast and automatic change between different test methods. Since the voltage differences between test methods can be very large, the reliability of the switching is paramount. A resistance test at 3 V is switched to the device under test just as reliably as a high-voltage test at 15 kV. No compromises!

For test objects with multiple connections, it is more economical to connect all connections of the test object to the test instrument immediately. The test instrument then performs all tests between all connection points fully automatically. This approach reduces the required cycle time and thus the cost of a test, while also preventing errors. Switching between the different connections is achieved using flexible switching matrices.

Partial discharge testing under impulse voltage

– Optional extension –

Partial discharge testing is used to check the winding quality of wound components. Essentially, it aims to detect quality defects in windings that are not apparent with conventional high-voltage testing or impulse voltage testing alone. 

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

The test is performed either manually or fully automatically. In manual mode, the user increases the voltage while observing the partial discharge signal. 

The automated operation enables the fully automated analysis of all three phases via a test sequence. The following values ​​are determined for each phase: 

• PDIV (Inrush Voltage) 
• PDEV (Disable Voltage)
• RPDIV (repeating insertion voltage) 
• RPDEV (repeating intermittent voltage) 

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

Insulation Resistance Test

The insulation resistance test integrated into the basic unit is specifically designed for testing electric drives. The test voltage is automatically switched to the test lead, which is also used for impulse voltage and resistance testing. Reconnecting the device under test during individual measurements is not required. The switching process is fully automatic up to a test voltage of 50 kV within the test instrument.

The software offers pre-configured test sequences for PI, DAR, high voltage DC, megaohms, and step voltage. Combined with the new fully automatic ramp time determination, operation has been significantly simplified. To optimally configure the test instrument for specific applications, all parameters can also be set individually. These include, among others, the following functions:

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

Insulation resistance test with ramp

The ramp time is usually defined and set manually for each test object individually. However, it is important to ensure that maximum charging currents are not exceeded. 

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

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

• Automatic charging current detection for minimal ramp time
• Ramp and test time adjustable
• Graphical representation of current, voltage and insulation resistance in one diagram
• The discharge after the test is displayed and logged.

Resistance test

The MTC2 R7 comes equipped with resistance testing even in its basic version. This allows for the testing of phase resistances, temperature sensors (NTCs, PTCs, and KTYs), and individual coils without having to reconnect the test leads. Thanks to the integrated test method switching, the test is performed 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 V  mA
• Measuring 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 testing

– Optional extension for resistance testing –

The use of a capacitance measuring bridge is a thing of the past. Utilize the optionally integrated measuring bridge in the MTC2 R7 for highly accurate measurement of inductances, impedances, and capacitances.

The following evaluation options are available:

• Comparison of the actual value to a specified target value
• Determination of the symmetry (spread width) of all three phases

AC High-Voltage Test

– Optional extension –

The AC high-voltage test can be integrated into the MTC2 R7 and is immediately and automatically connected to the test terminals. No rewiring is necessary. The test is performed fully automatically via the test leads already connected to the device under test.

Due to the integration of high-voltage testing, this expansion is only available in the 19" rack-mount or desktop version. This increases the device's height to 10U.

Rotation field test

– Optional extension –

The rotation direction test allows the rotating magnetic field of a stator to be measured and evaluated. The test is performed non-contact using a rotating field probe that is either placed inside the stator or mounted on a test object holder.

The rotating magnetic field is generated by an electronic source that simulates the three-phase field of the electric motor. This test allows wiring errors in manufacturing to be detected even before the electric motor is assembled.

All test results can be printed on the modern standard report either immediately after the test or at a later time. The language of the report can be selected individually before it is generated. Reporting is performed in accordance with IEC 61934. The standard languages available are German, English, Chinese, Danish, French, Italian, Dutch, Polish, Portuguese, Swedish, Slovenian, Spanish, Czech, and Hungarian.

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

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

All test object data, test plans, test results, and user information can be efficiently synchronized across multiple test devices. This ensures that every test device is... Each desktop workstation is always up to date without the need to exchange data via an additional storage medium.

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

Use the extensive configuration options to specify which data, user access, and results are intended for which testing system and which are not.

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

The Voltage Analyzer

The VoltageAnalyzer is used to measure surge voltage signals directly at the electric motor winding. Its frequency response covers the range from DC to very high pulse frequencies in the MHz range. This makes the VoltageAnalyzer ideal for highly accurate surge voltage and partial discharge measurements. The VoltageAnalyzer measures voltages and voltage spikes directly where they occur. This could be, for example, at the motor terminal block or directly at the winding connections.

Voltage Measurement for Surge Voltage and Partial Discharge

It can happen that the voltage measured internally in the impulse voltage tester does not exactly match the voltage at the device under test. This is because the unavoidable inductances and capacitances in the measuring leads can alter the voltage waveform of the impulse signal on its way to the device under test. This effect is more pronounced the steeper the impulse rise.

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

The anchor booster

An additional armature booster is available for the MTC2 R7 test instrument for testing armatures. 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 laminations.

The armature booster is connected to the test leads of the MTC2 R7 . Two solid test probes are available at the booster's output. An integrated warning light indicates whether the terminals are de-energized. An audible signal indicates whether the test is OK or not OK.

All the facts at a glance

Test equipment with 6, 12, 15, 30, 40 and 50 kV impulse voltage