Product Overview

The Schneider Electric LTMR08CBD TeSys T Motor Controller is an intelligent motor management controller designed for monitoring, controlling, and protecting industrial AC motors. It belongs to Schneider Electric’s TeSys T motor management system and combines current measurement, motor protection functions, control I/O, and CANopen communication in a compact industrial device.

Motor management is essential in industrial facilities where pumps, fans, conveyors, compressors, and other motor-driven machines operate continuously or under changing loads. Electrical faults, overload conditions, phase loss, and excessive starting loads can interrupt production and damage equipment. A motor management controller helps detect abnormal conditions, provides operating information, and supports coordinated control strategies.

The LTMR08CBD supports a motor current measurement range of 0.4–8 A and uses a 24 V DC control supply. Its CANopen communication interface allows it to exchange status information, alarms, and control data with compatible automation equipment. This makes it suitable for integration into PLC-based industrial control systems that require centralized motor monitoring and management.

The controller provides six discrete logic inputs, three normally open relay logic outputs, and a separate relay output for fault signaling. It also supports connections for motor temperature sensing and external ground-current sensing. These functions help maintenance personnel monitor motor conditions and respond to abnormal operating events.

The LTMR08CBD is not a standalone power contactor or variable frequency drive. It is a motor management controller intended to work with suitable switching and short-circuit protection equipment. Correct selection of the contactor, protective devices, wiring, and controller settings is necessary to build a complete motor control and protection arrangement.

Technical Specifications

Note: The current measurement range is a selection parameter, not the control supply rating. Verify motor nameplate current and the required protection settings before installation.

Function and Working Principle

The LTMR08CBD monitors electrical and operating information associated with a motor and uses configured parameters to support motor control and protection. It can communicate with a PLC or another compatible controller through CANopen, allowing motor status and fault information to become part of the wider automation system.

1. Motor Current Measurement

The controller measures motor current within its specified 0.4–8 A range. Current information helps the control system assess motor loading and identify abnormal operating conditions.

For example, a pump motor drawing more current than expected may indicate increased mechanical resistance, a process change, or another developing problem. Current measurements can help operators investigate the cause before it leads to an unplanned shutdown.

The controller’s current range must be appropriate for the connected motor. Where the motor’s current falls outside the supported measurement range, an appropriate alternative controller or manufacturer-approved current-transformer arrangement may be necessary.

2. Motor Overload Protection

An overloaded motor may draw excessive current and experience elevated winding temperatures. If this condition persists, insulation deterioration and motor failure can occur.

The LTMR08CBD supports configurable overload protection. Correct configuration requires the motor’s rated current and the application’s starting and operating characteristics to be taken into account.

The controller’s protection settings should be selected according to the motor manufacturer’s specifications and the applicable electrical protection design. It should not be assumed that the same settings are suitable for every motor.

3. Phase Failure and Phase Imbalance Detection

Three-phase motors depend on suitable electrical supply conditions. Phase loss and phase imbalance can result in abnormal current, reduced torque, overheating, or unreliable operation.

The LTMR08CBD includes phase-failure and phase-imbalance protection functions. When a monitored condition meets the configured trip criteria, the controller can initiate the relevant protection response and communicate the fault state to the automation system.

These functions are particularly useful in industrial installations where motors operate pumps, conveyors, and other equipment that may be damaged by prolonged abnormal operation.

4. Motor Temperature Monitoring

The controller supports connection to a compatible motor temperature sensor, such as a suitable PTC thermistor arrangement.

Temperature monitoring provides additional information about motor thermal conditions. When correctly configured with a compatible sensor, it can help identify overheating before it develops into a more serious failure.

Sensor type, wiring, and configuration must follow the manufacturer’s instructions.

5. Ground-Current Monitoring

The LTMR08CBD supports connection to an external ground-current sensor. This arrangement can provide additional protection information where ground-fault monitoring is required.

The sensor must be compatible with the TeSys T system and installed according to the manufacturer’s wiring instructions. Ground-current monitoring should be coordinated with the overall grounding and electrical protection design.

6. CANopen Communication

The controller uses CANopen to exchange information with compatible automation devices. This allows a PLC or supervisory system to receive operating status and fault information and, where configured, issue control commands.

CANopen communication requires correct network addressing, baud-rate configuration, cable selection, termination, and integration with the PLC program.

Role in Industrial Control Systems

The LTMR08CBD can serve as a motor management component within a distributed industrial control architecture. Rather than relying only on local electrical protection, the system can collect motor-related information and make it available to a PLC, HMI, or supervisory application.

PLC Integration

A programmable logic controller can communicate with the LTMR08CBD over a compatible CANopen network. Depending on the system configuration, the PLC can monitor motor status, identify alarms, coordinate start and stop sequences, and manage interlocks.

This arrangement is useful when a production line contains several motors and the control system needs a consistent way to monitor operating conditions.

The exact data available to the PLC depends on the controller configuration, communication mapping, and application program.

HMI Monitoring

A human-machine interface can display motor operating states, alarms, and fault conditions when integrated through a compatible control system.

Operators may use this information to identify a motor that has tripped, investigate an overload, or determine whether a machine is ready to restart. Clear alarm messages and appropriate operating procedures can reduce troubleshooting time.

Motor Starter Coordination

The LTMR08CBD is designed to work as part of a complete motor control arrangement. A contactor or other suitable switching device handles the motor’s power circuit, while appropriate short-circuit protection provides the required electrical protection.

The controller’s outputs and control logic can be integrated with the switching arrangement to support the intended motor operating mode. The precise circuit must follow the manufacturer’s instructions and applicable safety requirements.

Fault Reporting and Maintenance

The controller supports diagnostic information and fault-related reporting. Depending on the configuration, information may include overload trip context, starting current and time, operating time, and recorded events.

This information can help maintenance personnel distinguish between electrical problems, mechanical loading issues, and process-related disturbances.

Industrial Applications

The LTMR08CBD is intended for motor management applications where the connected motor’s current falls within the controller’s 0.4–8 A measurement range and CANopen communication is suitable for the control system.

1. Pumping Systems

Industrial pumps are used in water treatment, cooling circuits, process plants, and fluid transfer systems. A motor management controller can monitor current and provide protection against selected abnormal conditions.

If a pump experiences an overload or phase-related fault, the controller can support the appropriate protection response and communicate the condition to the PLC.

2. Industrial Fans and Ventilation

Fans and ventilation equipment frequently operate for extended periods. Monitoring motor current and thermal conditions can help identify abnormal operation before it causes equipment downtime.

The controller can be incorporated into a motor starter arrangement to provide monitoring and protection for appropriately rated fan motors.

3. Conveyor Systems

Conveyors rely on motors to move products and materials between production stages. An overload may result from excessive material accumulation, mechanical resistance, or a problem in the transmission system.

The LTMR08CBD can provide current monitoring and fault information to the control system, helping operators identify abnormal motor conditions and coordinate safe machine responses.

4. Packaging and Assembly Machinery

Packaging and assembly systems often contain several small motors operating in sequence. Motor management can help the PLC identify abnormal conditions and prevent a local motor fault from creating a wider production interruption.

The controller’s discrete inputs and relay outputs can be incorporated into suitable machine-control logic, subject to the requirements of the application.

5. Auxiliary Industrial Motors

The controller may also be used with compatible auxiliary motors in manufacturing facilities, material-handling equipment, and process systems.

Before selecting the LTMR08CBD, verify the motor’s rated current, starting behavior, required protection functions, and the communication protocol supported by the installed automation system.

Installation and System Integration

Correct installation is essential for reliable motor monitoring, effective protection, and stable communication.

1. Verify the Motor Current Range

Confirm that the motor’s rated current is compatible with the LTMR08CBD’s 0.4–8 A measurement range. The selected protection settings should match the motor’s nameplate data and the application requirements.

If the motor’s current is outside the supported range, select a suitable controller or use only a manufacturer-approved measurement arrangement.

2. Provide the Correct Control Supply

The LTMR08CBD uses a nominal 24 V DC control supply, with a documented supply range of 20.4–26.24 V DC.

Check the power supply’s voltage, current capacity, polarity, and wiring before energizing the controller. The control supply must be distinguished from the motor’s main power supply.

3. Mount and Wire the Controller

The supplied product dimensions are 91 × 61 × 122.5 mm, and the listed weight is 0.53 kg. Allow sufficient space for mounting, terminal access, communication cables, and maintenance.

Install the controller according to the manufacturer’s mounting and environmental requirements. Keep control and communication wiring properly organized and separated from power wiring where required.

4. Configure CANopen Communication

Set the CANopen node address and communication speed according to the network design. Verify the correct cable type, connector pinout, shielding, grounding, and bus termination.

The PLC’s CANopen configuration must match the controller’s settings. Incorrect addressing or termination may cause intermittent communication or prevent the controller from joining the network.

5. Configure Protection Parameters

Enter the motor-related settings and configure the required overload, phase-failure, phase-imbalance, and other supported protection functions.

Review the trip behavior and alarm handling before commissioning. Settings should reflect the motor’s characteristics and the machine’s operational requirements rather than being copied indiscriminately from another installation.

6. Test the Motor Starter Arrangement

Before putting the system into service, verify the contactor wiring, short-circuit protection, control logic, and controller outputs.

Test the intended start and stop sequence, fault reporting, overload response, communication status, and restart procedure. Confirm that any fault requires the appropriate investigation before the motor is returned to service.

Compatible System Components

The LTMR08CBD is designed to function as part of a TeSys T motor management arrangement. Component compatibility depends on the selected control architecture and the required motor protection functions.

The components listed above are examples of a complete motor management installation. They are not necessarily included with the LTMR08CBD controller.

Alternative Models and Replacement Considerations

When replacing the LTMR08CBD, select a controller that matches the motor current range, control supply, communication protocol, and required protection functions.

These models are related products, not automatic drop-in replacements. Before substitution, verify the complete catalog number, motor current range, communication protocol, I/O mapping, mounting, wiring, and configuration requirements.

A change from CANopen to Ethernet, Modbus, PROFIBUS, or DeviceNet may require PLC program changes and network redesign. A controller with a different current range may also require changes to protection settings and motor circuit engineering.

Key Advantages

Integrated Motor Monitoring

The controller combines current measurement, protection functions, and diagnostic information to help maintenance teams understand motor operating conditions.

Configurable Protection

Supported overload, phase-failure, and phase-imbalance functions help detect conditions that may damage motors or interrupt production.

CANopen Connectivity

The communication interface supports integration with compatible PLCs and automation systems, enabling centralized monitoring and control.

Multiple I/O Functions

Six discrete inputs and three relay logic outputs provide interfaces for suitable control and monitoring arrangements. A separate fault relay output supports fault signaling.

Temperature and Ground-Current Sensor Support

Compatible external sensors can provide additional information for motor protection and fault detection.

Compact Industrial Design

With dimensions of 91 × 61 × 122.5 mm and a listed weight of 0.53 kg, the controller can be incorporated into appropriately designed motor control panels.

Support for Maintenance Diagnostics

Operating information and fault records can help technicians investigate recurring trips, abnormal loading, and other motor-related problems.

Technical FAQs

1. What is the Schneider Electric LTMR08CBD?

It is a TeSys T motor management controller used for motor monitoring, control, and protection. It supports CANopen communication and has a 0.4–8 A current measurement range.

2. What control voltage does the LTMR08CBD require?

It uses a nominal 24 V DC control supply. The documented supply limits are 20.4–26.24 V DC.

3. What communication protocol does it support?

The LTMR08CBD supports CANopen. It is not interchangeable with a Modbus, PROFIBUS, DeviceNet, or Ethernet model without considering network and control-system changes.

4. How many inputs and outputs are available?

The controller has six discrete logic inputs, three normally open relay logic outputs, and a separate changeover relay output for fault signaling.

5. Can the LTMR08CBD directly switch a motor’s main power?

It should not be treated as a standalone motor power contactor. A complete motor starter arrangement requires appropriate switching equipment and short-circuit protection, coordinated with the controller.

6. Does it support motor temperature monitoring?

Yes. The controller supports a compatible motor temperature sensor connection. Verify the sensor type and setup requirements before installation.

7. What is the current measurement range?

The specified range is 0.4–8 A. Confirm that the connected motor’s current and protection requirements fall within the controller’s supported range.

8. Can it be integrated with a PLC?

Yes. A PLC with compatible CANopen support can communicate with the controller. Network configuration and PLC data mapping must be completed correctly.

9. What are the dimensions and weight?

The product dimensions are 91 × 61 × 122.5 mm, and the listed product weight is 0.53 kg.

10. What should be checked before purchasing a replacement?

Verify the full model number, current range, control voltage, communication protocol, terminal condition, product condition, and any required accessories. For an operating installation, confirm that the replacement supports the same control and protection requirements.

Procurement and Maintenance Recommendations

When purchasing the Schneider Electric LTMR08CBD, confirm that the catalog number matches the required CANopen, 24 V DC, 0.4–8 A configuration. Related TeSys T controllers may look similar but can use different communication protocols or current ranges.

For new, surplus, or refurbished equipment, request clear photographs of the label and terminals. Confirm the unit’s condition, included accessories, and available test information. If the controller is intended for a critical production line, verify its compatibility with the existing PLC program and motor starter arrangement before installation.

During routine maintenance, inspect terminal connections, control wiring, CANopen network connections, and the condition of associated contactors and protective devices. Review recurring alarms and trips instead of repeatedly resetting the controller without investigating the cause.

Maintain records of motor parameters, protection settings, network addresses, and PLC configuration. These records can simplify troubleshooting and reduce commissioning time if the controller must be replaced.

Conclusion

The Schneider Electric LTMR08CBD TeSys T Motor Controller is an intelligent motor management device designed for monitoring, control, and protection of compatible industrial AC motors. Its 0.4–8 A current measurement range, 24 V DC control supply, CANopen communication, six logic inputs, and relay outputs make it suitable for integration into PLC-based motor management systems.

The controller supports functions such as overload protection, phase-failure monitoring, temperature-sensor integration, and fault reporting. For reliable operation, engineers should verify motor compatibility, configure protection parameters correctly, and integrate the controller with suitable switching and short-circuit protection equipment.