These devices are designed for switching on/off 3-phase induction motors in LV electric installations. They provide the protection of motors against overcurrent, overload, as well as short-circuits. They contain a thermal trip for the protection against overcurrents and overloads, and an electro-magnetic trip for the protection against short-circuit currents. The switching mechanism is a mechanical 3-pole switching system with manual control for switching on (START) and off (STOP). They can be mounted on DIN rails, into enclosures and cubicles.

motor starters 

TeSys U starter controller (Tesys Ultima)

    Tesys U is a modular starter controller with total coordination. The total coordination means that the motor starter can switch and protect electric equipment with its immediate returning to service after the cause of failure is removed.
    Tesys U protects equipment (through breaking) against short-circuit currents 50 to 130 kA which can flow in circuits in case of failures. It also provides thermal protection, overcurrent protection, protection against phase failure and phase imbalance, and other types of protection.

    Protections are divided into three control modules:

  1. standard LUCA
  2. advanced LUCB, LUCC, LUCD
  3. multifunction LUCM

    The standard module provides the standard protection for 3-phase motors: Class 10 thermal protection, short-circuit protection up to 50 kA, protection against phase failure and phase imbalance.

    The advanced control modules let the user select between several trip classes: class 10 (LUCC) and 20 (LUCD) for 3-phase motors, and class 10 for 1-phase motors and electric equipment (LUCC). Via auxiliary modules it is possible to detect the type of failures as well as to evaluate current overloads as alarms for preliminary notification of inadequate or problematic operation prior to switching off the equipment. In many cases it is possible to remove the problem even during the machine operation so that it is not necessary to switch off the equipment as a result of failure, whereby the number of shut-downs is reduced.

    The multifunction control module allows to set the class from 5 to 30, and it is also possible to view, on the display, some circuit parameters (phase currents, error log, ...). By current monitoring the module can inform and protect equipment against no-load running (important in applications with immersion pumps, ...), as well as in case of currents below a limit value.

    While selecting the control module, apart from the type of protection, it is important to consider options for connecting other components such as communication modules, function modules, as well as auxiliary contacts. It is also important to select the module according to the current load: there are only 6 ranges from 0,15 to 0,6A; from 0,35 to 1,4A; from 1,25 to 5A; from 3 to 12A; from 4,5 to 18A, and from 8 to 32A, not to forget the control voltage of starter. There are 4 types of coils 24VAC, 24VDC, 48-72VAC/DC, and 110-240VAC/DC (the multifunctional module can be controlled and supplied with 24 V DC only). These control modules are plugged into the LUB power base.
    The power base can be directly connected into the circuit of a motor (say the internal motor starting), thereby switching and protecting it up to 16,5 kW (up to 32 A), or it can be connected with the monitored circuit via a transformer and indirectly protect the motor or equipment by controlling a contactor in type 2 coordination up to 800 A (say the external motor control and protection). The power base for the internal motor starter also contains, apart from a 3-pole contactor with one auxiliary NO and one NC contact, a disconnector. This type of module is sold in two current versions up to 12A and up to 32A. The module for external control also contains, apart from a contact for contactor control, a reset button. The dimensions of all modules are the same, the width being 45mm, height in case of direct starting 154mm, and depth 135mm.

    Tesys U can be expanded with a reverser block. It is mounted next to the power base or directly beneath the power base, and the connection is solved similarly to how the thermal relay is connected in case of conventional circuits, so the width of motor starter is not modified. It is an innovation which significantly reduces the size of switch-boards, eliminates errors of incorrect wire connection, and also solves the issue of mechanical interlocking of contactors.

    It can also be expanded with a limiter-disconnector module which is able to limit high short-circuit currents. It is mounted directly on the power base. For example, one of them is LUALB1 allowing the breaking capacity to be increased up to 130 kA at 400 V. This module also serves as a disconnector with visible disconnection since the limiter module can be easily removed from the adaptor and thus the visibility of disconnection of poles is ensured.

    With regard to communication it is possible to use a module for parallel bus, or AS-i communication module, Modbus module. Using the Modbus protocol we can get information about the starter status, alarms, load status, failure type, logic functions, it is also possible to set up, monitor, and reset the starter remotely, as well as to control the starting itself. Using LUFP gateways it is possible to communicate through FIPIO, Profibus DP, or DeviceNet protocols..

    The setting of motor starter parameters is possible via the Power Suite software (minimum version 1.4) and a PC or notebook.

TeSys Ultima starter controller