Motor protection The Triol AS25 stops the motor under the following conditions:

• Supply network disturbances;
• Current overload;
• Low motor insulation resistance; and
• Short circuiting.

Soft start When operating, the Triol AS25 supplies the motor a gradually increasing voltage so that the starting current is naturally limited. The rotor starts gearing gradually, and mechanical and electrical stress is thereby minimized.

Lower Energy losses The thyristor starter Triol AS25 runs a quasi-frequency start mode. This mode smoothly raises the frequency and the voltage at the start. When operating the soft starter in the quasi-frequency mode, the loss of energy in the motor is 2-4 times lower than a direct start, and 4-7 times lower than a soft start.
A quasi-frequency start is required when the motor is repeatedly re-activated: if the motor’s temperature does not have enough time to cool down to an ambient temperature, then you can use the quasi-frequency start algorithm.

Bypass At the end of the starting procedure, the thyristors are shunted by a special contactor, directly connecting the motor to the grid. By using a bypass contactor, this leads to an improvement in the system’s efficiency, the extension of the thyristors’ service life, and cancelling out the effect of semi-conducting components on the grid.

Smooth motor breaking The starter can stop the motor using these different means:

• Free run by removing the thyristor’s control pulse from the thyristor’s switchboard;
• Slowdown by lowering the tension in the stator’s windings; and
• Dynamic braking by injecting DC to the stator’s winding, opposing the motion’s direction.

Technological process simplification The Triol AS25 has an external front-end interface, which is adaptable to existing automation systems and generates automated control systems for different mechanisms. The core of the starter’s control system is a microprocessor-based controller, which performs motor control algorithms of any complexity.
For the transmission/reception of external commands, settings and data signals, the soft starter Triol Triol AS25 includes the following:

• 6 galvanically-isolated programmable digital inputs;
• 1 analog input; and
• 4 programmable digital (relay) outputs.

In addition, the Triol AS25 archives the motor and starter event logs (or accidents). This data, along with other statistical information under the MODBUS RTU protocol (channel RS-485), can be read by a top-level ACS. Similarly, all parameters from the Triol AS25 are read and recorded by the same protocol. It is remote control supported.

Solves any problem The solutions adopted in the development of the Triol AS25 starter cover virtually all possible applications involving the soft starting of synchronous or asynchronous motors.

• Using an ad-hoc algorithm for breaking the motor driving the pump, installation eliminates the hydrodynamic kickback in valves.
• With the Triol AS25 soft starter, it is possible to connect several motors (series and parallel circuit), relevant for pumping stations.
• For friction-type mechanisms, a soft starter can be used with one or more initial pulses of current (quick start), thereby eliminating slippage and clutch pulley.
• In the lumber industry, the Triol AS25 starter is used in belt conveyors to avoid dynamic shocks in conveyor equipment, and also in press, where pumps need to be turned on frequently.

Starting two or more motors The Triol AS25 high-voltage soft starter can handle starting several motors (up to three motors). The motor is switched on with the assistance of the High-Voltage Switching Cabinet (HVSC-1-1). After having started a motor, the starter pauses for minimum of 10 minutes, during which time the power-operated equipment cools down.
The HVSC-1-1 with high-voltage contactor is designed for use as part of the soft starter system for two or more motors. It is possible to order the number of cabinets corresponding to the number of motors to be started. If there is only one motor, then a switching cabinet is not necessary. The cabinet can be used to switch load and connect different input high-voltage compartments during operation.