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The soft starters of the SAG series are matched to the respective motor and mains data and are universally preset. This presetting means that the devices can be used immediately in the majority of applications without additional adjustment. For heavy starting applications, the SAG can be adapted to the changed motor characteristics via a changeover switch.
The 21 device types from 17 A to 1200 A are designed for a particularly wide voltage range from 208 to 500 V and can therefore be used universally.
Torque control in the transition phases optimizes smooth start-up and deceleration and enables linear and constant run-up and deceleration independent of the load and without tachometer feedback. Compared to conventional starters, this results in a reduction of engine losses in the transition phases by at least 10 to 15% and the associated energy savings.
A microprocessor-controlled monitoring system continuously calculates the motor heating. In the case of devices from 22 kW, this monitoring takes place during operation even when a bypass contactor is used, since the motor current is always conducted via the internal current transformers. If the monitoring limit is reached, an overload alarm is triggered which remains stored even if the control voltage fails. After an overtemperature shutdown, the thermal protection prevents the restart in case of a still existing overtemperature.
The SAG is preset for protection of tripping class 10 in standard operation or class 20 in heavy starting operation and can be adapted to other tripping classes by means of an optional operating module.
With the optional operating module, it is not only possible to display operating data (current, torque, therm. motor load, Cos Phi) or the parameters. Rather, it is used to adapt the softstarter to special conditions and to activate additional functions such as
After parameterization, the set values remain stored in a power-failure-proof manner and the operating module can be removed again if required.
A PC module is available as a further option, which also enables data backup and remote loading of parameter sets.