S811+ PREMIUM SOFTSTARTER
Soft Starter S801+/S811+
The three-phase motor is currently the optimum drive for simple and economic implementation of machine and system concepts. Nevertheless, a direct-on-line start or a star-delta start is not always the best solution. Soft starters offer the gentle alternative for almost every application for judder free and power network protected motor starts.
S801+/S811+ – Soft Start up to 850 A (1472 A “In-Delta)” Eaton S801+ / S811+
The Soft Starter Family is ideal for applications like pumps, fans and conveyors. Prolonged service intervals and reduced cost of ownership are additional advantages.
S801+ / S811+
Motor voltage – soft start :
With the soft starter, gating control is used to reduce the motor voltage, then within a predetermined ramp-up time (tSTART), is raised to the mains voltage from an easily-set starting voltage (USTART). In this way, the smooth starting and stopping of the motor protects the mechanical devices connected to it from being subjected to the load with a jolt, and it prevents current peaks and therefore voltage dips in the electrical supply network.
Motor torque – reduced load :
Current and voltage fluctuations during start-up can lead to problems in the network. The resulting abrupt torque fluctuations place stress on machines, necessitating service work and influences on production quality. A soft starter allows you to minimise these disadvantages. It ensures a smoother torque characteristic and reduces your operating costs.
Motor current – damping current peaks:
Power supply companies are demanding increading adherence to certain current limits. The aim is to avoid overloading the network due to high inrush currents during direct-on-line starting or current peaks during star-delta starting, in order to prevent unpleasant side effects such as voltage dips. The reduced voltage start of soft starters eventuates a reduction of peak-currents.
In-line configuration/In-delta configuration (S811+ only)
In-delta configuration :
Advantages of the „In-delta configuration"
In this circuit configuration, the individual phases of the S811+ are connected in series with the individual motor windings (six conductor connections as with the star-delta starter). The soft starter must only conduct about 58 % of the rated motor current. This facilitates the use of a significantly smaller device.