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Product attributes [t-head1-first]
- Configurable, communications-capable soft starter with plug-in control signal terminals and interface for optional units:
- Application selector switch with user-programmable parameter sets for 10 standard applications
- I2t controller
- Kickstarting and heavy starting
- Automatic control voltage detection
- 3 relays, e.g. fault signal, TOR (top of ramp)
Ten default parameter sets for typical applications can be simply called up with a selector switch.
Additional plant-specific settings can be defined with an optional keypad.
In three-phase regulator control mode, for example, three-phase resistive and inductive loads – heaters, lighting systems, transformers – can be controlled with the DM4. Both open-loop and – with measured value feedback – closed-loop control are possible.
Instead of the keypad, intelligent interfaces can also be used:
The DM4 soft starters provide the most convenient method of implementing soft starting. Because – in addition to phase failure and motor current monitoring – the motor winding temperature is signalled through the built-in thermistor input, the soft starters eliminate the need for additional, external components, such as motor protective relays. DM4 conforms to the IEC/EN 60947-4-2 standard.
With the soft starter, reducing the voltage results in a reduction of the high starting currents of the three-phase motor, although the torque is also reduced [Istartup ~ U] and [M ~ U2]. After starting, the motor reaches its rated speed with all of the solutions described above. For starting motors at rated-load torque and/or for motor operation at a motor speed that is independent of the supply frequency, a frequency inverter is required.
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