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Product features [t-head1-first]
- DM4 is a three-phase controlled soft starter
- 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 preprogrammed 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. In addition to phase failure and motor current monitoring, the motor winding temperature is signalled through the built-in thermistor input, so that the soft starters do not require additional, external components, such as motor protective relays. DM4 complies with 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.
The application selector switch enables direct assignment without parameter entry.
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