Soft Starter DM4

Communication-capable motor starter with internal motor protection function

Features

Application selector switch with 10 standard applications.
Programmable relays and analogue outputs.
Internal motor protection function (I2t monitoring).
Motor protection (Thermistor input).
Function expansion with communication cards.
Analog setpoint setting.

Application Examples

Internal current limitation limits the current peaks with circular saws, ribbon saws, agitators, mills and crushers at motor start.
High lifespan and low wear with fans and pump drives.
Controlled start and stop with conveyor drives prevents damage to the transported goods and premature wear in frequently spacious and extensive systems.
As a three-phase regulator for control of heating and lighting systems as well as for inrush current limitation with transformers.
With remote diagnostics and fieldbus interfacing in chemical plants.

In-line configuration

Rated current I_e of the DM4 corresponds to the motor current I_N.
3 cables to the motor.

In-delta configuration

Rated current I_e of the DM4 corresponds to 58% of the motor current I_N.
6 cables to the motor (as with a star-delta starter).

Advantages of the "in-delta configuration"

In this circuit configuration the individual phases of the DM4 are connected in series with the individual motor windings (6 conductor connections, as with the star-delta starter). The soft starter must only conduct about 58% of the rated motor current. This ensures the use of a significantly smaller device.

Power supply
230–460 V ±10 %, 50/60 Hz

Control voltage
14–230 VAC / DC

Performance range
16–900 A
7.5–500 kW (in-line configuration)
11–900 kW (in-delta configuration)

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This page last updated: 7 September 2007