Moeller - DM soft starters - Standard applications (selector switch)

Standard applications (selector switch) [t-head3-np]


Labelling on device	Indication on keypad	Meaning	Notes
Standard	Standard	Standard	Default settings, suitable without adaptation for most applications
High torque¹⁾	High Torque	High breakaway torque	Drives with higher friction torque at standstill
Pump	Small pump	Small pump	Pump drives up to 15 kW
Pump Kickstart	Large pump	Large pump	Pump drives over 15 kW longer startup times
Light conveyor	LightConvey	Light conveyor
Heavy conveyor	HeavyConvey	Heavy-duty conveyor
Low inertia fan	LowInert.fan	Low-inertia fan	Fan drive with relatively small mass inertia moment of up to 15 times the motor’s inertia moment
High inertia fan	HighInertfan	High-inertia fan	Fan drive with relatively large mass inertia moment of over 15 times the motor’s inertia moment. Longer ramp-up times.
Recip compressor	RecipCompres	Reciprocal compressor	Higher start pedestal, p.f. optimization matched
Screw compressor	ScrewCompres	Screw compressor	Increased current consumption, no current limitation
1) For the “High Torque” setting, the soft starter must be able to supply 1.5 times the motor’s rated current.

In-delta circuit [t-head3]

As a rule, soft starters are connected directly in series with the motor (in line). The DM4 soft starters also allow a delta connection.

Advantage:

This circuit is cheaper because the soft starter has to be laid out for only 58 % of the motor full load current.

Disadvantages over in-line connection:

As in a star-delta circuit, the motor must be connected with six conductors.

The DM4’s overload protection is active only in one line. so that additional motor protection must be fitted in the parallel phase or in the supply cable.

Note

The delta connection is more cost-effective at motor ratings over 30 kW and when replacing star-delta switches.