Softstarters, DoldPCB,Safety,Relays,DoldPCB,Safety,Relays,DoldPCB,Safety,Relays,DoldPCB,Safety,Relays,Dold

Softstarters From DOLD

DOLD softstarters ensure a soft and jerkless starting of your asynchronous motors. This reduces wearing and improves the service life of your motors and mechanical drive components. Application areas include:

  • Machines with geared, belt and chain drives
  • Conveyors, fans, pumps, compressors
  • Wood working machines, centrifuges
  • Cranes, travelling and slewing gear, elevators

Advantages

... at a glance

  • Easy installation by snapping on a top hat rail
  • Space-saving by compact design with integrated bypass relay
  • Improve safety by integrated temperature monitoring
  • Improve setting flexibility by separate setting of starting time, locked-rotor torque and deceleration time
  • More application flexibility, suited for a wide motor voltage range
  • Take off load from the supply system by reduction of starting currents

Technology

Starting methods for motors are the starting current as well as the starting torque

To get this under control it is the best to reduce the clamp voltage of the motor.

The following procedures have been developed until now:

  • starting transformer
  • starting resistor 3-pole
  • starting resistor 1-pole (KUSA- circuit)
  • star- delta switch
  • softstarter

Currents and torques during the start of motors

Direct Start

most simple method
IA  = 6 ... 8 x IN
MA = 2 ... 3 x MN

Star / Delta

most usefull method
IA  = 2 ... 3 x IN
MA = 0,7 ... 1 x MN

 

Transformator

no more importance

KUSA-Switching

rare, old
IA  = 6 ... 8 x IN
MA = 0 ... 3 x MN

 

 

Softstarter 

IA  = 2 ... 5 x IN (adjustable)
MA = 0,15 ... 1 x MN (adjustable)

 
 

IA  = initial current
MA = initial torque
MN = nominal moment
IN  = nominal current

What is a softstarter ?

  • electronic softstarter= electronic controlled dimmer
  • it works wear- free
  • it is maintenance- free
  • it is very easy to retrofit in already existing systems
  • EMC standard conformity according to DIN EN 60947-4-2

 Power semiconductors (thistore, triacs) adjust continuously the supply voltage via phase- angle.

 → current and torque increase steadily.

Softstarters: Why are they used?

  • Problems with direct start of a drive with three-phase current motor

    - Gears, belts, chains, couplings Mechanical wear
    - Transport
      Tapes/Bands upsetting or shifting of goods
    - Pump
      Plants Pressure shock in the line
    - Electrical net
      High initial current (6-8 times nominal current)
      Exceeding of tariff limits
      Overload of electrical installations
      Voltage variations
    - Environment
      Loud startin noise
  • Softstarters remove and minimise the above- mentioned problems

Applications

Application areas of DOLD softstarters include:

  • Centrifuges
  • Wood working machines
  • Cranes, travelling and slewing gear, elevators
  • Machines with geared, belt and chain drives
  • Conveyors
  • Fans, pumps, compressors
Softstarters MINISTART, 1-phase controlled
Function
f. three-phase
motors, 400 V
up to [kW]
f. single-phase
motors, 230 V
up to [kW]
Diverse
signalling
outputs
Load
voltage [V]
Auxiliary
voltage
required
Extra functions:
Temperature /
system monitoring
Width
[mm]
Type
Standard
1.5
to 230
35
with softstart function
1.5
to 230
35
Standard
5.5
1.5
to 480
45
Standard
11
3
to 480
100
with softstart function
7.5
+
100 to 480
+
T, N
90
Softstarters MINISTART, 2-phase controlled
Function
f. three-phase
motors , 400 V
up to [kW]
Diverse
signalling
outputs
Load
voltage [V]
Auxiliary
voltage
required
Extra functions:
Temperature /
system monitoring
Width
[mm]
Type
with soft coasting and reverse function
0.75
+
200...400
+
T
72
with soft coasting
110
+
... 575
+
T,N
98; 145;
202
with soft coasting
22
+
... 480
T, N
45; 52.5
with soft coasting
5.5
200 ... 480
+
T
45
with soft coasting
11
200 ... 480
+
T
90
with soft coasting
15
200 ... 480
+
T
90
with soft coasting
7,5
+
... 400
T, N
45
with d.c. braking
15
+
200 ... 480
+
T, N
90
with d.c. braking and
standstill detection
15
+
200 ... 480
+
T, N
112.5
with d.c. braking and
standstill detection
15
+
200 ... 480
+
T, N
112.5
Softstarters MINISTART, 3-phase controlled
Function
f. three-phase
motors , 400 V
up to [kW]
Diverse
signalling outputs
Load
voltage [V]
Auxiliary
voltage
required
Extra functions:
Temperature /
system monitoring
Width
[mm]
Type
with softstart function
800
200...525
+
T, N
156...750
with softstart function
3
200...480
+
T
45
with softstart function
55
+
...690
T
235; 335
Smart Motorstarter
4
+
200...400
T
22.5
* Following product are also available:


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