ISA-DS

Soft Starter

8–1,100 A and 200–690 V


ISA-DS Digital Soft Starter with a built-in bypass

Advantages at a glace

  • Superior starting and stopping characteristics
  • Comprehensive motor protection package
  • Easy commissioning
  • Fully equiped starters
  • Small foot print
  • Third generation microprocessor based design
  • Built-in bypass
  • RS 485 Communication
  • Frequency autotracking: 45 – 65 Hz
  • Unique optional features including: Analogue output and additional enhancements

Details

For full view please move the table horizontally if necessary.
Starter Type kW at 400 V Width (mm) Height (mm) Depth (mm) Weight (kg)
ISA-DS 8 4 120 232 122 3.0
ISA-DS 17 7.5 120 232 122 3.0
ISA-DS 31 15 120 232 122 3.0
ISA-DS 44 22 120 232 122 3.0
ISA-DS 58 30 129 275 182 5.2
ISA-DS 72 37 129 275 182 5.2
ISA-DS 85 45 129 380 182 8.5
ISA-DS 105 55 129 380 182 8.5
ISA-DS 145 75 172 380 192 12.5
ISA-DS 170 90 172 380 192 12.5
ISA-DS 210** 110 365 643 277 37.0
ISA-DS 240** 132 365 643 277 37.0
ISA-DS 310** 160 365 643 277 37.0
ISA-DS 360** 200 510 631 298 41.5
ISA-DS 414** 225 510 631 298 41.5
ISA-DS 477** 250 510 631 298 41.5
ISA-DS 515** 315 480 691 302 46.7
ISA-DS 590** 355 480 791 302 55.5
ISA-DS 720** 400 510 791 305 60.0
ISA-DS 840** 450 510 791 305 60.0
ISA-DS 960** 560 558 815 316 85.0
ISA-DS 1100** 630 558 815 316 85.0
**Dimensions and weights for ISA-DS EX are different

Approvals

1) Only for ISA-DS EX. Test performed by TÜV Rheinland: 194/Ex449.01/07

Current limit

The voltage increases linearly from the “Initial Voltage“ pre selected point. If the adjusted “Current Limit” is reached, the voltage will stop ramping and remain at its level until the current is reduced below the adjusted “Current Limit“ level. In that case ramp up time is prolonged until the current has reduced below “Current Limit” level 

Soft starter output voltage

Although the current is limited the motor provides suitable torque to accelerate the driven load and reach “End of acceleration”. If the motor torque does not exceed the load torque the motor will not start. In the so rare cases severe damages might occur to the motor and starter.

Motor start measured with an oscilloscope
(Ch1, voltage; Ch2-4 current L1 – L3)

The oscillogram shows, the soft starter providing a smooth and stepless current and voltage ramp to the motor. The voltage ramps up until “Current Limit” is reached. After the motor is at nominal speed, the current will decrease, to the nominal motor current.

Pump control

Our digital Soft Starters line of products ISA-D, ISA-DS and ISA-HD provide an advanced microprocessor based control algorithm, enabling the sophisticated pump control feature. The motor torque is continuously monitored to eliminate peak
torque from stressing the motor, pump and pipe system. These soft starters provide 3 field selectable pump control algorithms.

Pump and special load control

Two major problems are associated with starting and stopping of pumps.

Over-pressure during starting

The sharp increase of torque towards the end of acceleration can cause high pressure and damage the pipe system. The pump control enables selection between three voltage ramp-up curves as well as torque curve to reduce peak torque. Current ramp is available for special loads.

Water hammer during stopping

During soft stop, when voltage is decreasing, motor torque may fall below load torque causing abrupt stalling instead of smoothly decreasing speed to zero. This creates the “water hammer” phenomenon (resulting in a loud noise and damage to the pipe system). The pump control algorithm enables selection between three voltage ramp-down curves or torque curve pre venting stall condition and eliminating water hammer.

Digital

  • Illuminated LCD with 2 lines of 16 characters each
  • Selectable languages: English, German, French or Spanish (aditional on request)
  • The LCD indicates the motor current, fault descriptions and statistical data.
  • The LEDs provide a quick status indication. (control voltage on, motor soft start, motor on, motor soft stop, motor stop, fault)
  • Easy settings by six clearly marked keys, user-friendly software with factory default parameters.

Communication RS 485

Modbus Profibus

RS 485 with MODBUS or PROFIBUS protocol enable:

  • Remote (start, stop, etc.)
  • Monitoring (motor current, faults, statistical data)
  • Remote parameter setting
  • Remote reset

ISA-D options

Analogue option card

  • Function 1: Thermistor-input, PTC or NTC
  • Function 2: Analogue-output, based on the motor current, programmable from 0 – 10 VDC, 4 – 20 mA, 0 – 20 mA or inverted

Motor insulation option card

This unique feature guarantees the availability of important plant components, such as fire-extinguishing systems, redundant systems as well as submersible pumps. The system measures the motor insulation level while the motor is not in operation. Two programmable steps are available:

  • Alarm-Level, adjustable 0,2 – 5 MOhm
  • Start inhibit, adjustable 0,2 – 5 MOhm, avoids motor starting if the insulation is below the critical level.

Bypass

Internal bypass

  • This reliable components bypass the power electronics after the motor is at speed.
  • In addition the starters provide an auxiliary contact, allowing signaling of a successful motor start.
    Attention! Many of our competitors call these auxiliary relays “a bypass contact”!
  • The bypass function reduces the heat dissipation and eliminates the EMC load of the system.