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Siemens Sirius Soft Starter 3RW44 failure
Siemens Sirius Soft Starter 3RW44 failure
We have a 750 KVA Doosen generator connected to a Marelli power unit as the power source. This is enough power to operate a 230 kva motor during soft start.
Commissioning of this 3RW44 has failed despite 3 visits from Siemens to calibrate the soft starter 3RW44 with the Siemens motor. We have had this unresolved problem going for 5 months now and the Siemens experts are unable to offer a solution to date. We are a new shrimp farm in Saudi Arabia and with no pump there is no farm.
On the final switch over to full motor (and therefore pump) operation the softstart 3RW44 shuts the whole thing down. We have two identical pumps, motors and soft starters and both shut down in this way. We have tried slow ramp up, fast ramp-up and always at the end of the soft starter cycle, the sofstarter shuts down and stops the motor. The soft start message says it registered high voltage to the soft starter unit. The software settings of the 3RW44 do not include a way to alter or override this message.
On a slow ramp up, you can hear the generator slowly picking up load, but at no time does the generator sound overloaded. Then at the switchover to full pump operation, the soft starter stops the motor.
Siemens has failed to provide a solution. There is a simple solution somehwere here and I hope somebody on this forum has it.
Strangely, the one pump did start perfectly and run once for 30 minutes. However after shutting down and then changing 2 Amp fuses to the softstart 3RW44 neither units could be started again. These 2 Amp fuses kept blowing and Siemens instructed we use 6 Amp fuses later.
I have personally witnessed about 60 or more startup attempts.
The pump is suited to a 230 kva motor, so it is not the pump and it is not the water head either.
I would welcome a solution if possible. We have a case here of technology defeating humans!
Siemens 3rw44 Manual
Siemens Soft Starter User Manual
- The 3RW5 family of soft starters is a comprehensive soft starter portfolio that has been developed for a wide range of applications and is simple to select, install, and configure. These starters are ready for the Internet of Things (IoT), being easily integrated into most industrial communication networks.
- Soft starter operation description 76 Local soft start process 76 Local soft stop process 76 Upon fault condition 77 Remote soft start process (optional) 77 Soft start process through communication (optional) 77 Emergency bypass process 77 Low-voltage test procedure 78 Notes and warnings 78 Soft starter - preparations for insulation resistance.
- SIRIUS soft starters are the best solution when direct-on-line or star/delta starting are not suitable for three-phase motors, because mechanical impacts in the machine or voltage dips in the power supply system can often cause problems.
- The book is not a complete technical guide or manual for all type of ABB Softstarters that may exist on the market. It is a complement to the technical catalogues and brochures we. Direct-on-line (D.O.L) start. When these motors are used together with a softstarter it is possible to reduce the starting current further when compared to motors.
Soft Starter ES software and an operating and monitoring module (display). 2.1.2 Win Soft Starter Selection and Simulation Program This software allows all SIEMENS soft starters to be simulated and selected using various parameters such as network conditions, motor data, load data, special application requirements, etc.