Softstarter -25C to 50C - PLCS.net

Karsten · June 27th, 2012, 12:04 AM

Hello,

Having a hard time to find a Softstarter for a 11kW motor to be used in low temperature -25C to 50C.

Any ideas?

seppoalanen · June 27th, 2012, 12:46 AM

Put Inverter (VFD) inside the box. Insulate box by Polyurethane, add Rittal's heater inside the box and don't forget the cooler if ambient temp. really is +50.
Finally You have soft starter, soft stopper and variable speed !
On right wall has small heating unit (gray one). On left wall have thermostats for heating, ventilation and interlocking for VFD's supply.
Under -10, electrolytic capacitors can explode, so use Vacon or ABB VFD, others are their "copy".

JesperMP · June 27th, 2012, 02:25 AM

About the low temperature, I agree that you can install a thermostat and heater in the panel.

About the high temperature, 50 degr. C is high but not exceptionally high. In case that the 50 degr. is the exception rather than then norm (*), then a simpler fix than installing a cooler is to derate all equipment inside the panel, i.e. select at least one dimension larger than the nominal size for the load. The mmanufacturers often have recommendations as to how much the equipment must be derated.
I would also consider to avoid any heat-generating equipment inside the panel. Use a direct 400VAC to 24VDC PSU without the typical transformer in between. Choose sofstarters with integral bypass. Use a modern PLC, and not a legacy PLC. Etc...

*: Almost all equipment can operate at 50-60 degr. C. What happens is merely that the equipment age faster than normally. Not so important if the high temperature is an exception to the normal operation.

Karsten · June 28th, 2012, 02:24 PM

Well the problem is the -25C and I can not use heaters. It is a mobile aplication. The Vehicle moves without power to the soft starter. Then it stops, connects to external power and the motor is started. So I can not use heaters.......

jstolaruk · June 28th, 2012, 02:49 PM

Radiator off the vehicles cooling system, just like the vehicle interior.

DickDV · June 28th, 2012, 03:12 PM

Basically, if you cannot use heaters then you cannot use electronic softstarters. All manufacturers of softstarters use commercial grade integrated circuits in their control cards and these are only rated for 0 degrees C or 32 degrees F. The same is true for VFD's.

June 27th, 2012, 12:04 AM	#1
Karsten Member Join Date: Feb 2006 Location: Odense Posts: 113	Softstarter -25C to 50C Hello, Having a hard time to find a Softstarter for a 11kW motor to be used in low temperature -25C to 50C. Any ideas?

June 27th, 2012, 02:25 AM	#3
JesperMP Lifetime Supporting Member + Moderator Join Date: Feb 2003 Location: Copenhagen. Posts: 10,791	About the low temperature, I agree that you can install a thermostat and heater in the panel. About the high temperature, 50 degr. C is high but not exceptionally high. In case that the 50 degr. is the exception rather than then norm (), then a simpler fix than installing a cooler is to derate all equipment inside the panel, i.e. select at least one dimension larger than the nominal size for the load. The mmanufacturers often have recommendations as to how much the equipment must be derated. I would also consider to avoid any heat-generating equipment inside the panel. Use a direct 400VAC to 24VDC PSU without the typical transformer in between. Choose sofstarters with integral bypass. Use a modern PLC, and not a legacy PLC. Etc... : Almost all equipment can operate at 50-60 degr. C. What happens is merely that the equipment age faster than normally. Not so important if the high temperature is an exception to the normal operation. __________________ Jesper

June 28th, 2012, 02:49 PM	#5
jstolaruk Member Join Date: Dec 2004 Location: SE Michigan Posts: 2,090	Radiator off the vehicles cooling system, just like the vehicle interior. __________________ "You can live to be a hundred if you give up all the things that make you want to live to be a hundred." Woody Allen

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June 28th, 2012, 02:24 PM	#4
Karsten Member Join Date: Feb 2006 Location: Odense Posts: 113	Well the problem is the -25C and I can not use heaters. It is a mobile aplication. The Vehicle moves without power to the soft starter. Then it stops, connects to external power and the motor is started. So I can not use heaters.......

June 28th, 2012, 03:12 PM	#6
DickDV Member Join Date: May 2002 Location: Kalamazoo MI Posts: 1,915	Basically, if you cannot use heaters then you cannot use electronic softstarters. All manufacturers of softstarters use commercial grade integrated circuits in their control cards and these are only rated for 0 degrees C or 32 degrees F. The same is true for VFD's.

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