Low hp DC motor starting

[jminer99er]

Im adding a new ¾ hp DC motor at 24Vdc to a hydraulic unit. This will be remote operated via mometary push buttons.

My questions is DC rated contactor/motor starter options. The motor is 3/4hp 1800rpm, 4pole, 24Vdc. The nameplate says A.ARM 31.8. I was thinking like nema 2 contactor, but I'm not sure if it's DC rated and have options for 24Vdc coils. Im not fimilar with dc motor starting. What would be some starting installation options?

 

[ptonsparky]

Your chosen contactor should have a DC rating, if it is. Read the specs.

 

[jminer99er]

Yes I understand that, does anyone know know of a dc contactor/starter that is rated for 31A @ 24V from a reputable mfg, or will I have to use this type of solenoid?

 

[ptonsparky]

Yes I understand that, does anyone know know of a dc contactor/starter that is rated for 31A @ 24V from a reputable mfg, or will I have to use this type of solenoid?

https://www.automationdirect.com/adc/shopping/catalog/motor_controls/iec_magnetic_contactors/iec_safety_contactors/cwbs38-33-30c03

May not be exactly what you want but talk to your local supply houses. They should be able to answer your questions as they relate to their products.

Try Grainger.

 

[ptonsparky]

Yes I understand that, does anyone know know of a dc contactor/starter that is rated for 31A @ 24V from a reputable mfg, or will I have to use this type of solenoid?View attachment 2579258

Is there a reason not to use this?

 

[hbiss]

Is there a reason not to use this?

What about overloads?

-Hal

 

[ptonsparky]

What about overloads?

-Hal

Fuse?

 

[jminer99er]

https://www.automationdirect.com/adc/shopping/catalog/motor_controls/iec_magnetic_contactors/iec_safety_contactors/cwbs38-33-30c03

May not be exactly what you want but talk to your local supply houses. They should be able to answer your questions as they relate to their products.

Try Grainger.

Line side is a/c. (Im familiar with nema rated contactors, but not sure if they're engineered for dc loads) Attached is what I'm finding for a dc contactor. It looks overkill for a ¾hp 24v motor?

 

[jminer99er]

 

[jminer99er]

This dc motor is auxiliary incase of complete ac power loss to the hpu

 

[ptonsparky]

If this is DC backup, where is the AC coming into play?

 

[jminer99er]

If this is DC backup, where is the AC coming into play?

Ac is 480V 3ph shore power to the 3ph ac motor inside the the hpu. I loose shore power I can use dc power for emergency to drive hydraulics.