Hello! I am building a small automation controller for a single phase Baldor 5HP Motor. It will be controlled by a contact. When the contact closes I need it to turn on the motor and remain on until the contact opens. When the contact opens I need a timer to be initiated for 30-45 seconds. When the timer expires I need the motor to shut off. However I also need it so if the contact closes WITHIN the timer countdown period to clear the timer, keep the motor running and when the contact opens restart the timer.
Basically I have everything I need (including a 2 position holding switch(manual override and auto mode)) to make this all work. Where im stuck is the fusing for the control transformer. I dont even know where to begin on sizing for the primary side and secondary side. I found a formula but im not sure its the right one. Once I get the sizing right what style fuse do I need? I assume it needs to be a time delayed fuse to keep the inrush current from knocking them out.
These are the parts I have received:
Countdown Timer:
https://www.automationdirect.com/ad...er_Relays_1-z-16_DIN_(MS_Series)/MS4SM-CE-ADC
Control Transformer:
https://www.automationdirect.com/ad..._Transformers/240x120_VAC_to_24x12_VAC/PH75PG
Contactor:
https://www.automationdirect.com/ad...actors_-z-_Overloads/32_to_50_Amp/SC-E2-24VAC
Overload Relay:
https://www.automationdirect.com/ad...tactors_-z-_Overloads/32_to_50_Amp/TK-E2-2600
Thanks!
Basically I have everything I need (including a 2 position holding switch(manual override and auto mode)) to make this all work. Where im stuck is the fusing for the control transformer. I dont even know where to begin on sizing for the primary side and secondary side. I found a formula but im not sure its the right one. Once I get the sizing right what style fuse do I need? I assume it needs to be a time delayed fuse to keep the inrush current from knocking them out.
These are the parts I have received:
Countdown Timer:
https://www.automationdirect.com/ad...er_Relays_1-z-16_DIN_(MS_Series)/MS4SM-CE-ADC
Control Transformer:
https://www.automationdirect.com/ad..._Transformers/240x120_VAC_to_24x12_VAC/PH75PG
Contactor:
https://www.automationdirect.com/ad...actors_-z-_Overloads/32_to_50_Amp/SC-E2-24VAC
Overload Relay:
https://www.automationdirect.com/ad...tactors_-z-_Overloads/32_to_50_Amp/TK-E2-2600
Thanks!