Columbia Par Car Convert to Controller

[Jeff104]

@treeshade said ....
Need to know about the 2 diodes in wiring diagram for a Par Car resistor to controller system

 

[Jeff104]

@treeshade let's do this here so others can benefit
what would you like to know about them?
what controller and voltage are you choosing ?

 

[treeshade]

Iam using 36 volts and a model # P1204M-4201 controller. I want to know the (value) of the diodes

 

[Jeff104]

Iam using 36 volts and a model # P1204M-4201 controller

google search a manual for that controller it will show the diodes and the values you need
or at least a part number

the diodes are there to protect the controller from the "ring back" when you turn off the contactors
to be clear the collapsing magnetic field generates a voltage that will go backwards thru the circuit

diodes are a one way valve for electricity they prevent reverse flow when you dont want it

 

[treeshade]

Thanks a whole lot. extremely helpful.

 

[treeshade]

okay: I have made the change : I used your print exactly , with only one change: I used the exiting green wire for the new yellow wire for the Reverse solenoid wire; Everything worked PERFECT! Thanks SOOOO much!

 

[HotRodCarts]

That's good news. Thank you for the follow up.

 

[Jeff104]

okay: I have made the change : I used your print exactly , with only one change: I used the exiting green wire for the new yellow wire for the Reverse solenoid wire; Everything worked PERFECT! Thanks SOOOO much!

glad we could help !

 

[Diode]

You probably should have a third diode on your main solenoid also.

 

[treeshade]

I have a recharge resistor on my main solenoid

 

[Jeff104]

I have a recharge resistor on my main solenoid

i agree with @Diode you also need a third diode on your main solenoid
the Precharge resistor goes on the big terminals
the diode goes on the small terminals
with the stripe on the + side

i am going to edit that drawing to show a 3rd diode