Fans in Series and Parallel v2

196

02:59:40

Car Fans in Low and High Speed .

Oil Pressure Switch and Low Oil Pressure Warning Light added.

The Fans won't run if oil pressure is NOT present in the engine. Other essential processes won't run as well. The Low Oil Pressure Warning Light will run though. 

The Fans run with the switch Open, which returns the Control Relay to it's NC position, and grounding Fan Relay 1. 

When the Fans run, they will initially run in Series, until the other switch (Engine Temperature Switch) closes, grounding Fan Relay 2 and 3, that run the Fans in Parallel. 

When they run in Parallel, the current will increase in each individual Fan, therefore, they will spin at higher RPMs, providing more cooling.

This was done for an Engine Mock-Up we have at our institute.

published 7 years ago

BillyT

7 years ago

Nice design, personally I would place the switching in the positive rails, http://everycircuit.com/circuit/6067812086054912

BillyT

7 years ago

In the final circuit, remember the free wheeling diodes across the relays and the motors.

shaikhimtiyaz

7 years ago

Successful

edv95

7 years ago

Hey there Billy. This is a project we had in tech school. We were given 2 fans and 3 relays and were told to wire the fans in series and parallel. We also had to draw a diagram; which is okay I guess. In the real circuit, the relay grounds are computer controlled. I could of used some transistors instead. I'm still learning myself around 😁

BillyT

7 years ago

Sometimes the design of systems don't keep up with what appears to be best practice, for many reasons I'm not too fond of the negative switching system.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.