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| Need Wiring Help For 12 Volt Motor |
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| vtsteam:
Potential problems to look out for (I assumed all parts had suitable specs for your purpose......but here are the possible problems if they aren't) : Switch contacts not rated for relay current, or back EMF. Relay contacts not rated for inductive load of motor Relay arc suppression needed PWM doesn't like output disconnected/connected The first three would mean shortened component life. The last might mean PWM dies. The PWM output problem -- if it happens -- might be solved with velocette's potentiometer shorting method. Though changing direction will still momentarily disconnect the output, so, maybe not. .....Shouldn't happen -- a brushed DC motor is constantly making and breaking current....... so if this PWM is designed for motors, it should handle a switched output. |
| John Rudd:
Following on from VT's testing procedure, I'd suggest using an auto bulb(lamp?) in place of the motor and connect a fuse in series with the +ve supply lead ( use a 5watt bulb and a 1A fuse power the whole thing with a 12v battery before you use a big power supply...might stop any magic smoke coming out. ) |
| bertie_bassett:
from the looks of those joysticks and the info given i thought they had 4 N/O contacts, 2 of which are closed going left, and two going right, with a neutral in the middle where all contacts are open? |
| vtsteam:
John, good idea! Bertie, Well then they'd be 2P3T center off switches. Which would have made things a whole lot easier...... The 64 thousand dollar question, Snub.......... How many positions does the joystick have, 2, or 3? |
| bertie_bassett:
they would indeed! pics seem to be standard N/O contacts in pairs on a standard switch block. [/quote] And, yes, the joysticks have a neutral position with no contacts closed. Thanks for your help! [/quote] unless im mistaken ? makes the direction control with one joystick easy but i think the relays are still needed if you want independant controll on the second joystick, iv got something drawn up but it needs electronic interlocks |
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