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The PTO shouldn't be connected with the
Alltrax....it's a separate circuit. The PTO is just a contactor with
switch/coil-relay to provide direct battery power to the outlet. The motor
can't generate a spike as it's a resistive element. But, if you're
blowing at high load the voltage drops, try to move and if the blower unloads
the voltage will rise...still not sure you can get a spike but if the voltage
drops low enough it might "shut off" the Alltrax SCR's....then a surge might
short the bridge.
Ask Alltrax.
The original E15 circuit was self
limiting....if the voltage dropped from low battery power, you couldn't
move...shut the blower off and there was enough "juice" left to get you back to
the garage. Interesting....
...Walt From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of John Jeno Sent: Monday, December 03, 2007 11:38 PM To: elec-trak cosmos phy tufts edu Subject: (ET) E15 alltrax death I enlisted the help of an EE from work to select a freewheeling diode that will clamp the spike at the blower motor. When we get this mounted and tested I'll pass hardware details in the hopes of preventing someone else from letting the smoke out of the Alltrax. John J You keep typing, we keep giving. Download Messenger and join the i’m Initiative now. Join in! |