Originally Posted by knighty
hi Major, thanks for the reply
so the armature is always powered the same way, and you reverse the field coils to reverse the motor ?
I think what has me lost is the forklift controller has 5 contacts, but I can;t see another controller with 5 ?
from googling, I think this is because the current(or voltage?) in the field windings needs to change to adjust the motor speed ?
(going by this
is that right ?
do the modern controllers just work in a better way and so don't need so many contacts ?
had a call back from the forklift company, £8600 for a controller ! (10,600usd)
old forklift, so controller only controls motor speed, hydraulics etc. are separate
EDIT: here http://www.4qd.co.uk/docs/motor-types-detail/
I found this
so... I can run it with a 2 wire controller... yeah ?
(just checking before I buy anything)
still a little confused as to why the old controller had 3 motor connections...
No, you can't use your series wound motor as a shunt motor. The field coils are physically wound differently. Low resistance of series field essentially shorts out battery.
In that diagram the armature is reversed. Notice I said field reversed "relative" to armature. It also shows field weakening, which your old control may or may not have.
4 vs 5 connections. Find the Curtis 1205 wiring diagram using reversing contactors. Note controller connects one terminal to battery positive and to motor. Your old controller might use 2 terminals instead of doubling up on that single. Reason would just be a guess.