Saturday morning I decided to open up the Economizer box attached to the Tyco Kilovac EV200AAANA to see what this PWM circuit is made of; So I started by unscrewing the voltmeter and then the contactor
from the control board after taking the battery cables off its terminals
After that it was easy to remove this side box/cover
from the control board after taking the battery cables off its terminals
After that it was easy to remove this side box/cover
voilà
and here is the Tyco Economizer: it is actuelly a small PCB with 3307 reference number printed on it: KILOVAC 3-70-3209
and there are quite a few components soldered onto it !
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