I still don't know where the.half battery voltage comes from. So the card uses a gate pulse to activate 2rec, and that allows the cap to equalize voltage on both sides of 1rec at the same time, so that 1rec shuts itself down as no current is flowing and thyristors only stay open when there is sufficienty current. When you stop moving the stick forward, the truck is supposed to open that contactor, but doing so while current flows would be bad for the contactor and the motor and would create a huge spike of something across the whole electrical system that would be rough on the whole unit. When this is equal, no more current can flow, and 5rec shuts itself down, thus keeping the cap charged, isolated and ready to do something very important. 1 rec supplies current to the motor and 5rec, which allows current to pass through to the capacitor, which means the capacitor has equal emf acting on it, and so it wants to equalize voltage potential across it's anode and cathode, so it's going to get balanced, with charge on both sides. Now the control card can tell that the cap is charged, so it triggers the gate on 1rec, and 5rec.
2 rec by nature of insufficient current self opens as all thyristors do when charge stops flowing. because they do not flow, there is no current across 2rec.
#CROWN RC 3000 FULL#
This current flows though 2rec, and the directional contactor and the motor, when the capacitor is charged so that it's anode, relative to it's cathode, is at full battery volts, electrons will no longer flow. When you start going forward, the current that goes to the motor is only the current created by charge leaving the cathode of the capacitor while charge enters the anode of the capacitor thus lending a positive charge to the capacitor. Ok so maybe my explanation will be easier to understand, maybe not. Voltage by an amount which is a function of peak motor current, and 2REC turns off. Loop until the capacitor (card terminal l4) is fully charged negative.
Current continues to flow in the 2REC, lC, motor and battery This dischargeĬurrent opposes the battery current through lREC so that the resultant current is zero. When 2REC conducts,Ĭapacitor lC discharges around the circuit composed of lC, 1X, 2REC, and lREC. This charge is now stored on the capacitorĬurrent continues to flow in lREC until the control card fires 2REC. In less than l millisecond (.00l sec.) and 5REC shuts off. This currentĬharges the bottom of lC positive with respect to the battery positive bus.
5REC turns on and allows current to flow T4-T3, lC, lREC, 5REC to T4-T3. The control card then supplies a gate pulse to lREC turning it on to a conducting state, allowingĬurrent to flow from the battery through lREC, motor field, motor armature, sensor, and back to theīattery. The control cardĬhecks that lC is charged and unlocks the gate to lREC and 5REC. After lC charges, 2REC shuts off due to lack of holding current. The control card then supplies a gate pulse to 2REC turning it on to a conducting state, allowingĬurrent to flow from the battery through lC, lX, 2REC, motor field, motor armature, sensor, andīack to the battery. ThisĪpplies power to the control card turning on the PMT driver, which will close the selected directionalĬontactor and complete the circuits to the drive motor. Or reverse lever to either position, and then depressing the accelerator closing the start switch. The control circuit is energized by closing the key switch, seat switch, and moving the forward So if you look at the ev100zx manual, we'd be at least talking about the same page numbers, which is drawing on page 5 and explanation on page 15.
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