Lionel cw-80 transformer review,broadway limited emd sw7 switcher,lionel train tracks o gauge,ho scale mbta model trains - And More

This item will be shipped through the Global Shipping Program and includes international tracking. You must have JavaScript enabled in your browser to utilize the functionality of this website. Customers who bought this product also commonly purchased the following combination of items. The CW-80 transformer provides one variable output for running a train, and a second programmable output for powering accessories.
The basis of the unit is a fixed-voltage transformer that has an open-circuit output voltage of 17.9 volts AC. The two transformer output leads are connected through two wires to the controller printed circuit board. NOTE: Unlike most older Lionel non-electronic transformers, the “original” CW-80 does not use the “U” terminals as a commoned Return connection that ties to the common reference of the layout. The black “U” terminals each have black wires that connect to the respective Track and Accessory Triac power controllers on the PC board. Triacs passes through a current sensing ‘resistor’ composed of a 2.8” length of #18 nickel-alloy wire, then to the Return wire to the transformer. The fan diode marking on the board is backwards compared to the way the fan diode is installed. A lever handle is used to control the track voltage and to program the fixed Accessory voltage. Two Triacs provide variable phase control to adjust the effective output voltages of the Track and Accessory terminals. Each of the Triacs is bypassed by a resistor and capacitor in series to reduce transients across the Triacs. Three of the uC pins service the 3 control pushbuttons (which pull down to ground when pressed), 2 pins provide trigger signals for the Triacs, 1 pin controls the green LED, 1 pin monitors the control potentiometer’s wiper voltage, and 1 pin monitors the output of the current sensing circuit.
The current sensing circuit sees an input voltage of about 310 millivolts on the peak of the sinewave at about 5 amps total current.
The “Direction” control button interrupts power to permit cycling of the locomotive’s direction control device.
The “Bell” button injects a negative DC component by interchanging the lengthening and shortening to the opposite half cycles. The output voltage on the Accessory terminal can be programmed to voltages at or below the available 18V maximum. Although special tools are available to fit this head, a straight-bladed screwdriver of the appropriate size will also lock into one edge of the triangle. The air slots for air intake and exhaust are extremely small, probably restricting the circulation of fresh air through the unit. The power transformer is quite hefty compared to Lionel’s earlier non-electronic transformers.


Measure resistance between “A” and “U” – should be very high resistance, but on high resistance meter ranges there may be lower readings while the Triac’s bypass capacitor is charging.
Power doesn’t shut off fully when handle is OFF Potentiometer wiper voltage isn’t going to high enough voltage.
Contact the seller- opens in a new window or tab and request a shipping method to your location. Neither the service provider nor the domain owner maintain any relationship with the advertisers. This version had several problems that were subsequently modified in the “revised” version covered elsewhere. The transformer Return wire feeds the Ground reference of the logic circuits, but it does not connect at all to the “U” terminals on the back of the transformer.
The marked direction would run the fan off the negative half cycle of the AC waveform, which would actually help to minimize the DC component of the current in the core.
The +5V logic power supply is a simple half-wave circuit referenced to the transformer Return side.
A secondary 2 megohm trimmer pot is connected from the control potentiometer wiper to the +5V end. This means that the potentiometer’s output voltage when the lever is OFF must be the expected voltage that the uC has been programmed to expect for OFF. A series RC circuit fed by the appropriate output pin on the microcontroller triggers the gate of each Triac. NOTE: These rather large 1 uF capacitors will cause misleading output voltage readings on a high-impedance digital voltmeter if there is little or no resistance connected from A or B to U at the output. An external 29.4 MHz crystal and associated capacitors and resistor control the clock frequency of the uC. When the button is released, the power is ramped up over a period of 3 seconds, providing a gradual start. The button has a delayed latching response, requiring the button to be held for a minimum of 3 seconds to either engage or disengage the Bell function.
Do not measure output AC voltages with voltmeter unless a loading resistor is also connected across the output. Adjustment potentiometer voltage is ‘backwards’, with zero volts on wiper producing full output, and 3.3V on wiper shutting off the power. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable.
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After passing through the fuse, the Hot side connects to a junction point on the PC board that feeds red wires to the “A” and “B” terminal. Only the positive half of the waveform is amplified, with the negative half sliced off by a Schottky diode connected in shunt across the opamp’s non-inverting input terminal.


As a result, the fan is driven with halfwave DC derived directly from the 18V AC input from the transformer, resulting in an effective DC voltage to the fan is 9 volts. A 78L05 regulator provides a constant voltage for the microcontroller (uC), control handle potentiometer and the current sensing circuit. A simple 10K ohm resistor from the Hot side of the transformer feeds one uC input to provide this information. The potentiometer has a normal rotation range of about 300 degrees, but the lever only swings through a limited portion of this total range.
The secondary trimmer pot provides a small range of adjustability to accommodate variations in the potentiometer’s output. The impedance of the capacitor, even with the Triac shut off, will be much lower than the input impedance of the digital voltmeter, causing virtually the entire available 18 VAC to appear across the meter.
Note that the programming isn’t complete until the control lever is returned to the OFF position. A light bulb makes a good loading resistor since it also gives a visual indication of output voltage.
The transformer is protected by an internal fuse embedded in the primary winding, connected in series with the primary winding. The +5V output has one large electrolytic bypass capacitor and 3 smaller capacitors located near the various load points. The control potentiometer is connected to the PC board via a 3-pin connector, facilitating potentiometer replacement if and when the resistive element or wiper in the potentiometer wears out. As the voltage increases, extra pulses are added onto the leading edge of the gate trigger signal at 300 us. Also, when the lever hits OFF, the Accessory output will momentarily jump to full output, and then assume the desired reduced output. Failure to use a loading resistor will result in measurements that will indicate full output voltage even when the Triac is really shut off. The two Red terminals are tied together internally, and the two Black “U” terminals are the independently-controlled leads. The bulb will not only offer a low resistance shunt to help the meter read correctly, but it will also give a visual indication of what is happening with the output voltage as the lever is changed or the Accessory voltage is programmed. In electronic terminology, these are “pull down” outputs since the control Triacs short the Black terminals to the Return side of the transformer. Reduced voltage may also create starting problems when the fan ages and the bearing bushings offer more friction.




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Category: z 4000 transformer | 28.10.2014


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