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Peco 3 Way Turnout & MR204

This article tries to help with the wiring of the Peco PL-E99 3 way Electrofrog Turnout with 2 Point Motors. The turnout has 2 wires connected to the sections of rail that need to have the polarity changed depending on the direction of travel.
The first wiring diagram shows the points wired using the PL-10 motors and the PL-13 switches which sit on top of the motors. These are used to change the polarity of the FROGS.

The Second wiring diagram shows the same set of points wired using our MR204. The advantage to using the MR204 is that you can change the polarity of the FROGS and also send a position indicator back to the Control Panel.
 
Fig 1: This is the Peco SL-E99 3 way Electrofrog Turnout.

Fig 2: This is the Peco SL-E99 3 way Electrofrog showing the sections that need to have their polarity changed.

In the above image the 3 sections of track that are isolated are shown. ON the PL-E99 sections 2 & 3 are pre-connected, so in fact there are only 2 wires on the underside of the turnout. I have shown the position of the motors and designated them PM1 & PM2. I have also shown the 4 positions where you will need Isolating Fishplates, on the left of this image.
 
BASIC WIRING.
The following drawing shows how the Motors PL-10 and the switches PL-9 are connected to the Turnout set.
The Power to the track you may be feeding from a Bus Bar system. If this is the case you will have 5 wires going back to the toggle switches at the control panel.
Please note how the control switches PL-13 are connected to the Motors and then to the mounting bracket PL-9, prior to fitting them to the underside of the baseboard.

SW301
Switch

This drawing shows how the switch and
motor are made up prior to fixing to the
baseboard. A substantial amount of wiring
can be done prior to fitting.
 


The second image shows the hole through
the baseboard (1) 10mm for the actuating
pin (2) to move the throw arm of the points.
 
 
 
 
 

An alternative method of fixing the motors is
to cuta 80mm x 40mm hole in the baseboard
and fit the motors directly to the point set.
The Switch PL-13will still fit onto the motor
as above.
POINT POSITION INDICATOR.
Having wired the points as per the drawing above, we can now add a little extra to stop the 2 motors being out of sequence and giving an indication back at the Control Panel as to which turnout is live.

The table below shows the position of the point motor lever for each motor in the 3 possible turnout positions.
By using our MR204 Latching circuit you can provide a visual indication of the state of the points. This indication will remain even after all power is removed at the end of the day. The circuit below uses 2 No MR204 pcb's one for each motor. These circuits replace the 2 PL-13 motor mounted switches. One set of contacts of the relay controls the FROG polarity, while the other set of the relay contacts controls the LED indicator. The following table shows the LED colour for each position of the points.
A few Pointers.

ITS NOT AS COMPLICATED AS IT LOOKS - YOU ARE ONLY ADDING AN LED, A RESISTOR, AND 6 SHORT PIECES
OF WIRE ABOVE WHAT YOU WOULD HAVE TO DO TO POWER THIS TYPE OF POINTS.
Oh & replacing the PL-13 with MR204's

1) Prior to wiring the Point Motors to the Toggle switches and the MR204's, try to get the motors as follows PM1 in the DOWN position, and PM2 in the UP position.
The reason for this is so that when you wire the toggle switches and the MR204's you should get an Orange LED illumination.
If you don't then toggle PM1 switch down, and PM2 switch up, theoretically this should have no effect on the points but should have synchronised the MR204's to the points.
2) Double check the sequence from the table above to ensure you get the correct LED colour with the points in the position shown.
3) If you are running a DCC system the MR204 will still work, or you can run a separate 12vDC supply for them and the LED.
Tricolour LED
MR204
Cable & Wire
Mini Toggle Switch
In the circuit below we have shown how the MR204 is wired to the Point Motor in the remote setting. Depending on your Power distribution layout this should require only an 8 core cable back to the Control Panel to give full control and indication of this set of points.
Power
Supplies
Resistor