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PSXX Manual Rev: A             Software Rev: F 

 

   

 

[email protected] 

*Designed by Larry Maier 

*Developed by DCC Specialties 

*US Patent 7,810,435 

 

For DCC Use Only 

New! 

Advanced Circuit Design 

New! 

Current Limiting 

New! 

Automatic Timing Delay 

New! 

Block Occupied Functions 

 

The PSXX Circuit Breaker uses a new advanced design to provide a new level of over-current 

protection for your layout. Before the advent of the PSXX, all circuit breakers used a simple 

low resistance switch to turn off the current if it exceeded a set value. The layout is protected, 

but for the time between the onset of the short and the output switch turning off, the fault is 

connected directly across the booster terminals affecting all blocks connected to the booster. 

The booster will supply up to its maximum current trying to maintain the track voltage. 

Currents as high as 48 amperes can result, depending on your booster and wiring. The large 

current draw then means there is no current left for any other block even if they are protected 

by their own circuit breakers. 

The PSXX series is a product of years of research into problems dealing with false overloads 

that cause premature shut down of DCC Boosters and other Circuit Breakers. These false 

overloads are caused by large capacitors used in sound systems, decoders and lighted 

passenger cars. The overload appears as a short circuit until the capacitors are charged. The 

PSXX Series determines if the load is a true short or just an overload due to a discharged 

capacitor. 

PSXX Versions Available:  

PSXX-1, PSXX-2 & PSXX-3  

                                        

 

Advanced Circuit Design

 limits current to selected current value before circuit opens 

regardless of severity of fault 

 

Current Limiting

 will charge sound decoders without exceeding booster current capability 

 

Default Current Limit/Trip Current 2 amperes 

will work correctly for most layouts. 

 

Select Trip current

 values 1 – 10 in integer steps (1, 2, 3, …., 10) using CV 49 

 

Jumper Select Current

 limits of 1, 2, 3, or 4 amperes  

 

PSXX circuit boards are perforated with score lines

 so you can physically separate and 

divide PSXX-2, & PSXX-3 into individual PSXX-1 units if needed. 

 

Power On/Off by DCC:

 Turn on/off output track power with your DCC Throttle! 

The PSXX-1,2,3 Series

 

DCC Circuit Breaker  

Intelligent, Solid State  

 Block Detection and Network Feed Back

 

Manual Rev A [01.22, Software Rev F [07.22]

 

Summary of Contents for PS 1 Series

Page 1: ...t of years of research into problems dealing with false overloads that cause premature shut down of DCC Boosters and other Circuit Breakers These false overloads are caused by large capacitors used in...

Page 2: ...lied to the layout the PSXX can be set to always turn on always remain off power on as needed by DCC command or to use the power status present when the layout was last shut down Outputs for LED Indic...

Page 3: ...t 1 All connections involve two wire inputs from the DCC Booster or Main DCC Power Bus into a PSXX and two wire Outputs to the isolated track block 2 All PSXX circuit breakers are ready to operate wit...

Page 4: ...On Main functions D12 Green LED On indicates DCC power J1 input D7 Green LED On indicates DCC power J2 output D17 Red LED On D7 Green OFF indicates short circuit D18 Blue LED indicates that current li...

Page 5: ...ng more than one PSXX PSXX 2 PSXX 3 insure all input output polarities are the same 3 If you are using a heavier bus wire such as 10 AWG solder a short length of 12 or 14 AWG wire to your heavier bus...

Page 6: ...the PSXX by sending an accessory ON command check your system manual for correct key sequence to accessory address 2042 Refer to CV68 for address limitations c With the Manual Reset jumper in place yo...

Page 7: ...some or all of these trains have more than one locomotive you could have 10 to 15 current drawing units all competing for power in a fairly small area Assuming all the locomotives have efficient moto...

Page 8: ...s is how each district is used In a yard area for example there is a higher risk of derailments occurring with their associated shorts You might want to isolate this area into a separate district so t...

Page 9: ...er Output 2 to track bus JP1 Program Jumper JP1 1 JP1 2 Place jumper on pins 1 2 for Programming JP1 2 JP1 3 Place jumper on pins 2 3 for Operations J4 Block Occupancy J4 1 Input Manual OFF J4 2 GND M...

Page 10: ...pen the switch to reset the PSXX or send an accessory ON command to the PSXX on off command address see Section B item 11 J7 5 TBD J7 6 GND J10 DCC Power In Remote LED Indicator Output J10 1 Remote D1...

Page 11: ...LED The LED is connected directly to the terminals J5 1 and J5 2 have resistors installed on the board that limit the current to about 5mA 780 ohms No resistor is required The remote LED will duplica...

Page 12: ...Accessory Addresses See Section K DCC System Sequential Programming Instructions for Setting Address and Programming CV s The easiest way to address a PSXX circuit breaker is at your workbench The PSX...

Page 13: ...econd address and issue an ON or OFF command 9 Repeat for the third address you want to use 10 Each time you press the ON or OFF key with a new address you should see D17 flash indicating that the PSX...

Page 14: ...he track and the train can be moved Since the photocell is now disarmed you can move the train over the cell without affecting the power status For all systems whenever you enter an address or CV valu...

Page 15: ...unction requires an address 7 Enter the CV number followed by the value The small red LED D17 on the PSXX will blink each time a command is accepted and the CV value is stored correctly in the CV 8 If...

Page 16: ...the solid state switch which allows this connection to be open or closed OFF or ON CV53 Enable Block Current Auto Calibration Default 0 no calibration CV53 66 enables Block Current Auto Calibration th...

Page 17: ...es The CV63 default is 0 Setting CV63 42 will not change the CV value but it will reset the PSXX CV66 controls how the PSXX outputs power to the track when the associated booster is turned on Default...

Page 18: ...the Block Occupied output will flash whenever the photocell is armed The PSXX power output is on The flashing can be inhibited by setting CV67 1 Any other value of CV67 will enable the flashing CV67 d...

Page 19: ...n accessory address you can easily get a feel for the timing involved 5 In normal operating mode not programming mode select an accessory address that has not been programmed into the PSXX 6 Send an a...

Page 20: ...WCH key and switch addresses Digitrax Programming PSXX CVs Using DT400 402 500 Do Setting Addresses First 1 Disconnect PSXX from DCC power 2 Move PSXX JP1 Jumper to Program Position Pins 1 2 3 Turn DC...

Page 21: ...rogram Position Pins 1 2 3 Turn DCC power on 4 Select a locomotive number with the keypad that is unused on your layout 5 Press the F keys and the or key to select POM mode then hit Enter 6 Press or u...

Page 22: ...osition Pins 1 2 3 Turn DCC Power on 4 Use SELECT LOCO to address an unused locomotive number 5 Press PROG ESC key to enter PROGRAM ON MAIN mode 6 Press ENTER to select any unused locomotive number 7...

Page 23: ...rogram Position Pins 1 2 3 Turn DCC Power on 4 Press LOCO to address an unused locomotive number 5 Press PROG key to enter PROG MAIN TRACK mode 6 Press ENTER 7 Continue to press ENTER until CV is in t...

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