Setting trip current:
The EB1 comes from the factory with the trip current set to 2.5 Amps. You can set the trip
current for each district higher by using circuit “shunts”. Shunts are the small black plastic
pieces supplied with the EB1. If no shunt is installed the trip current is 2.5 Amps. The
diagram below illustrates the locations of shunts to set the trip current in 8 increments from
2.5 to 8 Amps.
To install a shunt simply slip it over the indicated pins on the circuit board. The diagram
below shows the settings.
Testing the installation:
After setting the trip current we recommend testing your wiring. The “quarter test” is the
fastest way to test your wiring. Use a coin or other piece of metal to short across the rails at
various places in a power district. The EB1 should trip and shut down the power district at
every place you short out the track. Once shut down the EB1 will try to restore power about
once every 2 seconds. If there is still a short the EB1 will kill the power again, until the short is
removed.
Status Indicator:
There is a status indicator LED near the “SETUP” connector. The LED will light steadily if
everything is OK. A flashing LED indicates the circuit breaker for the power district has
tripped. LED off usually indicates the DCC power booster is turned off.
Optional External Status Indicator:
You may connect an LED for use as a remote status indicator to terminals 3 and 4 of the the
EB1. This LED will duplicate the actions of the small status LED mounted on the EB1.
Current limiting resistors are already mounted on the EB1 so all you need is an LED. The
cathode (minus polarity) of the LED should be connected to terminal 4. Use the diagram on
page 2 as reference for connecting this LED.
Optional Manual Reset:
You may connect an external pushbutton switch (normally open type) as a manual reset to
recover manually from a short circuit. The EB1 must be setup for manual reset for this
feature to work (see the following section on Fine Tuning the EB1). The switch should be
connected between terminals 1 and 2. Use the diagram on page 2 as reference for
connecting this switch.
**Last revised: 23 April 2012
Page 3
EB1
A
B
C
A
B
C
A
B
C
A
B
C
2.5 AMP
3.5 AMP
4 AMP
5 AMP
A
B
C
A
B
C
A
B
C
A
B
C
6 AMP
7 AMP
7.5 AMP
8 AMP
TRIP CURRENT JUMPER SETTINGS
Black "bar" indicates location of shunt
