Quick Start User Guide
t-Boss 7400 ACDC Track Driver
Genesis Technologies Inc.
www.genesisusa.com
Page 9
DC voltage reads 1.0 VDC and the relay coil resistance is 4 Ohms, then 1.0 ÷ 4 = 0.25, or 0.25A (250
milliamps).
About Track Ballast
Good ballast conditions will improve shunting by not absorbing energy provided by the t-Boss 7400
ACDC Track Driver that would otherwise be used for good shunting. We recommend that the
approaches be reasonably free from dirt and other contaminants that would otherwise absorb elec-
trical energy intended to help with shunting.
Pre-cutover Testing and Cutover
Once you have the t-Boss 7400 ACDC Track Driver operating, check the voltage to the rails. In dry
weather conditions with good ballast you should see 2.5 to 4.5VAC, depending on the adjustment of
the track circuit limit resistor. Remember, the track circuit voltage depends on the following three
factors:
1. Rail to rail resistance as affected by ballast, weather, snow and ice melting chemicals, etc.;
2. Settings of the track circuit limit resistor, and to a lesser extent, the relay current adjustment
resistor;
3. Battery input voltage to the t-Boss.
The following tests should be made before cutover:
1. Complete a disarrangement test as required by your railroad’s procedures;
2. Shunt each track circuit with a zero Ohm shunt then check the respective t-Boss 7400 track output
status LED to make sure it is not drawing too much current (LED flashing RED or strobed RED). If it
is, correct the problem before continuing. The problem may be the track circuit limit resistor is set
at too low resistance;
3. Shunt all approaches and the island using an approved 0.06 Ohm shunt to verify proper signal oper-
ation;
4. If possible, watch a train through the approaches and island to verify proper signal operation;
5. Complete any additional tests as required by your railroad or other regulatory agencies.
