Quick Start User Guide
t-Boss 7400 ACDC Track Driver
Genesis Technologies Inc.
www.genesisusa.com
Page 3
The purpose of sensing overvoltage or undervoltage and ceasing operation when such conditions exist
is to avoid unpredictable operation when input power is outside the specified operating parameters.
The Genesis t-Boss 7400 provides “clean” shutdown and power-up under all conditions. For example,
should the battery DC input voltage drop below 8.5 VDC, the system immediately shuts down and
remains shut down until the battery voltage recovers to 9.5 VDC. This minimizes the possibility of
erratic signal operation and “gate-pumping” where the signals and gates repeatedly cycle between ON
and OFF, resulting in much confusion to motorists and the risk of damage to vehicles and to the gate
arms.
The track output status LEDs provide indications that reflect the status of each track circuit; normal
non-shunted, normal shunted, open, reversed polarity, near overcurrent threshold and overcurrent.
These LED indicators are primarily intended to aid in troubleshooting track circuit problems. A more
in-depth description is included in the following section, “Using the t-Boss 7400 Front Panel Indicators.”
Application
When and where to use ACDC Track Circuits
ACDC track circuits are well suited where poor rail-wheel shunting for signal operation is expected or
has been experienced due to infrequent train traffic, excess railhead rust and/or contamination, or
lightweight equipment. They are best suited for rail-highway grade crossings where trains are traveling
at or about the same speed and do not stop within the approach circuit before entering the island.
ACDC track circuits are not suitable for signalized crossings where trains or rolling stock are parked or
stopped within the approaches and the signals are required to recover. Also, they must not be overlaid
nor can they be an overlay or wrap with other types of track circuits such as those used with motion
sensors, grade crossing predictors, coded track circuits and other types of track circuits commonly used
in North America.
Using the t-Boss 7400 Front Panel Indicators
Font panel indicator LEDs are intended to help troubleshoot problems with the B12 DC battery input
and the T1, T2, T3 and T4 track circuit outputs and track circuits.
When the t-Boss 7400 is initially powered-up, the LED Front Panel Indicators cycle through a self-test. If
the battery voltage is within the permissible operating range, all track outputs are then powered up.
DC BATT – NORMAL
OR
LO/HI VOLTAGE FAULT I
NDICATOR
A single blue LED indicator shows the status of the battery input voltage to the t-Boss 7400.
Ÿ
ON continuously - DC battery input voltage is within normal operating limits.
Ÿ
FLASHING slowly - DC battery input voltage is near either the low or high acceptable limits oper-
ating threshold.
Ÿ
STROBED
1
- DC battery input voltage is below or above allowable operating limits (system is shut-
down and all track outputs are OFF).
