Quick Start User Guide
t-Boss 7400 ACDC Track Driver
Genesis Technologies Inc.
www.genesisusa.com
Page 5
Ÿ
STROBED RED over continuous GREEN - REVERSED POLARITY - Track circuit polarity is reversed and
track circuit is not shunted, open or disconnected. Although a track circuit may appear to function
properly when the polarity is reversed, this is abnormal and should be corrected.
Ÿ
FLASHING RED slowly - OVERCURRENT - Track circuit output is near the overcurrent fault threshold
(between 5.0A and 6.5A). The cause may be the track circuit limit resistor is adjusted at too low
resistance. The track circuit limit resistor should never be adjusted to less than 1 Ohm. Although a
track circuit may seem to function properly when operated in an overcurrent condition, this is
abnormal and should be corrected.
Ÿ
STROBED RED
1
- OVERCURRENT FAULT - Track circuit output exceeds the overcurrent fault
threshold of 6.5A. All track outputs are shut-down when an overcurrent fault occurs. The system
will resume operation once the overcurrent fault is corrected. The cause may be the track circuit
limit resistor is adjusted at too low resistance. The track circuit limit resistor should never be
adjusted to less than 1 Ohm.)
1
A strobed indication is two quick consecutive flashes each second.
IMPORTANT - The usefulness and accuracy of the T1 through T4 track circuit LED indicators will be
significantly improved if the following guidelines are followed:
1. Use the recommended values for the track circuit limit and relay current adjustment resistor. See
the section ”Selecting and Adjusting Track Limit and Relay Resistors” (
) for information about
the selection and adjustment of track and relay resistors.
2. Make sure the B12 battery voltage is between 11.0 Volts and 14.5 Volts and does not vary more
than ±5% during normal operation.
3. Adjust the track circuit limit resistor to provide approximately 2.5 to 4.5 VAC (track unoccupied) as
read on a Fluke 87 DVM or equivalent.
4. Adjust the relay current resistor to provide approximately 2.5 to 4 times the specified pick-up
current for the track circuit relay when unoccupied.
5.
Never
adjust the track circuit limit resistor to less than 1 Ohm.
R
ESETTING THE T
-B
OSS
7400 T
RACK
S
TATUS
B
ASELINE
M
EMORY
To determine the status of the T1 through T4 outputs, the t-Boss 7400 monitors each output continu-
ously to establish a normal “baseline.” This is done over a period of time and is used to determine
when track circuit conditions change in such a way that may indicate a track circuit fault, such as a
high-resistance bond, broken rail or a failed ring-10 diode.
If you adjust the track circuit resistors after a baseline has been established, the t-Boss 7400 LED indi-
cator for the track circuit that was adjusted may not indicate the track status correctly. Once you have
finished adjusting the track and relay resistors, you should reset the baseline by removing power from
the t-Boss 7400 for several seconds and then restoring power. This can be done by temporarily unplug-
ging the connector to the t-Boss 7400.
If the track circuit resistors are adjusted properly and all track circuits are functioning normally, the t-
Boss 7400 will establish a new baseline and the track circuit LED indicators should indicate correctly.
