Quick Start User Guide
t-Boss 7400 ACDC Track Driver
Genesis Technologies Inc.
www.genesisusa.com
Page 8
amperes. The following table specifies the minimum recommended wire size for wiring inside the
signal bungalow or cabinet. AWG #10 is preferred, which is the maximum wire size the connector will
accommodate.
Each wire should be stripped of insulation to 5/32” or 7mm. Make certain the wire clamp inside the
connector is gripping the bare wire itself and not the insulation. It is also important that no bare wire is
exposed after it is inserted into the wire clamp inside the connector.
DO NOT OVERTIGHTEN THE SCREWS on the connector. It is best to use a screwdriver with a handle
diameter no larger than about ½”. Test the wires after tightening the screw by pulling on them to make
sure they are securely fastened. If you have tools to measure torque when tightening the screws,
tighten to between 4.4 and 5.3 inch-pounds.
CAUTION! DO NOT WORK ON THE CONNECTOR WITH POWER APPLIED.
The wire tightening screws
are at the same potential as the wire clamp, thus when tightening the screw, your screwdriver shaft is
at the same potential as the wire. Avoid inadvertently causing a short by turning off power or discon-
necting the other end of the wire.
Field wiring to the rails should be AWG #6. Circuit resistance between the t-Boss 7400 and the rails
should be kept as low as reasonably possible as this helps to ensure adequate rail-wheel shunting.
Selecting and Adjusting Track Limit and Relay Resistors
Track Limit Resistor
- Suggested track limit and relay adjust resistor values when using a 4 Ohm track
relay are as follows:
●
t-Boss 7400XP - 10 Ohms adjustable (track) and 20 Ohms adjustable (relay)
●
t-Boss 7400SP - 5 Ohms adjustable (track) and 10 Ohms adjustable (relay)
Use your railroad’s recommended procedures for adjusting the track limit and relay resistors. A good
starting place is for both resistors to be adjusted to approximately
⅔
of maximum resistance.
Note: To determine the approximate current draw by the track relay, simply read the DC voltage
across the relay coil and divide that value by the resistance value of the relay coil. For example, if the
CONNECTOR WIRING PINOUTS & MINIMUM WIRE SIZE
PIN
NAME
FUNCTION
MINIMUM WIRE SIZE
01
B12
12VDC BATTERY POSITIVE
AWG #12
2
N12
12VDC BATTERY NEGATIVE
AWG #12
03
T1+
TRACK 1 POSITIVE OUTPUT
AWG #12
04
T1-
TRACK 1 NEGATIVE OUTPUT
AWG #12
05
T2+
TRACK 2 POSITIVE OUTPUT
AWG #12
06
T2-
TRACK 2 NEGATIVE OUTPUT
AWG #12
07
T3+
TRACK 3 POSITIVE OUTPUT
AWG #12
08
T3-
TRACK 3 NEGATIVE OUTPUT
AWG #12
09
T4+
TRACK 4 POSITIVE OUTPUT
AWG #12
10
T4-
TRACK 4 NEGATIVE OUTPUT
AWG #12
