4
Wiring a slow motion motor to drive a crossing gate
The
Grade Crossing Pro/2
will directly drive a slow motion
motor that is typically used with crossing gates such as those
from Tomar. Figure 4 shows how the
Grade Crossing Pro/2
is connected to a motor; the
Grade Crossing Pro/2
can drive
a
max of two motors
(one per gate if you prefer to use
separate motors). If the gates are raised when the signals are
flashing and lower when the signals are not flashing then you
simply need to reverse the motor connections. You can
adjust the speed of the gate motor on the
Grade Crossing
Pro/2
. Using a flat blade screwdriver insert it into the gate
speed adjustment pot (from the top of the circuit board).
Turning the screwdriver clockwise will increase the gate
speed while turning the screwdriver counter-clockwise will
decrease the gate speed. You
MUST
have the GATES
USED configuration switch in the ON position!
M
1
8
Tortoise
TM
Figure 4 – Gate Motor Wiring (Tomar example)
NOTE: You must check the instructions for your gate motor to determine the maximum voltage that the motor can
accept. For example, Tomar uses Circuitron’s Tortoise™ which has a maximum voltage rating of 12V DC or AC. If
the voltage provided to the GCP is greater than the rating on the motor then you will need to add a current limiting
resistor (we recommend a value of 390Ω, ½ watt) in the connection path between one of the
GCP/2
’s GM outputs and
the turnout motor.
Wiring a servo motor to drive a crossing gate
Sensor modes
The
Grade Crossing Pro/2
supports four different sensor (detector) modes: photocell, between-the-rails infrared, across-the-
rails infrared, and external detector. When you purchased this product it either came with photocells, infrared components or
neither (board only, for use with external detectors). The sensor mode is selected using the switches labeled SEN_TYPE and
SEN POL as depicted in Table 2 below.
Photocell
SEN TYPE – OFF
SEN POL - OFF
Between-the-rails Infrared
SEN TYPE – ON
SEN POL - ON
Across-the-rails Infrared
SEN TYPE – ON
SEN POL - OFF
External Detector
SEN TYPE – OFF
SEN POL - ON
Table 2 – Sensor mode selection
