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Safetran's Model S-40EXIT Railroad Highway Crossing Gate is a "default up" mechanism for use in
four-quadrant gate applications. A typical four-quadrant installation will include two standard S-40
mechanisms and two S-40EXIT mechanisms. The Exit gate is designed to raise the arm in a loss of
power condition clearing the exit portion of the crossing. This differs from the standard gate which
is designed to lower the arm in a loss-of-power condition blocking access to the crossing.
While installation and operation differs, the model S-40 mechanism features of gate snubbing, over-
speed control, and maintenance switch circuits have been incorporated into the model
S-40EXIT.
Installation is counterweight-heavy where the arm will be between 70
off, position. This necessitates full power-down drive to horizontal (0
cal (90
0
), utilizing both power-up and power-down gate control circuits. A brake is used to hold the
arm in both the vertical and horizontal positions.
With standard wiring as shown on page 3, positive and negative battery to terminal locations 4 & 5
is always present and serves to supply power to the motor. An additional positive battery "down
control" serves to energize the control relay (K4). External switching by the user is required which
will lower and hold the gate arm at horizontal when the control is energized and will raise the gate
when de-energized. A test link connection "A" is provided that allows raising the gate arm at the
mechanism.
A second test link connection "B" is provided to:
a.) Protect control circuit by opening before using the maintenance switch
b.) Release brake during installation arm torque measurements
Gate-down control energizes the down-control relay to release the brake and make power-down
drive. At 1
0
the power-down contact #7 opens to de-energize the relay and the motor; and to ener-
gize the brake for hold down. Removing gate-down control drops relay K4 to energize the power-up
0
circuit. At 90
the power up contact #8 opens to de-energize the up relay and the motor; and to
energize the brake.
I
NTRODUCTION
O
PERATION
1
0
0
and 83
in a free, or power-
0
) and power-up drive to verti-
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