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Installation and Operations Manual — Model 400 Series
TROUBLESHOOTING
9
While the pickets and skirt do not serve as principal structural elements, they do provide an
important protective function. The height of the gate and its strength are designed to intercept
and stop the attacking vehicle's load if the force of the impact launches it forward.
1.1.2 Motor Stanchion (and Associated Hydraulic and Control Unit)
The motor stanchion—which is embedded in a concrete foundation—supports the gate
during opening and closing. It houses the hydraulically driven motor that opens and closes
the gate (gate leaf) and also the roller wheels upon which the gate rolls as it moves. During
vehicle impact, its heavy steel tubes transfer the impact loads to the foundation.
The Model 400 Series vehicle barrier operates from a complete, self-contained hydraulic and
control unit housed in a sealed enclosure with locking doors mounted nearby. For
information on the specific hydraulic unit mated with this gate, please refer to the associated
Operation and Maintenance manual provided separately. The hydraulic unit is designed to
operate for long periods with very little maintenance. It contains the hydraulic reservoir
(which is not pressurized), hydraulic pump, and all of the required valves, manifolds, and
flow control devices. An electric motor operates the gear-type hydraulic pump, which
operates by a system pressure switch independent from the gate signal command. The
hydraulic oil from the pump is drawn through a filter and into a manifold that distributes to
an accumulator, then directional flow control valve. The directional control valves are
energized from the PLC and control circuits to allow hydraulic oil to flow through flow
control valves and out to the charlynn motor. The flow control valve monitors the gate
speed. The operating logic controls the valves to ensure the correct gate position based on
input controls from any set of dry contacts, such as limit switches and safety devices.
These components are sized so that the gate will open or close at about one foot per second
(one meter per 3 seconds). The opening/closing speed can be varied—within limits—by
adjusting hydraulic flow control valves, as described later in this manual.
The hydraulic pumping unit also houses the electric pump drive motor and control circuitry.
The motor is typically a three horsepower, 208 / 240-480 volt, three-phase motor (refer to the
associated manual for variances). An overload circuit protects the motor in the event of
power fluctuations. During a power failure the gate can be operated from a hand pump, and it
can also be opened and closed manually. The hydraulic and control unit is typically mounted
B&B ARMR
A Division of B&B Roadway and Security Solutions
04X0 Rev G
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