Federal APD PosiDRIVE, Installation, Operation And Maintenance Manual

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10 • PosiDRIVE Structural Overview ZMA-330, Ver.6 PosiDRIVE Security Gate
Drive Mechanism
The drive mechanism in the PosiDRIVE gate is a direct drive, sinusoidal mechanism.
This system provides a substantial mechanical advantage for the motor at the beginning
and ending of a cycle when it is most needed. The result of this is that when the gate is at
the extreme limits of travel, in the “full down” or “full up” position, the mechanism is
“locked” and cannot be manually advanced by pushing the gate arm. In other words, at
the full up and full down positions, the mechanism cannot be driven or advanced by any
torque applied to the mainshaft. When servicing the PosiDRIVE gate, you must be
aware of this.
There are times, such as when setting the mainsprings, when you must operate the
mechanism by hand, using the gate arm. It is also necessary at times during this
procedure and others to ensure that the linkage is in the fully locked up position for
safety. Raising the gate arm by hand will NOT bring the linkage into this position. It will
bring it closed, but it will not be fully locked.
In order to lock the mechanism, you must always advance the mechanism by hand for
the last few degrees of travel. That is, if you raise or lower the arm by hand to what feels
like the limits of its travel, the mechanism still must be manually advanced a small
amount to ensure that it is in the locked position. If the mechanism is already locked,
either up or down, then it becomes impossible to get it out of this position by moving the
gate arm. The mechanism must be manually advanced out of the locked position before
moving the gate arm. This is a side effect of the sinusoidal linkage and the variable
mechanical advantage the system provides.
For instructions on manually advancing the mechanism into and out of the locked
positions, see “Locking, Unlocking, and Advancing the Gate Arm” on page 49.
Electrical Components
The use of a 24 VDC motor in the PosiDRIVE gate provides several electrical benefits.
First, by using a low (non-hazardous) voltage throughout the system, the risk of shock to
service personnel is greatly reduced. The PosiDRIVE gate utilizes a universal input 24
volt power supply. This supply can accept input voltages anywhere from 85 VAC to 264
VAC at 50 or 60 Hz. This allows the PosiDRIVE gate to be installed into virtually any
voltage environment without modification, providing maximum flexibility. The
nameplate rating for power consumption is 2 amps for 115 VAC and 1 amp for 220
VAC.
The PosiDRIVE gate is also equipped with a backup battery assembly, which provides
power to the controller and motor in the event of a power failure to allow the
PosiDRIVE gate to raise the arm. It is not intended to operate the gate in a power failure
mode, but just to provide the option of raising the gate to allow patrons to exit. It also
does not power any loop circuits. Automatically raising the gate during a power failure
is a configurable option. See “Setting the DIP Switches” on page 42.