PCM-2 Manual.pdf - Voss Associates

NOTE: The gate locks used on the PCM-2 access control unit are electromagnets
which, when energized with the gates open (as in the case of the exit
gate 5-15 seconds after the "All Clear" prompt is posted and the user has
opened the gate to exit) can erase and/or scramble data stored on magnetic
media such as computer flopPY discs, audio and video tape, magnetic ID badges
and credit and bank cards. Therefore users and maintenance personnel should
aviod bringing any such magnetic media in close proximity with the magnetic
exit gate latch when the exit gate is opened for longer than 5 seconds.
System Adjustments
The unit's entry and exit gates are each equipped with a gas cylinder return spring
and air dashpot dampener which interact to smoothly return the exit gate back to
the fully closed and locked position. The gates' dampeners have been adjusted at
Eberline during system assembly to sufficiently decelerate the returning gate from
any open position. Due to variances between the air dashpot components
themselves, each access control unit's dashpots have been uniquely adjusted to
achieve consistent entry and exit gate return actions. Some initial break-in
wearing of the gates' axis bearings and return mechanism components is likely to
occur within the first year of operation which may necessitate subsequent
readjustment of the air dashpots to maintain desireable gate return rates and
smooth gate closure actions.
If either dashpot requires adjustment, first remove the upper cover panel from
atop the PCM-2. The large cylindrical dashpot components are located directly
above the gas return springs in the ceiling assembly of the access control module
(reference 11534-D478, Access Control Ceiling Assembly). The dashpots are
equipped with an adjustable orifice knob at the rear mounting bracket end of the
cylinder which allows infinite adjustability within its dampening range. To adjust
the degree of dampening simply rotate the adjustment knob slightly in the
direction nedded. If more dampening is needed to keep the gate from "slamming"
shut, then rotate the adjustment knob clockwise. If the gate is returning too
slowly and/or is not fully closing against its magnetic lock strike, then rotate the
adjustment knob counter-clockwise. A proper adjusted dashpot should dampen the
return of a fully open and released gate and not take an excessive amount of time
for the gate to close completely against the lock strike on the PCM-2 cabinet.
This is the extent of the mechanical adjustments that the access control unit may
require. However. there are also possible electrical adjustments which can also be
made.
The access control electric circuitry includes a time delay relay which controls the
duration that the exit gate remains unlocked (and the entry gate remains locked)
after a successful "clean" measurement has been performed by PCM-2. This
relay has 16 possible time delay ranges defined by switch settings which allow
between 0.1 seconds to 120 minutes of time delay. An additional rotary knob on
the top of the relay body allows adjustment between the minimum and maximum
17-30 PCM2.MAN/ Rev A/Apri/1995