Controlled Products Systems Group HTG 320-2 ST - Manual (Page 24)

StrongArm Installation and Reference 14
Brake Valves: When the limit switches are correctly set to trip a little early, the speed of the barrier
arm may decelerated to allow smooth stops. The rate of deceleration is adjusted by the red colored
brake valves, one for each direction of travel. The brake valve closest to the electric motor controls the
close direction (see drawing HTC35 ST on page 12). The brake valve on the left controls the open
direction. If adjustment of a brake valve is necessary, loosen the 9/16" lock nut and turn the adjuster
screw, in ¼ turn increments, with an Allen wrench. The adjustment works opposite of typical, such that
a counter-clockwise will stop the arm more rapidly. The correct brake valve adjustment will allow the
arm to smoothly stop just before the arm reaches full travel. Tighten the 9/16" lock nut on the brake
valve when complete.
Note 1: The brake valves do not control the closing of the arm when the manual bypass knob is pulled.
For adjustment of the manual mode, see step #3 on page 14.
Note 2: Careful adjustment of the open limit switch and brake valve may be especially important in
installations where there is truck traffic and the gate operator is close to the edge of the road. Be aware
that the later the open limit switch trips when the gate is opening, the sooner the open circuit will be
able to accept a safety reverse when the arm is closing. The best adjustment requires a rapid, but
smooth, stop of the arm at the end of the open cycle.
StrongArm (HTG 320) Manual Operation
A bypass valve has been provided that can override the hydraulic lock that normally secures the arm
from being lifted. In the event of a power failure, manual operation is achieved through the following
procedure.
1. Find the manual bypass valve with the black round knob, which is located on the hydraulic pump
just above where the hoses connect. (See drawing HTC35 ST on page 10). Pull and twist the
valve to engage the manual mode. The barrier arm can now be manually lifted, beginning from
the tip, by moving ―hand over hand‖ while walking towards the operator. When the arm is open,
be certain to close the bypass valve to prevent the arm from drifting down.
2. The arm can be manually closed with the same procedure, except that once manually started, the
arm will fully close itself due to the force of gravity.
3. To regulate the speed of closing, during manual operation only, there is a needle valve for flow
adjustment, which is located just above the manual bypass valve (see drawing HTC35 ST on
page 10). If adjustment is necessary, loosen the lock nut and turn the adjuster stem clockwise to
slow the rate of manual closure. The correct adjustment allows the arm to close at a moderate
speed and stop without excessive bouncing at the fully closed position.