Signode TENSION-WELD VT-16HD Operation, Parts And Safety Manual page 8

PNEUMATIC INFORMATION, Continued
Several drops of lubricator oil added to the inlet of the air motor or into the air line each day will
help insure good operation. A noticeable reduction of air motor performance can usually be
corrected by squirting a few drops of oil into the air line.
STRAP TENSION
Strap tension is controlled by turning the adjustment screw
(Key 98) as shown by arrow, in 1/4 increment turns counter-
clockwise to increase strap tension and clockwise to reduce
strap tension.
NOTE: Operating air pressure must be set between 85 and 90
psi (5.7-6.2 Bar). With accurately controlled air pressure the
tension will be uniform on all straps, provided the operator
allows the air motor to stall.
Strap can break if inlet air pressure to tool exceeds 90 psig (6.2 bar).
AIR CONSUMPTION
Air consumption in cubic feet per minute (cfm) for the VT can be calculated as follows: cfm = (a) x
(b) x (0.40)
a = Number of straps applied per minute.
b = Number of seconds motor is on per strap during tensioning, from start to deceleration
to stall including stall time while making joint.
0.40 = VT efficiency ratio.
Example Calculation: Peak strapping load is 4 straps/min. so a = 4
Air pressure is assumed to be 90 psig (6.2 Bar) with recommended size and length of air hose.
Volume of air is at room temperature and sea level pressure, or so-called "free air" conditions. For
more detailed information about air supply systems refer to Signode manual Part No. 186038.
Strap breakage hazard.
Strap breakage can result in severe personal injury.
Maximum operating air pressure is 90 psig (6.2 bar).
Air motor is on 5 seconds/strap, so b = 5
VT efficiency ratio is 0.40
6
(a)x(b)x(0.40) 4x5x0.40=8 cubic ft/min.
4x5x0.67=13.4 cubic meters/hr. (13.4M
3
/hr.)
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