Spin Welder User’s Manual
Section 7 – Operational Setup
Page 57
Page 56
Dukane Manual Part Number 403-547-03
Dukane Manual Part Number 403-547-03
CAUTION
Make sure the red lock
ring on the down speed
knob is pulled forward
to its unlocked position
before adjusting it. The
down speed knob should
turn freely.
Down Speed Adjustment
The down speed adjustment on the front of the press
(see Figure 6–5) adjusts the flow of air leaving the
air cylinder during the downward stroke only. The
restoring pressure during the upward stroke is not
affected. The knob has numeric graduations ranging
from 0 to 9 and controls a ten–turn flow valve with a
one–way bypass. There are also two small windows
to view a color–coded internal shaft. The shaft has
eight colored bands. Reading from back to front they
are Green, Yellow, Blue, White, Red, Blue, Gray and
Brown. Pull the red ring forward to unlock the knob
before adjusting it. Once the final speed setting has
been determined, the red ring should be pushed back
to lock the setting in place.
The down speed setting is a flow control device, so
the amount of air released from the air cylinder dur-
ing down stroke is dependent upon the pressure set
by the front panel regulator. Higher pressure gives
a faster down speed. The initial setting should be
approximately 1-
1
/
2
to 2-
1
/
4
turns open at a pres-
sure regulator setting of 40 psi. Excessively high
counterbalance forces may adversely affect the
adjustment range of the down speed control.
Motor Speed Control
The motor speed is controlled by the digital switch
shown in Figure 6–5. This switch has three decades
of control and is used to set the motor RPM as a
percentage of the full rated motor speed. The motor
is an AC motor and its drive frequency is adjusted
as different speeds are selected. The rated motor
speed is nominally 3500 RPM for the 3 HP model
and 1750 RPM for the 5 HP model. The nomograph
shown in Figure 7–7 can be used to set the digital
speed control for the desired motor RPM. Select the
desired RPM from the outer left column (5 HP) or
inner left (3 HP) and read horizontally across to the
right column to obtain the speed setting to enter on
the digital switch. The speed settings are not criti-
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