P
USH
C
ORP,
I
NC.
SBS81 Series
Manual
11
4.2 Belt Media Tracking
The SBS81 uses electromechanical linear actuators to automatically adjust and hold the
tracking of the Belt Media on the Contact Wheels. The Belt Media cannot be tracked
manually. The user moves the Tracking Wheel by automatically extending or retracting
the Linear Actuator. Moving the Linear Actuator will cause the Belt Media to track from
side to side on the Contact Wheel. The Belt Media can only be tracked while the
Contact Wheels are rotating. The Contact Wheels should be rotated at approximately
500 rpm. Attempting to track the Belt Media at high rpm’s will cause the belt to move too
quickly. The user must select which Tracking Wheel is to be adjusted. The Linear
Actuators cannot be back-driven and will hold their position.
4.3 Achieving Desired Force
The SBS81 uses a passive
80 Series
AFD to supply a compliant force from 2 to 100 lbs.
(8 to 445 N). The passive force device requires the user to provide regulated air
pressure to achieve a desired force output at the Contact Wheels. Use the following
equations to determine the pressure required to achieve the desired output force:
units
Metric
)
89
(
units
English
)
4
.
1
(
s
am
s
a
P
F
P
F
Where:
bar)
or
(psi
pressure
Supply
eels
Contact Wh
at
(N)
force
applied
Net
eels
Contact Wh
at
(lbs.)
force
applied
Net
s
am
a
P
F
F
PushCorp has included a manual regulator in the SBS81 Control Box to allow for quick
set-up. A manually adjustable pressure regulator may be sufficient, but if remote
operation of the force output is needed, then an electrically controlled proportional air
regulator will be required. The accuracy of the force output is directly related to the
precision and quality of the pressure regulator. For the most precise force output a
regulator that operates in a limited range (i.e., 0-15 psi) is required.
4.4 Achieving Desired Belt Media Speed
The Belt Media speed and Output Shaft rpm is controlled via a +/- 10 VDC analog signal
applied to Pins 4 and 5 of the User Interface Connector. The user must scale the
command voltage to the servo motor amplifier from 0 to 10 Volts, which equates to a
Belt Media speed of 0 to 7330 SFPM (Surface Feet Per Minute). The user is
responsible for determining the maximum speed for their Belt Media. The SBS81 is
factory limited to operate at a maximum Output Shaft rotational speed of 2000 rpm
(7330 SFPM Belt Media speed). Figure 2 shows a simple circuit using a linear
potentiometer to control Belt Media speed, however most installations will require a
remote voltage command to vary the Belt Media speed and control the
acceleration/deceleration of the unit.
Copyright
PushCorp, Inc.
2019. All rights reserved