CLCH-SVX03C-EN
77
Startup
Traq™ Dampers
Figure 70. Proper drive alignment
Align Fan and Motor Sheaves
Align the fan and motor sheaves using a straightedge. The straightedge
must be long enough to span the distance between the outside edges of
the sheaves. When the sheaves are aligned, the straightedge will touch
both sheaves at points
A
through
D
(see
Figure 70
) to confirm the shaft
is parallel. For uneven width sheaves, place a string in the center groove
of both sheaves and pull tight. Adjust the sheaves and tighten the sheave
set screws to the proper torque given in
Table 16
.
Check Multiple Belts
Tighten the belts slightly and rotate the drive several times.
On multiple belt drives, ensure the force of deflection is approximately the
same on each belt by pushing each belt in an equal distance at a point
halfway from each sheave (see
Figure 70
). If this force is not the same for
each belt, the motor and fan shaft are not parallel. Realign as required.
After realignment, tighten the belts again to the standard belt tensioning
specifications. If the force is still not the same for all belts, the belts or
sheaves are worn and must be replaced.
D
Fixed
Sheave
C
B
A
Adjustable
Sheave
Straight
Edge
Lines must
be parallel
Center line
must coincide
Fixed
Sheave
Table 16. Fan and drive compound torque settings (inches)
Screw Size
Hex Key
Square Head
Hex Head
Torque (in.-lb.)
Torque (ft.-lb.)
1/4
1/8
3/8
7/16
66-90
5.5-7.5
5/16
5/32
1/2
1/2
126-164
10.5-13.7
3/8
3/16
9/16
9/16
228-300
19.0-25.0
7/15
7/32
5/8
5/8
348-450
29.0-37.5
1/2
1/4
3/4
3/4
504-650
42.0-54.2
5/8
5/16
15/16
15/16
1290-1390
107.0-116.0
#10
3/32
-
-
28-40
2.3-3.3
Figure 71. Traq damper terminal connections
Traq dampers are low-leak dampers that
modulate and measure airflow. Each Traq
damper module is supplied with a factory-
mounted ventilation control module (VCM) on
the interior of the mixing box module. The VCM
has an input terminal for power and an output
terminal for air velocity (see
Figure 71
). A direct-
digital controller controls the factory-mounted
and wired actuators.
Ventilation Control Module
Velocity (2-10 Vdc)
GND
24 Vac
GND
1TB1-3
1TB1-4
1TB1-5
1TB1-6
