13–8–610 Page 37
SECTION 7
BELT DRIVE
Proper drive belt tension and alignment are provided at
the factory, however, good practice dictates checking
the drive alignment and tension after shipment and be-
fore initial start–up.
Sheaves should align straight across the front with a
straight edge. The best tension is just enough tension
to keep belts from “squealing” on start–up.
Excessive belt tension can damage
the equipment. Tension the belts as
shown in FIGURE 7–1.
Belts can be changed when necessary by the following
instructions. First, disconnect, tag and lockout power
to the starter. Then remove the wire guard. Then loos-
en, but do not remove, the four motor foot nuts.
Next, use the adjusting screws in the motor base to
loosen belt tension. Remove the belts, and replace with
new belts. Check for correct belt tension and re–attach
the wire guard.
Interference between the fan and the
orifice can damage equipment. Be
certain the orifice has even clearance
around the fan before starting the
unit.
CHECKING BELT TENSION – Using a spring scale,
apply a perpendicular force to each belt at the midpoint
of the span and measure the deflection. Correct deflec-
tion force and deflection are shown in FIGURE 7–1. To
tighten belts, merely increase the center distance.
When a new set of belts is installed on
a drive, the initial deflection force
should be 1/3 greater than shown in
FIGURE 7–1. Recheck tension fre-
quently during the first 24 hours of
operation.
No.
Deflection
Deflection
Motor
Of
Force Pounds (Newtons)
In
H.P. (KW)
Belts
(per belt)
Inches (mm)
40 (30 KW)
4
6 to 8.5 (1.3 to 1.9)
3/8 (9.5)
50 (37 KW)
4
7 to 10 (1.5 to 2.2)
3/8 (9.5)
FIGURE 7–1 – BELT TENSION 3VX BELTS
DEFLECTION FORCE (LBS) (N)
DEFLECTION (INCHES) (mm)
Summary of Contents for ELECTRA-SCREW EDEQHH
Page 11: ...13 8 610 Page 3 200EDE797 Ref Drawing FIGURE 1 3 PACKAGE OIL LEVEL GAUGE SEPARATOR AIR FILTER...
Page 12: ...13 8 610 Page 4 202EDE797 Ref Drawing FIGURE 1 4 PACKAGE CONTROLLER STARTER BOX...
Page 15: ...13 8 610 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 16: ...13 8 610 Page 8 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 33: ...13 8 610 Page 25 FIGURE 4 10 WIRING DIAGRAM FULL VOLTAGE DUAL CONTROL 204EDE546 Ref Drawing...
Page 34: ...13 8 610 Page 26 FIGURE 4 11 WIRING DIAGRAM WYE DELTA 205EDE546 Ref Drawing...
Page 53: ......
