76
CLCH-SVX03C-EN
Startup
Determine Fan Speed
Fan speed can be determined using a strobe-type tachometer, or revolution counter.
Check unit vibration if the fan speed is changed more than five percent from the original designed
speed, or if parts such as shafts, fan wheels, bearings, or other drive components are replaced. Do
not exceed the maximum fan speed.
Pay particular attention to any vibration, noise, or overheating of the motor and fan bearings;
however, note that bearings may run warm during break in.
Table 15. Typical sheave diameter and deflection force
Cross
section
Smallest sheave
diameter range
(in.)
Speed (rpm)
range
Belt Deflection Force (lbs)
Super gripbelts and
unnotched gripbands
Gripnotch belts and
notched gripbands
Used belt
New belt
Used belt
New belt
A, AX
3.0–3.6
1,000–2,500
3.7
5.5
4.1
6.4
2,501–4,000
2.8
4.2
3.4
5.0
3.8–4.8
1,000–2,500
4.5
6.8
5.0
7.4
2,501–4,000
3.8
5.7
4.3
6.4
5.0–7.0
1,000–2,500
5.4
8.0
5.7
9.4
2,501–4,000
4.7
7.0
5.1
7.6
B, BX
3.4–4.2
860–2,500
n/a
n/a
4.9
7.2
2,501–4,000
n/a
n/a
4.2
6.2
4.4–5.6
860–2,500
5.3
7.9
7.1
10.5
2,501–4,000
4.5
6.7
7.1
9.1
5.8–8.6
860–2,500
6.3
9.4
8.5
12.6
2,501–4,000
6.0
8.9
7.3
10.9
C, CX
7.0–9.0
500–1,740
11.5
17.0
14.7
21.8
1,741–3,000
9.4
13.8
11.9
17.5
9.5–16.0
500–1,740
14.1
21.0
15.9
23.5
1,741–3,000
12.5
18.5
14.6
21.6
D
12.0–16.0
200–850
24.9
37.0
n/a
n/a
851–1,500
21.2
31.3
n/a
n/a
18.0–20.0
200–850
30.4
45.2
n/a
n/a
851–1,500
25.6
38.0
n/a
n/a
3V, 3VX
2.2–2.4
1,000–2,500
n/a
n/a
3.3
4.9
2,501–4,000
n/a
n/a
2.9
4.3
2.65–3.65
1,000–2,500
3.6
5.1
4.2
6.2
2,501–4,000
3.0
4.4
3.8
5.6
4.12–6.90
1,000–2,500
4.9
7.3
5.3
7.9
2,501–4,000
4.4
6.6
4.9
7.3
5V, 5VX
4.4–6.7
500–1,749
n/a
n/a
10.2
15.2
1,750–3,000
n/a
n/a
8.8
13.2
3,001–4,000
n/a
n/a
5.6
8.5
7.1–10.9
500–1,749
12.7
18.9
14.8
22.1
1,750–3,000
11.2
16.7
13.7
20.1
11.8–16.0
500–1,749
15.5
23.4
17.1
25.5
1,750–3,000
14.6
21.8
16.8
25.0
8V
12.5–17.0
200–850
33.0
49.3
n/a
n/a
851–1,500
26.8
39.9
n/a
n/a
18.0–22.4
200–850
39.6
59.2
n/a
n/a
851–1,500
35.3
52.7
n/a
n/a
