McQuay Skyline IM 777-1, Руководство по установке и обслуживанию

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22 McQuay IM 777-1
Service and Maintenance
the other flange. Determine this by accurately measuring
the top width of the grooves.
7
Insert key
F
.
8
Tighten setscrews
D
and capscrews
E
.
9
Put on belts and adjust belt tension. Do not force belts
over grooves. See “Fan Drive Belt Adjustment” on page
24.
10
Before starting the drive, ensure that all keys are in place
and all setscrews and all capscrews are tight. Check and
retighten all screws and retension belts after approximately
24 hours of service.
Adjusting:
1
Slack off belt tension if belts have been installed.
2
Loosen setscrews
D
.
3
Loosen but do not remove capscrews
E
.
4
Remove key
F
.
Note:
This key projects a small amount to provide a grip
for removing.
5
Adjust pitch diameter by opening or closing the movable
flanges by half or full turns.
Note:
Two-groove sheaves are supplied with both grooves
set at the same pitch diameter.
To provide the same pitch diameter for satisfactory
operation, move both movable flanges the same number of
turns. Do not open sheaves more than five turns for
A
belts
or six turns for
B
belts.
6
Replace key
F
.
7
Tighten setscrews
D
and capscrews
E
8
If belts have been installed, readjust belt tension. If belts
have not been installed, install them and adjust belt tension.
Do not force belts over grooves. See “Fan Drive Belt
Adjustment” on page 24.
9
Before starting the drive, ensure that all keys are in place
and all setscrews and all capscrews are tight. Check and
retighten all screws and retension belts after approximately
24 hours of operation.
MVP Variable Speed Sheaves
Mounting:
1
Verify both driving and driven sheaves are in alignment and
the shafts are parallel. The centerline of the driving sheave
must be in line with the centerline of the driven sheave. See
Figure 34.
2
Verify that all setscrews are torqued to the values shown in
Table 14 before starting drive. Check setscrew torque and
belt tension after 24 hours of service.
Adjusting:
1
Adjust motor base forward to release belt tension. Remove
the belts for easier adjustment.
2
Loosen, but do not remove both of the locking setscrews
A
in the outer locking ring by using a hex key or torque
wrench with a hex bit.
3
Adjust sheave to desired pitch diameter by turning the outer
locking ring. Use a spanner wrench or drift inserted into the
three holes that are located 120° apart on the ring.
4
Any pitch diameter can be obtained within the sheave
range. One complete turn of the outer locking ring changes
the pitch diameter 0.233".
5
Do not open sheaves more than the following
•
Do not open
B
sheaves more than 4 3/4 turns for the
A
belts or 6 turns for the B belts.
•
Do not open
C
sheaves more than 9 1/2 turns.
•
Do not open
5V
sheaves more than 6 turns.
•
Do not open
8V
sheaves more than 8 turns.
Figure 33: LVP type sheave adjustment
Section A-A Section A-A
A
B
C
D
E
F
D
E
A
E
C
F
D
A
A