COOK QMXD Handbuch für Installation, Betrieb und Wartung - Seite 4
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Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Tolerance
OFFSET
A
Center
Max.
Distance
Gap
W
Up through 12" 1/16"
12" through 48" 1/8"
Over 48"
1/4"
Figure 4
X
Y
Z
Figure 4 indicates where to measure the allowable gap
for the drive alignment tolerance. All
contact points (indicated by WXYZ) are
to have a gap less than the tolerance
shown in the table. When the pulleys
are not the same width, the allowable
gap must be adjusted by half of the
difference in width. Figure 5 illustrates
using a carpenter's square to adjust
the position of the motor pulley until
the belt is parallel to the longer leg of
the square.
Wiring Installation
NOTICE! Lock off all power sources before unit is
wired to power source.
Leave enough slack in the wiring to allow for motor movement
when adjusting belt tension. Some fractional motors have to
be removed in order to make the connection with the terminal
box at the end of the motor. To remove motor, remove bolts
securing motor base to power assembly. Do not remove motor
mounting bolts.
NOTICE! Follow the wiring diagram in the discon-
nect switch and the wiring diagram provided with
the motor. Correctly label the circuit on the main
power box and always identify a closed switch to
promote safety (i.e., red tape over a closed switch).
Use of Variable Frequency Drives
Motors
Motors that are to be operated using a Variable Frequency
Drive (VFD) must be VFD compatible. At a minimum, this
must be a Premium Efficiency motor with Class F insulation.
Motors that are not supplied by Loren Cook Company should
have the recommendation of the motor manufacturer for use
with a VFD.
Grounding
The fan frame, motor and VFD must be connected to a
common earth ground to prevent transient voltages from
damaging rotating elements.
QMX IO&M
ANGULAR
OFFSET/ANGULAR
CENTER
DISTANCE
(CD)
B
GAP
Wiring
Line reactors may be required to reduce over-voltage spikes
in the motors. The motor manufacturer should be consulted
for recommended line impedance and usage of line reactors
or filters if the lead length between the VFD and the motor
exceeds 10 ft (3m).
Fan
It is the responsibility of the installing body to perform coast-
down tests and identify any resonant frequencies after the
equipment is fully installed. These resonant frequencies are
to be removed from the operating range of the fan by using
the "skip frequency" function in the VFD programming. Failure
to remove resonant frequencies from the operating range will
decrease the operating life of the fan and void the warranty.
Wiring Diagrams
GAP
Single Speed, Single Phase Motor
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-1 and T-4.
2 Speed, 2 Winding, Single Phase Motor
T-1
T-4
Ground B
When ground is required, attach to ground A or B with No.
6 thread forming screw. To reverse, interchange T-1 and T-4
leads.
Single Speed, Single Phase, Dual Voltage
Ground A
T-5
J-10
Ground B
When ground is required, attach to ground A or B with No. 6
thread forming screw. To reverse, interchange T-5 and J-10
leads.
4
Ground A
L 1
T-1
Line
T-4
L 2
Ground B
Ground A
High Speed
Low Speed
Ground A
L 1
Link A
T-5
Link B
Line
Low Voltage
J-10
L 2
Ground B
L 1
Line
L 2
L 1
Link A
and B
Line
L 2
B51092-005