Wiring Installation; Wiring Diagrams - COOK PLC Installation, Operation And Maintenance Manual

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 mo-
tor 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 com-
mon earth ground to prevent transient voltages from damaging
rotating elements.
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 fil-
ters 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 equip-
ment is fully installed. These resonant frequencies are to be re-
moved 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

Single Speed, 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.
2 Speed, 2 Winding, Single Phase Motor
Ground A
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.
PLC IO&M
Ground A
L 1
Line
L 2
High Speed
L 1
Line
L 2
Low Speed
Single Speed, Single Phase, Dual Voltage
Ground A
T-5
J-10 Low Voltage
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.
3 Phase, 9 Lead Motor
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage High Voltage
230 Volts 460 Volts
4 5 6
4 5 6
7 8 9
1 2 3
1 2
7 8 9
L 1 L 2 L 3 L 1 L 2 L 3
To reverse, interchange any two line leads.
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
2
3
Motor
4
5
6
To reverse, interchange any two line leads. Motors require mag-
netic control.
2 Speed, 2 Winding, 3 Phase
T
3
T
2
T
1
Motor
T
11
T
12
T
13
To reverse:
High Speed - interchange leads T
Low Speed - interchange leads T
Both Speeds - interchange any 2 line leads.
Typical Damper Motor Schematic
Fan
Motor
Transformer**
For 3-Phase, damper motor voltage should be the same be-
tween L and L . For single phase application, disregard L
1 2
*Damper motors may be available in 115, 230 and 460 volt mod-
els. The damper motor nameplate voltage should be verified pri-
or to connection.
**A transformer may be provided in some installations to correct
the damper motor voltage to the specified voltage.
3
Ground A
L 1
Link A
T-5
Link B
Line
J-10
L 2
Ground B
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
230 Volts
8 9
7
5
6 4
3
1 2
3
L 1 L 2 L 3
Low Speed
Together
Motor
L 1
L 2
Line
L 3
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
and T .
11 12
and T .
1 2
Transformer**
Second
Damper
Damper
Motor*
Motor
L 1
Link A
and B
Line
L 2
High Voltage
460 Volts
7 8 9
4 5 6
3
1 2
L 1 L 3
L 2
L 1
1
L 2
2 Line
3
L 3
4
Open
5
6
L
1
L Line
2
L
3
L3
L2
L1
.
3
B51023-002