Installation & Operation 2
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3
MN427
Guarding
WARNING:
Guards must be installed for rotating parts such external fans, and unused shaft extensions,
should be permanently guarded to prevent accidental contact by personnel. Accidental contact
with body parts or clothing can cause serious or fatal injury.
Guards must be installed for rotating parts such as external fans, and unused shaft extensions. This is
particularly important where the parts have surface irregularities such as keys, key ways or set screws.
Some satisfactory methods of guarding are:
1. Covering the machine and associated rotating parts with structural or decorative parts of the driven
equipment.
2. Providing covers for the rotating parts. Covers should be sufficiently rigid to maintain adequate
guarding during normal service.
Electrical Installation
Bypass Mode
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Not Available
All RPM AC cooling tower motors are inverter duty motors using optimum pole design with permanent
magnet rotor construction. They are not intended to be used in bypass mode (across the line). These
motors cannot be run in bypass mode.
WARNING:
Do not touch electrical connections before you first ensure that power has been disconnected.
Electrical shock can cause serious or fatal injury. Only qualified personnel should attempt the
installation, operation and maintenance of this equipment.
WARNING:
The Adjustable Speed Controller may apply hazardous voltages to the motor leads after power to
the controller has been turned off. Verify that the controller is incapable of delivering hazardous
voltages and that the voltage at the motor leads is zero before proceeding. Failure to observe this
precaution may result in severe bodily injury or death.
Caution:
Use only a shielded motor power cable with a complete circumferential braided or copper
film/tape ground jacket around the power leads. This ground should be secured to the motor
frame from within the motor terminal box and must return without interruption to the drive ground.
In addition, if the motor and coupled equipment are not on a single common metal base plate, it is
important to equalize the equipment ground potentials by bonding the motor frame to the coupled
equipment using a high frequency conductor such as a braided strap.
Note: Main power leads for CE Marked Motors may be marked U,V,W – for standard configurations (see
Figure 2-1).
1. Refer to manual MN776 and quick reference guide MS776. Connect all motor leads, thermostat
leads and vibration switch leads to the VS1CTD Cooling Tower control as described.
2. Be sure all connections are secure and proper tightening torque values (MN776) are used.
Figure 2-1 Connection Diagram
3 Phase Single Voltage
P1
P2
U/T1
V/T2
W/T3
T'Stat
L1
L2
L3
Thermostat Leads Connection
As a standard feature, RPM AC cooling tower motors have three (3) normally closed thermostats (one per
phase) connected in series, with leads P1 and P2 terminated in the main conduit box.
To protect against motor overheating, thermostats must be connected to the appropriate controller circuit
(function loss). Failure to connect the thermostats will void the motor warranty. Refer to MN776UG for
correct thermostat lead connections.
This Manual:http://www.manuallib.com/baldor/mn427-inverter-duty-pm-motors-manual.html