Motor-Related Checks; Calculate Motor Voltage Imbalance; Unit Operation; Vfd Programming Parameters - Trane CSAA Installation, Operation And Maintenance Manual

Start-Up

Motor-Related Checks

• Locate installation manual from the motor
manufacturer for the specific motor installed. This can
be found by contacting the motor manufacturer's
representative. The motor manufacturer's
recommendations take precedence for all matters
related to the start-up and routine maintenance of the
motor.
• Check the motor lubrication for moisture and rust.
– Remove and clean grease plugs to inspect.
– If moisture is present, consult an authorized repair
shop for bearing inspection/replacement. This may
require removal and transport of motor.
– If no moisture is present, refer to the motor
manufacturer's lubrication recommendations for
proper lubrication.
– The motor manufacturer may recommend
lubricating the motor as part of their routine start-
up instructions.
• Check motor winding. An acceptable winding
resistance reading is from 6 meg-ohms to infinity. If
reading is less than 5 mega-ohms, the winding should
be dried out in an oven or by a blower.
• Inspect the entire motor for rust and corrosion.
• Bump-start the unit and confirm the fan wheel rotates
properly, as indicated by the rotation arrow located on
the fan housing.
Note: For motor warranty needs, contact your local Trane
sales office.

Unit Operation

WARNING
Rotating Components!
Failure to follow all safety precautions could result in
rotating components cutting and slashing technician
which could result in death or serious injury.During
installation, testing, servicing and troubleshooting of
this product it may be necessary to work with live and
exposed rotating components. Have a qualified or
licensed service individual who has been properly
trained in handling exposed rotating components,
perform these tasks.
128
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. During installation, testing,
servicing and troubleshooting of this product, it may be
necessary to work with live electrical components.
Have a qualified licensed electrician or other individual
who has been properly trained in handling live
electrical components perform these tasks.
Before complete start-up, bump-start the unit and confirm
the fan wheel rotates properly, as indicated by the rotation
arrow located on the fan housing.
After initial startup:
• Calculate the motor voltage imbalance, notifying the
power company to correct unacceptable imbalances.
• Periodically check the fan belt tension.

Calculate Motor Voltage Imbalance

After startup, measure the motor voltage and amperage
on all phases to ensure proper operation. The readings
should fall within the range given on the motor nameplate.
The maximum allowable voltage imbalance is 2 percent.
Voltage imbalance is defined as 100 times the sum of the
deviation of the three voltages from the average, divided
by twice the average voltage. For example, if the three
measured voltages are 221, 230 and 227, the average
voltage would be 226 volts. The percent of voltage
imbalance is then calculated.
Voltage imbalance =
A = (226-221) + (230-226) + (227-226)
Voltage imbalance = 2.2% (not acceptable)
In the example, 2.2 percent imbalance is not acceptable
and the power company should be notified to correct it.

VFD Programming Parameters

Units shipped with an optional variable frequency drive
(VFD) are preset and run-tested at the Trane factory. If a
problem with a VFD occurs, ensure that the programmed
parameters listed in Table 39
persist after verifying factory parameters are correct, call
Trane Drive Technical Support at 1-877-872-6363. Have the
unit serial number from the drive available for the
technical support representative. The technician will
determine if drive can be repaired or needs to be replaced.
TR150 startup check list available on the HUB - DOC-
116469.
100A
------------------------------------------------- -
 AvgVoltage
2
where:
have been set. If trouble still
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