Troubleshooting; Troubleshooting Tips; Exterior Fault Troubleshooting; Bas-Svm04B-En - Trane TR150 Service Manual

Troubleshooting

4 Troubleshooting

4.1 Troubleshooting Tips

Before repairing a frequency converter, read and
understand the following instructions.
1. Note all warnings concerning voltages present in
the frequency converter. Always verify the
presence of AC input voltage and DC link voltage
before working on the unit. Some points in the
frequency converter are referenced to the
negative DC link. They are at DC link potential
even though it sometimes appears on diagrams
to be a neutral reference.
CAUTION
Voltage can be present for as long as 20 minutes on
frequency converters after removing power from the
unit. See the label on the front of the frequency
converter door for the specific discharge time.
2. Never apply power to a unit that is suspected of
being faulty. Many faulty components within the
frequency converter can damage other
components when power is applied. Always
perform the procedure for testing the unit after
repair as described in chapter 4.7 After Repair
Tests.
3. Never attempt to defeat any fault protection
circuitry within the frequency converter, as this
results in unnecessary component damage and
can cause personal injury.
4. Always use factory approved replacement parts.
The frequency converter is designed to operate
within certain specifications. Incorrect parts can
affect tolerances and result in further damage to
the unit.
5. Read the instruction manual. A thorough
understanding of the unit is the best approach. If
ever in doubt, consult the factory or authorised
repair centre for assistance.

4.2 Exterior Fault Troubleshooting

There may be slight differences in servicing a frequency
converter that has been operational for extended time,
compared to a new installation. In either case, use proper
troubleshooting procedures.

BAS-SVM04B-EN

TR150 and TR170 Service Manual
CAUTION
RISK OF INJURY OR PROPERTY DAMAGE
Never assume that a motor is wired properly after a
service of the frequency converter. Check for:
•
•
•
Failure to perform these checks can result in personal
injury, property damage, or less than optimal
performance.
Take a systematic approach, beginning with a visual
inspection of the system. See Table 4.1 for items to
examine.

4.3 Fault Symptom Troubleshooting

The troubleshooting procedures are divided into sections
based on the different occurring symptom.
1.
2.
For each incident, further description explains how to
troubleshoot that particular symptom. When necessary,
further referrals are made to other parts of the manual for
more procedures.
When troubleshooting is complete, perform the list of tests
provided in chapter 6.5 Initial Start-up Or After Repair Drive
Tests.

02/2017 All rights reserved.

Loose connections.
Improper programming.
Added equipment.
See the visual inspection check list in Table 4.1.
Often, incorrect installation or wiring of the
frequency converter causes the problem. The
check list provides guidance through the items to
inspect during servicing of the frequency
converter.
The most common fault symptoms are described
in chapter 4.5 Fault Symptoms:
•
Problems with motor operation.
•
A warning or alarm shown by the
frequency converter.
The frequency converter processor monitors
inputs and outputs as well as internal frequency
converter functions. An alarm or warning does
not necessarily indicate a problem within the
frequency converter itself.
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