GE Industrial Solutions AF-600 FP High Power (460V_575V 150HP and above) - Manual (Page 70)

6 Test Procedures
6.1 Introduction
Touching electrical parts of frequency converter may be fatal even after equipment has been disconnected from AC power. Wait 20 minutes
for 4x-frame sizes or 40 minutes for 5x-frame sizes after power has been removed before touching any internal components to ensure that
capacitors have fully discharged. See label on front of frequency converter door for specific discharge time.
This section contains detailed procedures for testing frequency converters. Previous sections of this manual provide symptoms, alarms and other conditions which
require additional test procedures to further diagnose the frequency converter. The results of these tests indicate the appropriate repair actions. Again, because
the frequency converter monitors input and output signals, motor conditions, AC and DC power and other functions, the source of fault conditions may exist
outside of the frequency converter itself. Testing described here will isolate many of these conditions as well. Sections 7 and 8, Disassembly and Assembly
Instructions, describes detailed procedures for removing and replacing frequency converter components, as required (4x- or 5x-sized frequency converters,
respectively).
Frequency converter testing is divided into Static Tests, Dynamic Tests, and Initial Start Up or After Repair Drive Tests. Static tests are conducted without power
applied to the frequency converter. Most frequency converter problems can be diagnosed simply with these tests. Static tests are performed with little or no
disassembly. The purpose of static testing is to check for shorted power components. Perform these tests on any unit suspected of containing faulty power
components prior to applying power.
For dynamic test procedures, main input power is required. All devices and power supplies connected to mains are energised at rated voltage.
Use extreme caution when conducting tests on a powered frequency converter. Contact with powered components could result in electrical
shock and personal injury.
Dynamic tests are performed with power applied to the frequency converter. Dynamic testing traces signal circuitry to isolate faulty components.
Both 4x-frame and 5x-frame size frequency converters are covered here. Differences in the procedures are noted, as required. However, the Soft Charge and
Rectifier Circuit Test, Soft Charge Rectifier Test, and Fan Continuity Test sections are independent for 4x-frame and 5x-frame frequency converters.
Replace any defective component and retest the frequency converter with the new component before applying power to the frequency converter as described
in Initial Start Up or After Repair Drive Tests.
AF-650 GP and AF-600 FP High Power Service Manual
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