Test Procedures; Introduction; Tools Required For Testing - GE AF-650 GP Operating Instructions Manual

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 40 minutes
after power has been removed before touching any internal components to ensure that capacitors have fully discharged.
This section contains detailed procedures for testing unit size 6x series 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. The Disassembly and Assembly
Instructions describe detailed procedures for removing and replacing components, as required.
Frequency converter testing is divided into Static Tests, Dynamic Tests, and Initial Start Up or After Repair Frequency Converter Tests. Static tests are conducted
without power applied to the frequency converter. The purpose of static testing is to check for shorted power components. Most frequency converter problems
can be diagnosed simply with these tests. Static tests are performed with little or no disassembly. Perform these tests on any unit suspected of containing faulty
power components prior to applying power.
Use extreme caution when conducting tests on a powered frequency converter. For dynamic test procedures, main input power is required.
All line powered devices and power supplies are energized at rated voltage. 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.
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 frequency converter Tests.

6.1.1 Tools Required for Testing

Metric socket set 7–19 mm
Socket extensions 100 mm–150 mm (4 in and 6 in)
Torx driver set T10 - T50
Torque wrench 0.675–19 Nm (6–170 in-lbs)
Needle nose pliers
Magnetic sockets
Ratchet
Screwdrivers Standard and Philips
High Power Service Manual for Unit Sizes 6x
Additional Tools Recommended for Testing
Digital volt/ohmmeter (must be rated for 1200 VDC for 690 V units)
Analog voltmeter
Oscilloscope
Clamp-on style ammeter
Test cable p/n 6KAF6H8439
Signal test board p/n 6KAF6H8437
Power supply: 610 - 800 VDC, 250 mA to supply external power to 4
power cards and the control card.
Power supply : 24 VDC, 2 A for external 24 V power supply.
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