6 Test Procedures
6.1 Introduction
WARNING
Touching electrical parts of the adjustable frequency
drive could be fatal even after equipment has been
disconnected from AC power. Wait 20 minutes after
power has been removed before touching any internal
components to ensure that capacitors have fully
discharged. See the label on the front of the adjustable
frequency drive door for specific discharge time.
This section contains detailed procedures for testing
adjustable frequency drive. Previous sections of this
manual provide symptoms, alarms, and other conditions
that require more test procedures to diagnose the
adjustable frequency drive. The results of these tests
indicate the appropriate repair actions. Because the
adjustable frequency drive monitors I/O signals, motor
conditions, AC and DC power and other functions, the
source of fault conditions is not always internal to the
adjustable frequency drive. Testing described in this
chapter isolates many of these conditions as well.
Adjustable frequency drive testing is divided into
•
Static tests
•
Dynamic tests
•
Initial start-up or after repair drive tests
Static tests are conducted without power applied to the
adjustable frequency drive. Most adjustable frequency
drive problems can be diagnosed 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 before applying
power.
WARNING
For dynamic test procedures, line input power is
required. All devices and power supplies connected to
line power are energized at rated voltage. Use extreme
caution when conducting tests on a powered adjustable
frequency drive. Contact with powered components
could result in electrical shock and personal injury.
Dynamic tests are performed with power applied to the
adjustable frequency drive. Dynamic tests are performed
with power applied to the adjustable frequency drive.
Replace any defective component and retest the
adjustable frequency drive with the new component
before applying powe as described in chapter 4.7 After
Repair Tests.
6.1.1 Tools Required
Additional Tools Recommended for Testing
•
Digital volt/ohmmeter (PWM-compatible)
•
Analog voltmeter
•
Oscilloscope
•
Clamp-on style ammeter
•
Split-bus power supply p/n 130B3146
•
Signal test board p/n 176F8437
•
Signal test board extension p/n 130B3147
•
Metric socket set (0.28 - 0.75 in [7–19 mm])
•
Socket extensions (3.94–5.91 in [100–150 mm])
•
Torx driver set (T10–T50)
•
Torque wrench (4.4–168.2 in-lbs [0.5–19 Nm])
•
Needle nose pliers
•
Magnetic sockets
•
Ratchet
•
Screwdrivers
•
ESD protective mat and wrist strap
Test Procedures Service Manual
MG94A222 Danfoss A/S © Rev. 2014-02-10 All rights reserved. 69
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