Chapter 6
Troubleshooting
6–20
Auto–Tuning Test Procedure Auto–Tuning is a procedure which involves the running of a group of tests
on the motor/drive combination. Some of these tests check the Drive
hardware and others configure Drive parameters for torque control with the
attached motor.
NOTE: The Quickstart procedure in Chapter 4 will take you step–by–step
throught the Autotuning Procedure. The information presented here
explains how to manually tune specific areas.
ATTENTION: Power must be applied to the Drive and the
motor must be connected for some of the following tests. Some
of the voltages present are at incoming line potential. To avoid
electrical shock hazard or damage to equipment, only qualified
service personnel should perform the following procedures.
!
Test Overview: Auto–Tuning includes 6 tests, all of which can be
performed on a motor which is either coupled or decoupled from load.
These tests include:
The power structure and transistor diagnostics routines let you determine if
any problems exist in the power structure of the drive and determine the
probable cause of these problems.
The diagnostic software determines hardware problems through a series of
system tests. These tests are parameter dependent. The test results depend
on drive size, motor size, system wiring, and other factors that affect
system voltage and load impedance.
In most cases, the software can properly determine if faults exist; however,
there may be some installations where some faults cannot be properly
checked. In general, test results are listed as failed if a questionable case is
found. You must review test results with respect to the whole drive system
to properly interpret whether a real problem exists.
You can run the transistor diagnostics before a start by setting bits 6–8 of
Logic Options (parameter 59). Transistor diagnostics require motor current,
so a user–start transition is required to run the tests.
To run the transistor diagnostics independently:
1. In Autotune/Dgn Sel (parameter 256), set bit 0 to 1.
2. Enable the drive.
The green enable light (D1) turns on very briefly (approximately 300 ms)
and then turns off. This runs only the transistor diagnostics and leaves the
drive disabled after the diagnostics are complete. Autotune/Diagnostics
Selection is automatically cleared to zero after the diagnostics have run.
Power Structure and
Transistor Diagnostics
Tests
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