Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 30)

3-8 Diagnostics, Troubleshooting, and Start-Up Guidelines
3.3 PMI Tuning Mode (Automatic Gain Calculation)
The programmer sets the Enable Tuning bit (register 100/1100, bit 1, PMI_TUN@) to
request the PMI Regulator to calculate the values for the control algorithm. (Refer to
the SA3100 Drive Configuration and Programming instruction manual, S3056, for a
complete description of these variables.) Because the calculated values are used in
the control algorithms, this procedure must be performed before the run mode is
selected.
In order for the PMI Regulator to perform these calculations, the interlock tests
described in section 2.3 must have passed successfully.
For the Volts per Hertz regulator, you can tune the characteristic curve by running the
motor unloaded and monitoring motor current when going through the frequency
range of interest. The curve should be modified to avoid excessive current
consumption/transients when going through the frequency range of interest.
When the PMI Regulator has completed the calculations (a process that takes less
than one second), it will set the Automatic Tuning Complete bit (register 200/1200,
bit 1, PMI_ATC@). The PMI Regulator will then return to the idle mode. Turn the
Automatic Tuning Complete bit off.
3.4 Run Mode
Before executing the run mode, perform the automatic gain calculation procedure
(PMI tuning mode) as described in section 3.3. These gain values are used in the
control algorithms. If the gain values are not calculated immediately before entering
run mode, the motor may not run properly. Note that the Interlock tests do not check
the gain values.
To execute the run mode, the programmer sets the Enable PMI Loop bit (register
100/1100, bit 0, PMI_RUN@ ). Before the run mode can be executed, all of the
following conditions are required:
1. The Interlock tests (described in section 2.3) must be passed successfully.
2. If configured, the M-contactor must be closed (refer to section 2.4.1.2).
3. The DC bus must be ready (see section 2.5).
4. The UDC task in the AutoMax rack must be running. The status of the UDC task
is indicated by the UDC Task Running bit (register 100/1100, bit
15,UDC_RUN@).
If any of these requirements is not met or if a fault is latched in the Drive Fault register
(202/1202), the PMI Regulator will remain in the idle mode.
If these requirements are met, the PMI Regulator will execute the run command. At
this time, the PMI Regulator will set bit 0 in register 200/1200 to indicate the run mode
is active.