Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 26)

3-4 Diagnostics, Troubleshooting, and Start-Up Guidelines
3.1 Idle Mode
The PMI Regulator’s default operating mode after passing the power-up diagnostics
and completing the DC bus pre-charge sequence is idle. When in idle mode, the PMI
Regulator is waiting for a command from the Drive Control register (100/1100) to
change operating modes.
In order for the PMI Regulator to enter the requested operating mode, the Interlock
tests must be passed. If any of the Interlock tests fails or if any fault is latched in the
Drive Fault register (202/1202), the PMI Regulator will remain in the idle mode.
The PMI Regulator will return to the idle mode when it exits any of the other operating
modes.
3.2 Bridge Test Mode
The bridge test mode is used to verify that the power devices in the Power Module
work correctly. Enabling this test turns on the power devices one at a time in a
user-specified pattern. The operator can then measure the voltages produced across
the devices. Note that this test is normally performed at the factory and does not
need to be performed by the user unless one or more power devices have been
replaced. If required, this test should be performed before enabling any other mode of
the PMI Regulator, such as torque minor loop run.
Follow the steps below to perform the bridge test:
Step 1. Stop the drive if it is running. Turn off and lock out input power.
Step 2. Wait five minutes to allow the DC bus voltage to dissipate.
Step 3. Open the Power Module’s cabinet door or chassis cover.
Step 4. Measure the DC bus potential with a voltmeter before working on the drive.
Measure the voltage at the DC bus test points as shown in figure 4.1. When
the DC bus potential is down to less than 5 volts, touch a 50 ohm, 50 watt or
larger resistor between the test points for 20 seconds. This allows any
remaining DC bus voltage to dissipate.
Remove the resistor and re-measure the DC bus potential, which should now
be at 0V.
Step 5. This step and the following steps assume that your installation includes a
terminal block between the Power Module and the motor. Disconnect the
motor leads from the terminal block to which they are connected.
!
ATTENTION:DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait five
(5) minutes for the DC bus capacitors to discharge. Then check the
voltage across the DC bus to ensure the bus capacitors are discharged
before touching any internal components. Failure to observe this
precaution could result in severe bodily injury or loss of life.