Dynamic Test Procedures; Split Bus Mode - GE AF-650 GP Operating Instructions Manual

Incorrect reading
An incorrect reading indicates a failed fan. Replace the fan.
If the fan is OK, the problem is the wire harness inside the module. Remove the module in question and replace the fan wire harness.
Check 7: Option Cabinet Door Fan (only 63/64)
This checks the wiring between the Rectifier Module and the Option Cabinet Door Fan.
1. Unplug the 8-pin connector from the top of the Rectifier Module. Read the terminals on the wire harness side of the connector (male connector).
Measure between pins 5 and 8. Should read approximately 47 Ω.
2.
Incorrect reading
In incorrect reading could indicate a failed fan or a bad wire harness. Measure the fan resistance at the Option Cabinet Door Fan. If bad, replace the door fan. If
good, replace the wire harness.
Reconnect the 8-pin connector on top of the Rectifier Module.
6

6.3 Dynamic Test Procedures

6.3.1 Split Bus Mode

Powering the drive in the split bus mode allows dynamic testing on the drive in a safer manner.
In the split bus mode, the DC bus in each module is split into two portions. One connects to the DC bus and power card to provide low voltage power for the SMPS.
By powering only the SMPS in each module, the various logic circuits can be tested without the danger of damaging the power components.
The other provides low voltage power to the DC capacitors and the output IGBTs for test purposes. A low voltage power supply connected to the DC bus allows
testing the functionality of the output section safely.
The following procedure will be referred to throughout the dynamic test section.
Powering the Drive in Split Bus Mode
1. Ensure that AC power has been removed and that all DC capacitors are fully discharged.
2. Remove the top and bottom safety covers from each inverter module as well as the top safety cover from the rectifier module.
3. If a motor is connected to the drive, remove all output bus bars from each inverter module. Also remove the brake bus bars if the drive is equipped with
the brake option.
4. Remove the plugs from the 6-pin sockets on each module.
5. Connect the power supply cable (p/n 6KAF6H8766) to the 6-pin sockets of each module.
6. Connect a 610 – 800VDC power supply to the input end of the power supply cable.
7. Apply power to the power supply. The Keypad should light up as if the drive were powered normally.
8. Warning 24, External Fan Failure will be displayed in the Keypad. This is because the fan circuitry is not powered in this mode. This will not affect the
operation.
82
High Power Service Manual for Unit Sizes 6x