Rockwell Automation SB3000 Configuration and Programming - Manual (Page 111)

Performing the Bridge Test G-1
A
PPENDIX
G
Performing the Bridge Test
Important: This test is normally performed at the factory. It should not be necessary
to perform it again unless the power devices or fiber-optic cables are
replaced.
The bridge test is used to verify gate cabling connections by test firing IGBTs one at a
time, cycling through the power module that is enabled. As the IGBTs fire, the LEDs
on the corresponding GDI module in the rectifier’s PMI rack will turn on and off in the
following order:
1. U- Lower Power Device
2. U+ Upper Power Device
3. V- Lower Power Device
4. V+ Upper Power Device
5. W- Lower Power Device
6. W+ Upper Power Device
If the LEDs do not turn on and off in this order, the fiber-optic gate cables have been
connected incorrectly and must be reconnected in accordance with the wiring
diagrams. Three-phase AC Power must be off and the bus capacitors must be
discharged before the cables can be re-connected.
Three-phase AC input power to the SB3000 Rectifier must be turned off and the load
inverter must be disconnected before the bridge test can be enabled. The 115 VAC
control power must be supplied to pick up the pre-charge contactor.
The bridge test will not be permitted to begin if DC bus voltage is greater than 10V.
However, the PMI cannot stop three-phase power from being turned on after the
test has been started. If three-phase AC power is turned on while the bridge test is in
progress there will be a line-to-line short, which may damage the power module and
cause injury to personnel.
!
ATTENTION: Turn off three-phase AC power to the SB3000
Synchronous Rectifier before enabling the bridge test and ensure that
three-phase AC power cannot be turned on while the bridge test is
running. If three-phase AC power is turned on while the bridge test is
running, a line-to-line short will occur. Failure to observe this precaution
could result in bodily injury.