Rockwell Automation SB3000 High Pwr SB3000 AC Pwr Modules (RCS) - Manual (Page 44)

4-10 SB3000 Power Modules (RCS)
4.3.2.11 PMI Fan Loss Warning
The PMI Fan Loss Warning bit (bit 12) is set in the Warning register (203/1203) if there
is no airflow through the PMI rack.
4.3.2.12 Rail Communication Warning
The Rail Communication Warning bit (bit 13) is set in the Warning register (203/1203)
if a rail communication problem occurs and is logged in registers 4, 10, 16, or 22.
4.3.2.13 CCLK Not Synchronized Warning
The CCLK Not Synchronized Warning bit (bit 14) is set in the Warning register
(203/1203) if the CCLK counters in the PMI Processor and UDC module are
momentarily unsynchronized.
4.3.2.14 PMI Communication Warning
The PMI Communication Warning bit (bit 15) is set in the Warning register (203/1203)
if a fiber-optic communication error occurs between the PMI Processor and the UDC
module. Communication errors in two consecutive messages will result in a fault.
4.4 Replacing Power Module Fuses and Sub-Assemblies
Follow the procedures given in sections 4.4.1 to 4.4.4 to replace the SB3000 Power
Module’s fuses and sub-assemblies.
4.4.1 Replacing Fuses
Use the following procedure to replace a fuse that has blown:
Step 1. Turn off and lock out the AC input power.
Step 2. Wait ten minutes to allow the DC bus voltage to dissipate.
Step 3. Open the cabinet doors and check the voltage across the DC bus bars,
347 A,B,C (+ bus) and 345 A,B,C (- bus), with an external voltmeter to ensure
the DC bus capacitors are discharged before touching any internal
components. See figure 4.1.
Step 4. Remove the blown fuse and install the replacement fuse. Figures 4.2 to 4.6
show the locations of the fuses in the 445A, 890A, and 1335A SB3000 Power
Modules. Table 4.5 provides fuse specifications.
Step 5. Close the cabinet doors and reapply power to the SB3000 Power Module.
!
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait ten
(10) minutes for the DC bus capacitors to discharge. Open the cabinet
doors and check the voltage across the DC bus bars, 347 A,B,C (+ bus)
and 345 A,B,C (- bus), with an external voltmeter to ensure the DC bus
capacitors are discharged before touching any internal components.
Failure to observe this precaution could result in severe bodily injury or
loss of life.