Rockwell Automation SA3000 High Power Modules - Manual (Page 40)

4-8 High Power SA3000 AC Power Modules
4.3.2.5 Overtemperature Warning
The Overtemperature Warning bit (bit 7) is set in the Warning register (203/1203) if
the warning level thermal switch (78
o
C (172.4
o
F)) in the SA3000 Power Module
opens. Bit 12 in register 204/1204, 220/1220, or 221/1221 will be set to indicate which
SA3000 Power Module caused the warning.
4.4 Replacing Power Module Fuses and Sub-Assemblies
Follow the procedures given in sections 4.4.1 to 4.4.5 to replace the SA3000 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 534A, 972A, and 1457A SA3000 Power
Modules. Table 4.5 provides fuse specifications.
Step 5. Close the cabinet doors and reapply power to the SA3000 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.