IEPAS01/IEPAF01 POWER MODULE REPLACEMENT
SYSTEM EFFECTS ON MODULE LEDS
E - 2 I-E96-506B1
®
The IEPAS01 module output voltages are factory adjusted at
full load conditions. These output voltages can show minor
changes because of loading, temperature, component aging,
and environment. The IEPAS02 power module does not require
factory calibration, and will automatically adjust its outputs to
compensate for changes that affect the output voltages. The
IEPAS01 module outputs tend to output a higher voltage than
the IEPAS02 modules in systems with a light load. Therefore,
the remaining IEPAS01 modules will share more of the load as
IEPAS02 modules replace them. The IEPAF01 power module
and IEPAF02 power module exhibit these same characteristics.
SYSTEM EFFECTS ON MODULE LEDS
Replacing an IEPAS01 or IEPAF01 power module with an
IEPAS02 or IEPAF02 power module should have no effect on
system operation. Nevertheless, in some cases replacing an
IEPAS01 or IEPAF01 power module with an IEPAS02 or
IEPAF02 power module may cause a remaining IEPAS01 or
IEPAF01 power module status LED to turn red or blinking
green. A red LED may indicate that an output voltage is too low
or an output voltage is too high resulting in an overload condi-
tion (earlier versions of the IEPAS01 or IEPAF01 power mod-
ule). A blinking green LED on an IEPAS01 or IEPAF01 power
module indicates an overload condition because the output is
too high. If one of these effects occurs from replacing an
IEPAS01 or IEPAF01 power module with an IEPAS02 or
IEPAF02 power module, there are two courses of action.
1. Replace the IEPAS01 or IEPAF01 power module with a new
IEPAS01 or IEPAF01 power module. Return the overloading
IEPAS01 or IEPAF01 power module to the factory for testing
and calibration.
2. Replace the IEPAS01 or IEPAF01 power module with an
IEPAS02 or IEPAF02 power module.
NOTE:
System integration testing shows that no disruption of cabi-
net power occurs when replacing an IEPAS01 or IEPAF01 power
module with an IEPAS02 or IEPAF02 power module. Always install
a replacement power module and verify that it is operating properly
before removing a power module.
Refer to Appendix A for IEPAS02 and IEPAF02 power module
jumper settings. Refer to Section 7 for power module replace-
ment procedures. Enhancements to the IEPAS02 and IEPAF02
power modules give the module LEDs additional functionality.
Refer to Table 4-2 for a description of IEPAS02 and IEPAF02
power module LED states.
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