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+24 VDC Power System User Manual (Section 6013)
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Rev. G
65
6.
Observe the value displayed. Press and hold the FUNCTION SET YES (+) or NO (-) pushbutton until the
desired value or "AUDIBLE NAG OFF" is displayed. Release the pushbutton.
7.
With the desired value or "AUDIBLE NAG OFF" being displayed, press and release the FUNCTION SET
ENTER pushbutton.
8.
“ARE YOU SURE? + -” is displayed. Press and release the FUNCTION SET YES (+) pushbutton. The
display stops flashing.
NOTE!
The audible alarm cutoff reset time period will not be changed and the adjustment mode will be
exited if the FUNCTION SET YES (+) pushbutton is not pressed within 10 seconds of the “ARE YOU
SURE? +
-” prompt.
9.
To return to the beginning of the MCA Logic Tree, press and release the FUNCTION SET YES (+) and
NO (-) pushbuttons simultaneously.
Setting Rectifier Module (PCU) / Converter Module Fan Speed Control (Normal and
Variable Speed) Feature
Description
The Rectifier Modules and Converter Modulers contain a variable-speed fan control circuit. When ambient
temperature drops below a preset non-adjustable value, fan speed is reduced. When the ambient temperature
rises above this preset non-adjustable value, normal fan speed is resumed. This allows audible noise to be
lowered if thermal conditions permit.
This feature can be enabled or disabled by a user via the MCA. The default state is disabled.
When the variable-speed fan feature is enabled by the MCA, the Rectifier Modules and Converter Modules
individually use their internal temperatures to control fan speed. It is therefore possible that, in a system with
many Rectifier Modules and Converter Modules and under certain conditions, some fans will be operating at
higher speed than others.
Enabling or Disabling the Rectifier Module / Converter Module
Variable-Speed Fan Control Feature
Procedure
1.
With "SYSTEM OK" being displayed on the MCA Interface Pad, press and release the FUNCTION SET
ENTER pushbutton.
or
With "## ALARMS ACTIVE" being displayed on the MCA Interface Pad, press and release the
FUNCTION SET ENTER pushbutton. Repeatedly press and release the FUNCTION SELECT DOWN
arrow pushbutton until "FUNCTION MENU" is displayed. Press and release the FUNCTION SET ENTER
pushbutton.
2.
Repeatedly press and release the FUNCTION SELECT DOWN arrow pushbutton until "CONFIGURE
MENU" is displayed.
3.
Press and release the FUNCTION SET ENTER pushbutton.