Liebert CHALLENGER 3000 - Manual (Page 35)

Operation with Advanced Microprocessor with Graphics Control
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3.12.1 View 24 Hour Run Time History
The history of each load for every hour during the past 24 hours is displayed in the run hour history.
The percentage of each hour that the load was on is displayed from 0 to 100% in increments of 5% or
3 minutes. Loads with a variable output are displayed as a percentage of their capacity for an hour.
For example, a variable load that is 50% on for 1/2 of the hour will be displayed as 25% on for that
hour.
3.12.2 View Total Run Hours
The total operating hours of all major components in the unit can be monitored from the display and
are retained in nonvolatile memory. Run times are available for the following:
• Compressor
• GLYCOOL Coil (or Chilled Water Coil as used on Dual Cool Units)
• Fan
• Humidifier
• Reheat 1 (or Hot Water Reheat or SCR Reheats)
• Reheat 2
• Heat Rejection
The component run hours for each individual component can be reset by selecting the run hours dis-
play screen for the desired component, then pressing ENTER within 5 minutes of applying power to
the control. The user will then be prompted to press ENTER to clear the selected component's run
hours.
3.13 Control Circuit board
The control circuit board is located inside the unit behind the LCD display and control key panel.
Open the front panel for access to the board.
The control board includes an adjustment for LCD contrast, nonvolatile memory, DIP switches (which
should not require customer changes), control output LEDs, and jumpers for board configuration. The
jumpers should be placed as follows:
• P5—removed
• P12—removed
• P19—installed on Pins 1 and 2
• P47— installed on Pins 1 and 2
• P48—installed on Pins 1 and 2
• P50—all jumpers installed for 4-20 mA analog inputs. See 4.5.1 - Connecting the Analog Sen-
sors for other configurations.
• P51—removed
3.13.1 LCD Contrast
The level of contrast due to the viewing angle of the LCD can be adjusted using a small thumb wheel
at the upper left of the control board just under the cable going to the display. The control is labeled
RA1.
NOTE
Run hours for a component should be reset ONLY when the component has been replaced.
NOTE
The LCD backlighting will turn on when any key is pressed and will go off 5 minutes after
the last key is pressed.