Liebert Challenger 3000

3.11 Analog/Digital InputsSelecting ANALOG/DIGITAL INPUTS steps to the following menu:• READ ANALOG INPUTS• SETUP ANALOG INPUTS• READ DIGITAL INPUTS• SETUP DIGITAL INPUTSOperation with Advanced Microprocessor with Graphics Control3.11.1 Read Analog InputsThe four (4) analog sensor inputs can be monitored from the display. The inputs are filtered, then displayedalong with the text label assigned during setup.3.11.2 Setup Analog InputsFor installation of analog sensors, see Analog Setup on page 11.After selecting a compatible sensor and properly wiring it to the terminals, set the control to monitorthe sensor according to the following instructions.SlopeThe slope is a multiplier used to scale the input signal. The slope can be positive (rising) or negative(falling) and can range from 0 (resulting in a horizontal line) to ±999. The slope for a 0-5 volt input isper 1 volt input; for 0-10 volt input, it is per 2 volt input; and for 4-20 mA, it is per 4 mA input. Forexample, assuming an intercept of 0, for a 0-10 volt sensor input with a slope of 50, an input of 1 voltwould be displayed as 25: 1x(50/2); 2 volts would be 50: 2x(50/2); 3 volts would be 75: 3x(50/2); etc.InterceptThe intercept is an offset from point 0 corresponding to 0 volts or 0 mA input. The intercept can bepositive or negative and can be a point from 0 to ±999. Adding an intercept of 100 to the slope exampleabove, 1 volt would be 125: 100 + (1x[50/2]); 2 volts would be 150: 100 + (2x[50/2]); 3 volts would be175: 100 + (3x[50/2]); etc.TextYou may enter a custom label for each analog input. The text label can be 20 characters in lengthincluding any of the following:ABCDEFGHIJKLMNOPQRSTUVWXYZ#%*-0123456789, or space.3.11.3 Read Digital InputsThe four custom alarm inputs can be defined to be digital inputs. Digital inputs are used to sense customerdevices for status display purposes only and will not activate the audible alarm.3.11.4 Setup Digital InputsNOTEFor a 4-20 mA input sensor, if the desired reading at 4 mA input is 0, then an interceptof -1 x slope would be required. For example, assuming a slope of 50, the formula wouldbe ([-1 x 50] + 4 x [50/4]) = 0. The intercept is -50.A digital input is enabled by defining one of the four custom alarms to be STATUS ONLY type in thealarm setup screen. The digital input is given a name by specifying it to be one of the optional alarmsor a custom text alarm. See 3.4.3 - Setup Alarms and 3.4.4 - Setup Custom Alarms.3.12 View Run Hours LogSelecting VIEW RUN HOURS LOG will step to the following menu:• VIEW 24 HOUR RUN TIME HISTORY• VIEW TOTAL RUN HOURS26