Liebert 3000 manual Analog/Digital Inputs, View Run Hours Log

Operation with Advanced Microprocessor with Graphics Control

3.11Analog/Digital Inputs

Selecting ANALOG/DIGITAL INPUTS steps to the following menu:

•READ ANALOG INPUTS

•SETUP ANALOG INPUTS

•READ DIGITAL INPUTS

•SETUP DIGITAL INPUTS

3.11.1Read Analog Inputs

The four (4) analog sensor inputs can be monitored from the display. The inputs are filtered, then dis- played along with the text label assigned during setup.

3.11.2Setup Analog Inputs

For 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 monitor the sensor according to the following instructions.

Slope

The 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 is per 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. For example, assuming an intercept of 0, for a 0-10 volt sensor input with a slope of 50, an input of 1 volt would be displayed as 25: 1x(50/2); 2 volts would be 50: 2x(50/2); 3 volts would be 75: 3x(50/2); etc.

Intercept

The intercept is an offset from point 0 corresponding to 0 volts or 0 mA input. The intercept can be positive or negative and can be a point from 0 to ±999. Adding an intercept of 100 to the slope example above, 1 volt would be 125: 100 + (1x[50/2]); 2 volts would be 150: 100 + (2x[50/2]); 3 volts would be 175: 100 + (3x[50/2]); etc.

NOTE

For a 4-20 mA input sensor, if the desired reading at 4 mA input is 0, then an intercept of -1 x slope would be required. For example, assuming a slope of 50, the formula would be ([-1 x 50] + 4 x [50/4]) = 0. The intercept is -50.

Text

You may enter a custom label for each analog input. The text label can be 20 characters in length including any of the following:

ABCDEFGHIJKLMNOPQRSTUVWXYZ#%*-0123456789, or space.

3.11.3Read Digital Inputs

The four custom alarm inputs can be defined to be digital inputs. Digital inputs are used to sense cus- tomer devices for status display purposes only and will not activate the audible alarm.

3.11.4Setup Digital Inputs

A digital input is enabled by defining one of the four custom alarms to be STATUS ONLY type in the alarm setup screen. The digital input is given a name by specifying it to be one of the optional alarms or a custom text alarm. See 3.4.3 - Setup Alarms and 3.4.4 - Setup Custom Alarms.

3.12View Run Hours Log

Selecting VIEW RUN HOURS LOG will step to the following menu:

•VIEW 24 HOUR RUN TIME HISTORY

•VIEW TOTAL RUN HOURS

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