Emerson Liebert iCOM User Manual download pdf (Page 43)

Operation

3.9.3 Analog Inputs—Liebert CW and Liebert DS Air-Cooled Units

The Liebert iCOM allows an external sensor or analog device to be connected, scaled and viewed on

the Liebert iCOM large display for Liebert CW and Liebert DS air-cooled units only. These external

devices require optional analog input connections that can be installed on new units at the factory or

added to existing units in the field. The option provides the electrical connection from the Liebert

iCOM control board to the cooling unit’s field-wiring connection area. If a Liebert CW or Liebert DS

air-cooled unit is equipped with this option, then a 0-10VDC, 0-5VDC or a 4-20mA device can be

connected to terminals 41 and 42, 43 and 44, 45 and 46 or 47 and 48. See Table 9 for analog input

availability.

Follow the settings illustrated in Figure 27 and Table 10 to set the input type based on the sensor

output being used. The default analog input is 0-5VDC. Only properly trained and qualified service

technicians should change the analog input type.

Figure 27 Analog connection control board switch

Table 9 Number of analog inputs

Unit Type Number of Analog Inputs

Liebert CW with MBV 4

Liebert CW with 3P (Stem Valve) 3; one used for valve feedback

Liebert DS Air-Cooled (DX) 2; two used for suction pressure management

NOTE

This option is not available on fluid-cooled units. Fluid-cooled units use all four analog inputs

for low and high refrigerant pressure management.

Table 10 Analog connection control board switch position

Analog Input # Input #1 Input #2 Input #3 Input #4

Control Board Switch Number 1 2 3 4 5 6 7 8

Analog Input Device Value

0 to 10VDC Off Off Off Off Off Off Off Off

0 to 5VDC On Off On Off On Off On Off

4 to 20mA On On On On On On On On

Switches #9 and #10 not applicable to Liebert CW or to Liebert DS.

Off

Switch Position

Switches #9 and #10 not

applicable to Liebert CW

or to Liebert DS

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 107 108

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Emerson Liebert iCOM User Manual Page 43