Emerson Liebert CW User Manual download pdf (Page 50)

Electrical Connections

Table 4 shows the Total Current Distortion level as measured on a single CW181 unit and is typical

of what can be expected in the field on CW181.

Optional Low-Voltage Terminal Package Connections for Downflow Chilled Water Models

CW146 and CW181

Refer to Figure 33.

18. Remote unit shutdown—Two additional contact pairs available for unit shutdown (labeled as

37B & 38B, 37C & 38C). Replace jumpers with field-supplied, normally closed switch that has a

minimum 75VA, 24VAC rating. Use Class 1 field-supplied wiring.

19. Common alarm—On any alarm, two additional normally open dry contacts are closed across

Terminals 94 and 95 and 96 and 97 for remote indication. 1A, 24VAC maximum load. Use Class 1

field-supplied wiring.

20. Main fan auxiliary switch—On closure of main fan contactor, normally open dry contact is

closed across Terminals 84 and 85 for remote indication. 1A, 24VAC maximum load. Use Class 1

field-supplied wiring.

21. Liebert Liqui-tect

shutdown and dry contact—On Liebert Liqui-tect activation, normally

open dry contact is closed across Terminals 58 and 59 for remote indication (Liebert Liqui-tect

sensor ordered separately). 1A, 24VAC maximum load. Use Class 1 field-supplied wiring.

Table 4 Typical TDD for CW181 at 460V

Event Current Harmonic List — 100% Fan Speed

Unfiltered Test Results – 3 Blowers Filtered Test Results - Transformer + 3 Blowers

Order (A) (%) Order (A) (%)

1 13.89 100.0% 1 13.00 100.0%

5 3.29 23.7% 5 0.44 3.4%

7 1.94 14.0% 7 0.33 2.5%

11 1.29 9.3% 11 0.13 1.0%

13 0.92 6.6% 13 0.11 0.9%

17 0.79 5.7% 17 0.66 5.1%

Broad Spectrum TDD 31.7% Broad Spectrum TDD 9.1%

Event Harmonic List — 60% Fan Speed

Unfiltered Test Results – 3 Blowers Filtered Test Results - Transformer + 3 Blowers

Order (A) (%) Order (A) (%)

1 4.77 100.0% 1 4.37 100.0%

5 1.96 41.1% 5 0.38 8.6%

7 1.15 24.2% 7 0.31 7.0%

11 0.34 7.1% 11 0.05 1.2%

13 0.35 7.3% 13 0.05 1.2%

17 0.23 4.9% 17 0.23 5.2%

Broad Spectrum TDD 49.9% Broad Spectrum TDD 14.1%

NOTE

Refer to specification sheet for total unit full load amps, wire size amps and maximum

overcurrent protective device size.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 87 88

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Emerson Liebert CW User Manual Page 50

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