Vertiv Liebert MCV440 - Wye vs. Delta Connected Power Supply for EC Fans

Model Voltage FLA WSA OPD
MCV440 + PRE
2 = 380V/60Hz 36.4 37.5 40
A = 460V/60Hz 29.4 30.3 35
G = 415V/50Hz 35.4 36.3 40
B = 575V/60Hz 23.5 24.2 35
MCV430 + PR250
2 = 380V/60Hz 29.4 30.5 35
A = 460V/60Hz 23.8 24.7 25
G = 415V/50Hz 28.5 29.3 30
B = 575V/60Hz 19.0 19.7 30
FLA = Full Load Amps; WSA = Wire Size Amps; OPD = Maximum Overcurrent Protection Device.
Source: DPN005045, Rev. 4
Table 6.3 Heat Rejection Skid Electrical Data, 3 Phase (continued)
NOTE: Heat rejection skids with 12 or 16 fans contain two 3 phase connection boxes, and each box requires a separate
supply input per Table 6.3 below.
6.2 Wye vs. Delta Connected Power Supply for ECFans
Acceptable Power Supplies—380V to 460V Nominal Units
• 380V wye with solidly grounded neutral and 220V line to ground
• 480V wye with solidly grounded neutral and 277V line to ground
• Wye with high resistance (or impedance) ground
• Delta with corner ground
Unacceptable Power Supplies
• Delta without ground or with floating ground
• Delta with grounded center tap
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Vertiv™ Liebert® MCV Installer/User Guide