6 - 20
Specifications
Liebert CRV - PD - 265086 - 11.01.2018
6.2 Electrical data
Wye vs. Delta Connection Power Supply for CRV
The Liebert CRV EC Fan Model is designed to operate with Wye-connected power. It will not operate
properly with Delta connected power.
A field-supplied isolation transformer or other power solutions will be needed for proper function.
The electronically commutated motors included in the Liebert CRV are suitable for connection to power
supplies with a solidly grounded neutral.
Fig. 6a Wye vs. Delta power supply connection diagram
Acceptable Power Supplies-380V to 460V Nominal Units
(TT System, TNS System or TNC System)
•
380V wye with solidly grounded neutral and 220V line-to-ground
•
460V wye with solidly grounded neutral and 277V line-to-ground.
Unacceptable Power Supplies-380V to 460V Nominal Units
(IT System)
•
Wye with high-resistance (or impedance) ground
•
Delta without ground or with floating ground
•
Delta with corner ground
•
Delta with grounded center tap.
If the unit must be installed in the IT System, contact Vertiv Technical department prior to installation.
Tab. 6c - Electrical data
Wye Power SupplyConnection
Delta Power SupplyConnection
Configuration
Model
Unit Power
supply
FLA [A] LRA [A]
RESIDUAL-CURRENT CIRCUIT
BREAKERS I Δn = 0.3A (400V) (*)
Cooling
Fan+compressor
CR011
230V/1ph/50Hz
16,1
23.10
25 A Curve C
CR021
400V/3ph+N/50Hz
29,5
44.50
32 A Curve C
C Electrical heating
(dehumidification)
Fan +comp electrical
heaters
CR011
230V/1ph/50Hz
36,0
43.00
40 A Curve C
CR021
400V/3ph+N/50Hz
36,0
51.00
40 A Curve C
C Humidification
Fan + com humidifier
CR011
230V/1ph/50Hz
22,6
29.60
40 A Curve C
CR021
400V/3ph+N/50Hz
36,0
51.00
40 A Curve C