Electrical Connections
80
8.1.3 Delta-Connected Power Supply
For Delta-connected power, the EMC filter must be removed from the VSD unit during installation.
The size of the inverter (C, D, or 2) must be determined by Table 48, based on the unit’s electrical
requirements and horsepower. Failure to disconnect or remove EMC filter from VSD with delta
connected power may result in failure of VSD and the fan motor to operate.
Figure 63 Delta-connected power diagram
Disconnect EMC Filter for Delta-Connected Power for Size C & D Inverters
The EMC filter on the VSD must be disconnected if the Liebert VSD control DS unit will be operated
with Delta-connected power.
1. Disconnect the power supply before working on the unit.
2. Locate the VSD (refer to Figure 1 for the drive’s location on downflow units; see Figure 2 for the
location on upflow units).
3. Remove electrical junction box cover.
4. Using Figure 64, locate the small black plastic tab immediately to the right of the wiring
connection block of the VFD control.
5. Pull the tab to fully extend it, disconnecting the EMC filter from the circuit.
6. Reinstall the electrical junction box cover.
Table 48 Inverter type
Motor
hp
Unit Electrical Requirements, Voltage, Phase, Hz
208-3-60 230-3-60 380-3-60 460-3-60 575-3-60 200-3-50 380/415-3-50
3hp Size C Size C Size C Size C N/A N/A Size C
5hp Size D Size D Size C Size C N/A N/A Size C
7.5hp Size 2 Size 2 Size D Size D N/A N/A Size D
10hp N/A Size 2 Size 2 Size D N/A N/A Size 2
DPN001945
Rev. 0
Phase A
Phase B
Winding C-A
Phase C
Winding A-B
Winding B-C
To Next Page
Loading...
