Xylem IM131R01 AQUAVAR AV II - Manual (Page 21)

Installation Procedures
Electrical Connections continued
Step 8 - Input Line Requirements
Line Voltage
See the Power and Current Ratings table for the allowable fluctuation of AC line voltage for your
particular model. A supply voltage above or below the limits given in the table will cause the
drive to trip with either an overvoltage or undervoltage fault.
When supplying line voltages other than the factory default values (either 230 Vac, 460 Vac or
575 Vac depending on the model), set the Supply Voltage parameter to the appropriate value.
Exercise caution when applying the AQUAVAR controller on low-line conditions.
For example, and AQUAVAR controller will operate properly on a 208 Vac line – but the maximum
output voltage will be limited to 208 Vac. Now if a motor rated for 230 Vac line voltage is
controlled by this drive, higher motor currents and increased heating will result.
Therefore, ensure that the voltage rating of the motor matches the applied line voltage. If other
than 60 Hz output is desired, proper V/Hz can be programmed into the AVII by setting the
Nom Mtr Voltage and Nom Mtr Freq parameters.
Use of Isolation Transformers and Line Reactors
The AQUAVAR controller is is perfectly suitable in most cases for direct connection to a power source
as specified in this manual and the technical nameplate affixed to the unit. There are however a
few cases where a properly sized isolation transformer or line reactor should be employed to
minimize the risk of drive malfunctionor damage or nuisance tripping:
• As noted in Table 7, transformer sizing, when line capacity is greater than 10 times the KVA
rating of the drive. Consult the factory for assistance in sizing the reactor.
• When power factor correction capacitors are employed on the drive’s power source.
• When the power source is known to be subject to transient power interruptions or
significant voltage spikes.
• When the power source supplying the drive also supplies large devices such as DC drives
that contain controller rectifiers.
Table 7: Transformer Sizing for the AQUAVAR Controller
Controller HP 1 2 3 5 7.5 10 15 20 25 30 40 50 60 75
Transformer kVA 2 4 5 9 13 18 23 28 36 42 56 70 90 112
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