Vacon 50X, Руководство пользователя

Страница: 26 / 132

25 vacon connections
Tel. +358 (0)201 2121 • Fax +358 (0)201 212205
4
4.2 Input Line Requirements
4.2.1 Line Voltage
See “Power and Current Ratings” on chapter 2.2 for the allowable fluctuation of AC line voltage for your
particular Vacon 50X 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.
Exercise caution when applying the Vacon 50X AC drive on low-line conditions.
For example, an Vacon 50X 2-series unit will operate properly on a 208 Vac line, but the maximum output
voltage will be limited to 208 Vac. 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.
4.2.2 Use of Isolation Transformers and Line Reactors
In nearly all cases, the Vacon 50X drive may be connected directly to a power source. However, in the fol-
lowing cases, a properly–sized isolation transformer or line reactor should be utilized to minimize the
risk of drive malfunction or damage:
• When the line capacity exceeds the requirements of the drive (see Section 4.2.3).
• When power factor correction capacitors are used on the drive’s power source.
• When the power source experiences transient power interruptions or voltage
spikes.
• When the power source supplying the drive also supplies large devices (such as DC
drives) that contain controlled rectifiers.
4.2.3 Line Capacity
If the source of AC power to the Vacon 50X drive is greater than 10 times the kVA rating shown in Table 6,
an isolation transformer or line reactor is recommended. Consult VACON for assistance in sizing the re-
actor.
NOTE: Vacon 50X AC drive devices are suitable for use on a circuit capable of delivering not
more than 65,000 rms symmetrical amperes at 10% above the maximum rated voltage.
4.2.4 Phase Imbalance
Phase voltage imbalance of the input AC source can cause unbalanced currents and excessive heat in the
drive’s input rectifier diodes and DC bus capacitors. Phase imbalance can also damage motors running
directly across the line. The phase imbalance should not exceed 2% of the voltage rating.
Drive kW 0.75 1.5 2.2 4.0 5.5 7.5 11 15 18.5 30 37 45 55 75 90 110 150
Drive hp 1 2 3 5 7.5 10 15 20 25 40 50 60 75 100 125 150 200
Transformer kVA 2 4 5 9 13 18 23 28 36 57 70 90 112 150 180 220 250
Table 6:Transformer Sizing for the Vacon 50X Drive
CAUTION
EQUIPMENT DAMAGE HAZARD
Never use power-factor correction capacitors on motor terminals T1/U, T2/
V, or T3/W of the Vacon 50X AC drive. Doing so will damage the
semiconductors.
Failure to follow this instruction can result in injury or equipment damage.