TB Wood's WFC1000 Series, Инструкции по установке, эксплуатации и обслуживанию

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2.3 Input AC Line Requirements
The allowable AC line voltage fluctuation is -10% to +15% of nominal line voltage. A supply voltage above or
below these limits could cause the inverter to trip out with either an overvoltage or an undervoltage fault.
NOTE:
Caution must
be exercised
when applying
WFC
HT Invert-
ers on low line
c o n d i t i o n s .
For example, a WFC2000 Series Inverter will operate properly on a 208 VAC line. However, the maximum
output voltage will be limited to 208 VAC. If the motor is rated for 230 VAC line voltage, higher motor currents
and increased heating will result. Ensure that the voltage rating of the motor matches the applied line
voltage.
If other than 60 Hz output can be tolerated, proper volts/hertz can be programmed into the inverter by the 53-
FKNEE and 32-FMAX parameters. If you are unsure about this feature, consult Section 4.2 or the factory.
Phase voltage imbalance of the input AC source can cause unbalanced currents and excessive heat in the
input rectifier diodes and in the DC bus capacitors of the WFC
HT . Phase imbalance is calculated by the
following method:
Assume: The voltage from L1 to L2 = La
The voltage from L2 to L3 = Lb
The voltage from L1 to L3 = Lc
The average line voltage = Lavg
Determine the absolute value of the difference between each of the line voltages (La, Lb, & Lc) and Lavg.
(Subtract the two values and disregard the sign of the result.) Consider the results of this calculation to be
Laa, Lba, & Lca.
Phase Imbalance (%) = Laa + Lba + Lca x 100%
2 (Lavg)
Example:
Measured phase voltages of 230, 235, & 240 would result in a calculated phase imbalance of 2.1%.
If the resulting phase imbalance exceeds 2%, consult your local power company or plant maintenance
personnel and ask them to investigate this problem and recommend methods of correcting this condition.
Phase imbalance can be damaging to motors running Across-the-Line also. A 2% imbalance requires a 5%
derating factor on the motor, 3% imbalance requires a 10% derating, 4% requires an 18% derating.
CAUTION: NEVER USE POWER-FACTOR IMPROVEMENT CAPACITORS ON THE WFC HT MOTOR
TERMINALS, M1, M2, AND M3, OR DAMAGE TO THE INVERTER’S SEMICONDUCTORS WILL RESULT.
A. Single Phase Operation
Certain models of WFC HT series AC inverters are designed for single phase input. The output is still 230
VAC, three phase; therefore, do not connect single-phase motors to the inverter’s output terminals
as damage may occur.
Models WFC1001-0 (115 VAC), WFC2000-7 (230 VAC), WFC2001-0, and WFC2002-0 are designed
specifically for single phase input. For other requirements, please contact the factory.
B. Line Starting
WFC HT is designed to provide controlled starting and stopping of AC motors by use of the keypad or
external contacts connected to the control terminal strip. WFC HT may also be started by applying AC power
to terminals L1, L2, and L3. The inverter has line-start-lockout as a standard feature, to prevent automatic
starting when line power is applied. This provision can be defeated by appropriate programming. The
inverter may be started once every two minutes in this mode.
12
WARNING
DISCONNECT POWER BEFORE SERVICING THIS CONTROL.
HAZARDOUS VOLTAGES EXIST UNTIL CHARGE LIGHT GOES OUT.
AVERTISSEMENT
COUPER L’ALIMENTATION AVANT D’ENRERENORE LE DEPANNAGE DU SYSTEME ELECTRIQUE.
VOLTAGE DANGEUREUX EXISTE TANT QUE LA LUMIERE INDICATRICE RESTE ALLUMÉ.
Input Power Transformer Rating
Lavg = La + Lb + Lc
3
Rated HP FHP 1 2 3 5 7-1/2 10 15 20 25 30 40 50 60 75
Minimum 2 2 4 5 9 13 18 25 31 40 46 62 76 90 112
KVA Rating
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