34
CAUTION
EQUIPMENT DAMAGE HAZARD
Never use power-factor correction capacitors on motor terminals T1/U, T2/V, or T3/W of the RSi S4
Sensorless Vector Drive. Doing so will damage the semiconductors.
Failure to observe this instruction can result in injury or equipment damage.
ATTENTION
RISQUE DE DOMMAGES MATÉRIELS
Ne raccordez jamais de condensateurs de correction du facteur de puissance aux bornes T1/U, T2/V, ou
T3/W du moteur du variateur de vitesse Sensorless Vector Drive RSi S4. Car cela endommagera les
semiconducteurs.
Si cette directive n’qest pas respectée, cela peut entraîner des blessures corporelles ou des
dommages matériels.
4 - CONNECTIONS
4.2.5 Single Phase Operation
S4 AC drive 230 VAC models are designed for both three-phase and single-phase input power. If one of
these models is operated with single-phase power, derating of 50% is required. Use any two line input
terminals. The output of the device will always be three-phase.
z NOTE: Parameter AFN 28 - Single Phase on page 122 must be activated.
4.2.6 Ground Fault Circuit Interrupters
S4 drives rated for 115VAC are NOT designed to operate with ground fault circuit interrupters (GFCI).
The GFCI breakers are designed for residential use to protect personnel from stray currents to ground.
Most GFCI breakers will shut off at 5 mA of leakage. It is not uncommon for an AC drive to have 30 to 60
mA of leakage.
4.2.7 Motor Lead Length
Adhere to the NEC/CEC and any local codes during the installation of VFD and motor systems. Excessive
lead lengths may adversely effect the performance of the motor. Shielded symmetrical motor cables are
recommended. Lead lengths from VFD to the motor in excess of those listed in the table on page 35 may
require lters to be added to the output of the VFD. The table also lists the suggested maximum lead
lengths for the listed motor types. As a rule of thumb the distance from the S4 drive to the motor should
not exceed 300 meters (1000 feet).
The voltage of the pulses can be almost double at the motor terminals, depending on the motor cable
properties. This in turn can cause additional stress of the motor insulation. Nuisance trips can occur due to
capacitive current ow to ground.
Some applications can have a restricted lead length because of type of wire, motor type or wiring
placement.
Consult the motor manufacturer for more information.
z NOTE: Any non-inverter duty motor should have a reactor or lter added when the motor lead length
exceeds 20 feet. The carrier frequency for the drive should also be reduced using parameter AFN 05 -
Carrier Freq on page 112.
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