Magnetek IMPULSE VG+ Series 3, Инструкция по эксплуатации, Страница: 26 / 183

IMPULSE•VG+ Series 3 Instruction Manual - 07/25/05
3-3
IMPULSE•VG+ Series 3 Wiring Practices
• Do not connect the main output terminals (T1, T2, and T3) to the incoming, three-phase AC
source. This will damage the unit!
• Ensure that the drive-to-motor wiring distance is less than 150 ft unless appropriate reactors and/
or filters are used.
• If a device that can interrupt power is installed between the drive and the motor, install a reactor
on the output side of the drive.
• On external user input devices, use hard contact inputs rather than solid-state inputs.
• If the power source is 500 kVA or greater, or more than 10 times the inverter kVA rating, ensure
that there is at least 3 percent impedance between the power source and the drive input. To
accomplish this, you can install a DC reactor between inverter terminals 1 and 2, or use an AC
line reactor on the input of the drive. If you don’t provide enough impedance, excessive peak
currents could damage the input power supply circuit.
• If the user input device is a PLC TRIAC output, use a 5-K, 10-W resistor between the signal and
L2 (X2).
• Comply with “Suggested Circuit Protection Specifications” on page 3-6.
• Use time delay fuses, which are sized at 150% of drive's continuous-rated current, for drive input
protection.
• Use appropriate R-C or MOV type surge absorbers across the coil of all contactors and relays in
the system. Failure to do so could result in noise-related, nuisance fault incidents.
• Use external dynamic braking resistors for all applications.
• Do not ground the drive with any large-current machines.
• Before you use any welding or high-current machines near the crane, disconnect all line and
ground wiring.
• Do not use output contactors between the drive and the motor.
• Do not let the wiring leads come in contact with the drive enclosure.
• Do not connect power factor correction capacitors to the drive input or output.
• Hard-wire the drive and motor (e.g., festoon cable). Do not use sliding collector bars.
• If you have a user input device or interface board that is remote, use shielded cable between the
drive input terminals and the interface output terminals or user input device(s).
• Before turning on the drive, check the output circuit (T1, T2 and T3) for possible short circuits
and ground faults.
• Increase the wire size by one size for every 250 ft. between the drive and motor; suggested for
center driven cranes, trolleys and bridges. (Voltage drop is especially significant at low
frequencies.)
WA R N I N G
Before you wire the drive, review the following practices to help ensure that your system is
wired properly.