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.)
WARNING
Before you wire the drive, review the following practices to help ensure that your system is
wired properly.
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