Impulse®•G+ & Vg+ Series 4 Wiring Practices - Magnetek Impulse G+ series 4 Instruction Manual

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IMPULSE •G+ & VG+ Series 4 Wiring Practices
Before you wire the drive, review the following practices to help ensure that your system is wired
properly.
• Ensure that the encoder wiring is less than 300 feet unless fiber optic cables are used.
• Ensure that the encoder wiring is isolated from the power wiring.
• Ensure that the encoder wiring shield is grounded only at the drive end.
• Connect the incoming three-phase AC source to terminals R/L1, S/L2, T/L3.
• Connect the Motor leads to terminals U/T1, V/T2, W/T3.
• Install a line reactor between the output of the drive in applications that require a disconnecting
means between the drive's output and motor. Use a "make before break" auxiliary contact with
the disconnect means and the hardware base block of the drive.
• Use hard contacts between the PLC output and the drive 120/24/48 VAC input card. If using a
solid state output from a PLC (TRIAC) to a 120/24/48 VAC input card, use a 5K, 5W resistor
between the signal and X2.
• 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% impedance between the power source and the drive input. To
accomplish this, a DC reactor can be installed between inverter terminals 1 and 2, or an AC line
reactor can be used on the input of the drive. Excessive peak currents could damage the input
power supply circuit if there is not enough impedance provided.
• Comply with "Suggested Circuit Protection Specifications" on page 3-6.
• Use time delay fuses, which are sized at 150% of drive's continuous rated input current, for
wiring 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 using any welding or high-current machines near the crane, disconnect all line and
ground wiring.
• 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; use a sine wave
filter.
• When possible, hard-wire the drive and motor. Do not use sliding collector bars (e.g., festoon
cable).
• If there is 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 (U/T1, V/T2 and W/T3) for possible short
circuits and ground faults.
• Increase the wire size by one gauge for every 250 feet (76.2 meters) between the drive and
motor; suggested for center driven cranes, trolleys, and bridges (voltage drop is significant at
low frequencies).
• When using more than one transformer for the drive's power, properly phase each transformer.
WA R N I N G
IMPULSE®•G+ & VG+ Series 4 Instruction Manual - February 2017
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