IMPULSE•T Instruction Manual - October 2015
3-3
IMPULSE•T Wiring Practices
• Connect the incoming three-phase AC source to terminals R/L1, S/L2, and T/L3.
• Connect the motor leads to terminals U/T1, V/T2, and W/T3.
• Ensure that the drive-to-motor wiring distance is less than 150 ft (45.72 m) unless appropriate
reactors and/or filters are used.
• Install a line reactor between the output of the drive in applications that require a disconnecting
means between the drive’s output and the motor. Use a “make before break” auxiliary contact
with the disconnect means and the hardware base block of the drive.
• Use 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 5KΩ, 5 Watt 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 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.
• Comply with “Suggested Circuit Protection Specifications and Wire Size” on page 3-7.
• 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 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 (U/T1, V/T2, and W/T3) for possible short
circuits and ground faults.
• Increase the wire size by one size for every 250 ft (76.2 m) 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.
WARNING
Before you wire the drive, review the following practices to help ensure that your system is wired
properly.
To Next Page
Loading...
Need help?
General