IMPULSE
®
•G+ Mini Technical Manual
November 2020
Page 21
3 Wiring
3.1 Wiring Practices
•
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.
•
Ensure the VFD-to-motor wiring distance is less than 150 ft unless appropriate reactors and/or filters are used.
•
Install a line reactor between the output of the VFD in applications that require a disconnecting means between
the VFD’s output and motor. Use a “make before break” auxiliary contact with the disconnect means and the
hardware base block of the VFD.
•
If the power source is 500 kVA or greater, or more than 10 times the VFD kVA rating, ensure that there is at
least 3 percent impedance between the power source and the VFD input. To accomplish this, you can install a
DC reactor between VFD ter1 and +2, or use an AC line reactor on the input of the VFD. If you don’t
provide enough impedance, excessive peak currents could damage the input power supply circuit.
•
Comply with the circuit protection and wire size recommendations in
•
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 VFD 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 VFD enclosure.
•
Do not connect power factor correction capacitors to the VFD input or output.
•
Hard-wire the VFD and motor (e.g., festoon cable). Do not use sliding collector bars.
•
Shielded cable is recommended for all analog and digital I/O.
•
Before turning on the VFD, 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 feet (76.2 meters) between the VFD 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 VFD's power, properly phase each transformer.
•
To reverse the direction of rotation, interchange any two motor leads (U/T1, V/T2 or W/T3 or change parameter
B03.04.
•
Please observe National Electrical Code (NEC) guidelines when wiring electrical devices.
•
IMPORTANT: All wire connections must have strain relief, and must not apply downward pressure to the
terminals on the VFD.
•
IMPORTANT: In order to maintain the finger-safe properties of the VFD, it must be mounted inside an
enclosure. Adhere to all safety warnings when handling the VFD with live voltage applied to it.
NOTE:
Failure to observe these warnings may result in equipment damage.
WARNING
Before you wire the VFD, review the following practices to help ensure that your system is wired properly.
Summary of Contents for IMPULSE G+ Mini
Page 15: ...IMPULSE G Mini Technical Manual November 2020 Page 15 Figure 2 1 Long Time Storage...
Page 18: ...IMPULSE G Mini Technical Manual November 2020 Page 18 Figure 2 4 Diagram C...
Page 181: ......
Page 182: ...IMPULSE G Mini Adjustable Frequency Crane Controls Technical Manual November 2020...
