Rockwell Automation 1305 AC Drive, Firmware 1.01-3.00 User Manual - Manual (Page 30)

Chapter 2 – Installation/Wiring
2-14
➁ A 3% reactor at the motor has less effect on the rise time and higher stress on the motor
cable, but will provide a better waveform to the motor. The reactor must have a
turn-to-turn insulation rating of 2100 volts or higher for 460V motors.
➂ Product information not available at the time of printing.
➃ Use length indicated in Table 2.E
Cable Charging Current
While cable length limits for reflected wave protection should
be followed, drives may have additional cable length
restrictions. Long motor cables may require capacitive
charging current in excess of the rating of a smaller drive. To
assure proper operation, limit smaller drives to the distances
listed in Table 2.E , then take the appropriate protection for
voltage reflection listed in Table 2.D . When conflicts arise,
use the smallest distance listed for a given drive size.
Table 2.E Maximum Cable Length (PWM Frequency = 4 KHZ)
Drive
Size Hp Shielded Cable, 14
AWG 4-Conductor Multiple Wire
Conduit 4-Wire
Configuration Unshielded Cable,
14 AWG
4-Conductor
0.5 45m (150ft) ➀ 106m (350ft)
0.75 61m (200ft) ➀ 121m (400ft)
1 68m (225ft) ➀ 152m (500ft)
2 76m (250ft) ➀ 167m (550ft)
3 91m (300ft) ➀ 182m (600ft)
5 152m (500ft) ➀ 212m (700ft)
➀ Information not available at time of printing. Estimated length for a given drive size
should fall somewhere between the shielded cable value and the unshielded cable
value.
IMPORTANT:The cable lengths indicated here are subject to
change, consult factory for latest information.
Common Mode Cores
These will help reduce the common mode noise at the drive
output and guard against nuisance tripping of the drive caused
by capacitive leakage effects. The capacitive currents are
larger at higher PWM frequencies.