User Manual Instruction Manual

4-6

GV6000 AC Drive User Manual

4.4 Recommended Motor Lead Lengths

Important: To reduce nuisance tripping and possible equipment damage, motor lead

length should not exceed (91 meters) 300 feet for any non-Reliance

Electric motor or any non-inverter duty motor.

The length of cable between the drive and motor may be limited for various application

reasons. The primary areas of concern are:

• Insulation damage due to Reflected wave

• Cable charging

When total lead length exceeds 300 feet, nuisance trips caused by capacitive current

flow to ground can occur. Note that these capacitively-coupled currents should be

taken into consideration when working in areas where drives are running. If the motor

lead length must exceed these limits, the addition of output reactors or other steps

must be taken to avoid problems.

Your application may be restricted to a shorter lead length due to:

• The type of wire (shielded or unshielded)

• The placement of wire (for example, in conduit or a cable tray)

• The type of line reactor

• The type of motor (voltage class, 1000 V, 1200 V, or 1600 V)

• Drive carrier frequency

Figure 4.1 illustrates how to calculate motor lead lengths. The examples shown

assume a maximum lead length of 300 feet.

Figure 4.1 – How to Calculate Motor Lead Lengths

GV6000

Drive

Motor

150

′

150

′

250

′

200’

′

300

′

Motor

Motor Motor

Motor

GV6000

Drive

GV6000

Drive

GV6000

Drive