Rockwell Automation 1302 575v AC Drive - Canada Only - Manual (Page 24)

3–6 1302 Preinstallation
Publication 1302-5.0 — January, 1998
Recommended Motor Lead Lengths
The following motor lead lengths are recommended to reduce line
disturbances and noise. See Figure 3.3.
•
For applications using one motor, motor lead length should not
exceed 76 meters (250 feet).
•
For applications with multiple motors, total motor lead length should
not exceed 76 meters (250 feet).
When total lead length exceeds 76 meters (250 feet), nuisance trips can
occur, caused by capacitive current flow to ground. 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 line reactors or other
steps must be taken to correct the problem. See Table 3.E. Note that
the motor lead lengths shown in Table 3.E are only guidelines. Your
application may be restricted to a shorter motor lead length due to:
•
The type of wire
•
The placement of the wire (for example, in conduit or a cable tray)
•
The type of line reactor (For example, with or without LC filters)
•
The type of motor
Figure 3.3
How to Measure Motor Lead Lengths
1302 Drive
Motor
38m (125') 38m (125')
15m (50')
61m (200')
61m (200')
8m (25') 8m (25')
76m (250')
Motor
Motor
Motor
Motor Motor
Motor
1302 Drive 1302 Drive 1302 Drive
All examples represent 76m (250') of motor lead length.