Rockwell Automation SA3100 AC Power Modules - Manual (Page 104)

D-2 SA3100 Power Modules
Conduit
If metal conduit is used for cable distribution, observe the following guidelines:
• To minimize “cross talk” no more than three sets of motor leads should be routed
through a single conduit. If more than three Power Module/motor connections per
conduit are required, shielded cable must be used. Whenever practical, each
conduit should contain only one set of motor leads.
• Power Modules are normally mounted in a cabinet with ground connections made at
a common ground point within the cabinet. If the conduit is connected to the motor
junction box and grounded at the Power Module end, no further conduit grounds are
necessary.
Motor Lead Length
Installations with long motor cables may require the addition of output reactors or
cable terminators to limit voltage reflections at the motor. Refer to table D.1 for the
maximum length of cable allowed for various installation techniques.
!
ATTENTION: To avoid possible shock hazard caused by induced
voltages, unused wires in the conduit must be grounded at both ends.
If a drive sharing a conduit is being serviced or installed, all drives using
the same conduit should be disabled to eliminate shock hazard from
cross coupled motor leads.
Table D.1 – Maximum Recommended Motor Cable Lengths
Drive Rating
Termination
Type
Maximum Cable Length in
meters (feet) with 460V motor
& Insulation of..
1000V 1200V 1600V
Maximum Cable Length in
meters (feet) with 575V
motor & Insulation of..
1000V 1200V 1600V
0.75 kW (1 HP)
2.2 kW (3 HP)
5.5 - 22 kW (7.5 - 30 HP)
30 - 45 kW (40 - X60 HP)
45 - 112 kW (60 - X150 HP)
112 - 187 kW (150 - 250 HP)
187- 448 kW (X250 - 600 HP) None 12 (40) 33 (110) 121 (400)
7 (25) 12 (40) 121 (400)
7 (25) 15 (50) 121 (400)
7 (25) 12 (40) 73 (240)
12 (40) 42 (140) 121 (400)
12 (40) 121 (400) 182 (600)
Note 3 Note 3 Note 3
Note 3 Note 3 Note 3
Note 3 Note 3 Note 3
Note 3 Note 3 15 (50)
Not Recommended 12 (40)
Not Recommended 15 (50)
12 (40) 182 (600)
Note 3 Note 3 Note 3
5.5 - 22 kW (7.5 - 30 HP)
30 - 45 kW (40 - X60 HP)
45 - 112 kW (60 - X150 HP)
112 - 187 kW (150 - 250 HP)
187- 448 kW (X250 - 600 HP)
Reactor at Drive 1 76 (250) 182 (600) 182 (600)
91 (300) 182 (600) 182 (600)
60 (200) 182 (600) 182 (600)
182 (600) 182 (600) 182 (600)
Note 3 Note 3 Note 3
Not Available 182 (600)
91 (300) 121 (400) 182 (600)
60 (200) 91 (300) 182 (600)
182 (600) 182 (600) 182 (600)
Note 3 Note 3 Note 3
5.5 - 22kW (7.5 - 30HP)
30 - 45 kW (40 - X60 HP)
45 - 112 kW (60 - X150 HP)
112 - 187 kW (150 - 250 HP)
187- 448 kW (X250 - 600 HP) Reactor at Motor 2 182 (600) 182 (600) 182 (600)
182 (600) 182 (600) 182 (600)
152 (500) 182 (600) 182 (600)
152 (500) 182 (600) 182 (600)
Note 3 Note 3 Note 3
182 (600) 182 (600) 182 (600)
182 (600) 182 (600) 182 (600)
152 (500) 182 (600) 182 (600)
121 (400) 182 (600) 182 (600)
Note 3 Note 3 Note 3
5.5 - 448 kW (7.5 - 600 HP) Terminator at
Motor
3
182 (600) 182 (600) 182 (600) Not Recom. 182 (600) 182 (600)
1. A 3% reactor at the drive provides lower rise time and lower stress on the motor cable, but may produce a poorer waveform to the
motor. The reactor must have a turn-to-turn insulation rating of 2100V or higher for 460V motors and 2600V or higher for 575V motors.
2. A 3% reactor at the motor has less effect on 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 2100V or higher for 460V motors and 2600V or higher for 575V motors.
3. Product information not available at time of printing.