Chapter 3 – Installation Instructions
3-8
ACS 501 Installation & Start-up Manual
Output Power Wiring
Install the motor wiring away from other wire routes. Avoid long parallel runs
with other wires. If motor wires must run parallel to the control wires for a
short length, the length must not exceed those outlined in Table 3-7. These
maximum lengths also apply to control wires from other systems. Table 3-7
shows the maximum lengths for running control wires parallel to motor wires.
Table 3-7
Maximum Lengths For Parallel Wiring
The rapid rate of voltage changes causes capacitive coupling between motor
wiring and the grounded metallic conduit. This capacitive coupling increases
with switching frequency and motor wire length. This phenomenon can cause
substantially higher measured current (by the drive) than is actually seen by
the motor. This may result in:
•
Nuisance overcurrent trips.
•
Erroneous current display readings. The current display will read higher
than measured current.
•
Nuisance activation of current limits or electronic motor overload function
(I
2
t).
If the motor wire lengths in Table 3-8 must be exceeded, chokes should be
installed in the drive output. Contact ABB for more information.
Table 3-8
Maximum Recommended Motor Wire Lengths
Distance Between Wires
Maximum Run Length
ft
m
ft
m
0
0
≤3.28
≤
1
.328
0.1
≤
32.8
≤
10
3.28
1
≤
328.0
≤
100
Switching Frequency, kHz
Maximum Cable Length
Feet
Meters
1
200
61
3
175
53.3
12
100
30.5
