Publication 20A-IN009C-EN-P
PowerFlex® 70 Adjustable Frequency AC Drive Installation Instructions 11
Input Power Conditioning
Certain events on the power system supplying a drive can cause
component damage or shortened product life. These conditions are
divided into 2 basic categories:
1. All drives
– The power system has power factor correction capacitors
switched in and out of the system, either by the user or by the
power company.
– The power source has intermittent voltage spikes in excess of
6000 volts. These spikes could be caused by other equipment on
the line or by events such as lightning strikes.
– The power source has frequent interruptions.
2. 5 HP or Less Drives (in addition to “1
” above)
– The nearest supply transformer is larger than 100 kVA or the
available short circuit (fault) current is greater than 100,000 A.
– The impedance in front of the drive is less than 0.5%.
Step 3 Wire the Drive – Wire Recommendations
Type Wire Type(s) Description
Min. Insulation
Rating
Power
(1)(2)
Standard 600V, 90 °C (194 °F)
XHHW2/RHW-2
Anixter
B209500-B209507, Belden
29501-29507, or
equivalent
• Four tinned copper
conductors with XLPE
insulation.
• Copper braid/aluminum foil
combination shield and
tinned copper drain wire.
• PVC jacket.
Signal
(1) (3) (4)
Standard
Analog I/O
Belden 8760/9460(or
equiv.)
0.750 mm
2
(18AWG), twisted
pair, 100% shield with drain.
300V,
75…90 °C
(167…194 °F)
Belden 8770(or equiv.) 0.750 mm
2
(18AWG), 3
cond., shielded for remote pot
only.
Digital I/O
(1) (3) (4)
Shielded Multi-conductor shielded
cable such as Belden
8770(or equiv.)
0.750 mm
2
(18AWG), 3
conductor, shielded.
300V,
60 °C (140 °F)
(1) Control and signal wires should be separated from power wires by at least 0.3 meters (1 foot).
(2) The use of shielded wire for AC input power may not be necessary but is always recommended.
(3) If the wires are short and contained within a cabinet which has no sensitive circuits, the use of
shielded wire may not be necessary, but is always recommended.
(4) I/O terminals labeled “(–)” or “Common” are not referenced to earth ground and are designed to
greatly reduce common mode interference. Grounding these terminals can cause signal noise.
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