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Gardner Denver Guidelines for proper wiring, grounding and feed power conditioning -
This
compressor package is provided with variable speed drives (VFD
’s) to control compressors and cooling
fan motors. The indicated Gardner Denver guidelines for proper wiring, grounding, and feed power
conditioning must be followed in order to protect the VFD electronics. Failure to do so will void your
warranty.
Electrical Wire Sizing
– A certified electrician familiar with National Electric Codes and applicable local
codes shall size the electrical power wires serving the compressor package. Refer to Figure 2-3,
for a
summary of maximum package current consumption values.
460 VOLT VST110A VST150A and VST180A MINIMUM COPPER SUPPLY WIRE
RECOMMENDATIONS
Minimum
75ºC wire
Minimum
90ºC wire
NOTES
Model
Input
Package
Amps
NEC Package
Copper Wire
Copper Wire
Voltage
(Estimated)
Amps at
30ºC
Sized at 40ºC
Sized at 40ºC
VST 110
460
239.23
297.33
500 or 4/0 (2)
350 or 3/0 (2)
Single set of 500kcm or two parallel sets of
4/0AWG conductors in a single conduit.
VST 150
460
325.23
404.83
350 (2)
250 (2)
Two parallel sets of conductors in single
conduit.
VST 180
460
365.23
454.83
400 (2)
300 (2)
Two parallel sets of conductors in single
conduit.
The NEC requires that wire sizes be determined by using the appropriate multiplier for the conductor temperature rating at
ambient temperatures other than 30ºC and then selecting the wire that has sufficient ampacity, after correction, to meet the
load requirements shown in the "NEC Package Amps @ 30ºC" column above. Wire ampacity is to be corrected, not "Package
Amps”. Additional correction multipliers apply based on more than three conductors in one conduit. The appropriate
installation and use of 75ºC and 90ºC wire is the responsibility of the electrical professional(s) performing the installation and
must be per NEC, local and state regulations as allowed. All of the above recommended minimum wire sizes are based on all
terminal connections being rated at 75ºC minimum temperature rating and copper wire run lengths of 100 feet or less. Please
note that all UL-508A listed control panels are rated for 40ºC ambient conditions.
Figure 2-3 – PACKAGE MAXIMUM CURRENT CONSUMPTION SUMMARY
