17
Field Conversion
For field conversions contact your local Ingersoll
Rand distributor or air center to ensure that the motor
and controls are appropriate and to determine the proper
speed range of your compressor. Conversion to an SG
Controller may be required in some applications to avoid
operation problems. Check with your Ingersoll Rand
representative.
The Ingersoll Rand 302 Series VFD option can be
supplied as a factory option or as a field conversion kit for
an existing compressor. The field kit includes the
additional pressure transducer, terminals, and three
relays required to convert to Ingersoll Rand 302 Series
VFD operation. On Sierra machines, this kit also includes
an additional electric-driven oil pump and all of its
mounting and piping to provide constant oil pressure for
the inlet valve's hydraulic cylinder. The factory option has
all of the necessary components already installed into the
compressor with the exception of the drive and pressure
transducer.
For a field installation of an existing compressor, the
additional components for the VFD must be installed. The
terminals, relays, and manual motor starter (for Sierra
only) must be installed into the starter panel box per the
assembly drawing. The electric-driven oil pump and its
components (for Sierra only) must be installed per the
assembly drawing specified.
See Compressor Schematics in the VSD
Interconnect Guide
. Prime the Sierra oil pump by filling suction hose
with oil BEFORE applying power to compressor. Once
filled with oil, quickly start and stop compressor until
pump and associated hose are free of vibrations.
The compressor should not be started and
stopped in this manner more than 3 times. Pump seals
may fail if pump runs dry. Once primed, there should be
no need to prime pump again unless compressor has sat
idle for extended time.
If Sierra oil pump was not installed at factory,
check for proper pump rotation. Ensure pump rotates
counter-clockwise while viewing pump from behind
motor.
Starter to Ingersoll Rand 302 Series VFD
Conversion
If the Ingersoll Rand 302 Series VFD is wired as shown
in the schematics in the Wiring Schematics Section of
this manual, a simple procedure is followed to convert the
compressor from operation with the compressor’s
conventional starter to operation with the Ingersoll Rand
302 Series VFD and vice versa.
Changes required for conversion from a conventional
starter to the Ingersoll Rand 302 Series VFD are
described in the following:
1. Disconnect all power from the Ingersoll Rand
302 Series VFD and compressor.
2. Wait at least 15 minutes for power to dissipate
from the Ingersoll Rand 302 Series VFD’s
capacitors.
3. Move the motor leads from the starter contactor
terminal lugs to the tie-off block mounted in the
bottom of the starter box (where the Ingersoll
Rand 302 Series VFD leads come into the
compressor starter box). For air cooled units,
the fan motor leads must also be moved. The
lugs on the bottom of the 1M, 2M, and 1S
contactors may have to be removed to meet the
terminal clearance requirements of some local
electrical codes.
4. Wire the normally-open contact of the Ingersoll
Rand 302 Series VFD alarm relay (3CR) into the
control power wiring as shown in the Wiring
Schematics Section of this manual. Make sure
relays (1CR and 2CR) are properly wired as
shown on the appropriate wiring schematic.
See Compressor Schematics in the VSD
Interconnect Guide
5. Restore power to the machine and Ingersoll
Rand 302 Series VFD .
Ingersoll Rand 302 Series VFD to Starter
Conversion
For conversion back to the starter from the Ingersoll
Rand 302 Series VFD, reconnect the motor leads to the
motor contactors and remove the Ingersoll Rand 302
Series VFD alarm relay (3CR)
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