Sullair SUPERVISOR CONTROLLER Series, Instruction Manual

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Section 6
VARIABLE SPEED DRIVE
6.1 SAFETY
The following special instructions apply to VSD
packages provided with electronic adjustable speed
motor drives. These are in addition to other warn-
ings and cautions.
6.2 OVERVIEW
The Sullair VSD drive application is custom
designed for operation of air compressors. All nec-
essary control functions are performed through the
Supervisor keypad. The drive functions as a mod-
ule on the Supervisor communications bus.
Relevant drive status data and compressor per-
formance are presented on the Supervisor display.
Its keypad provides simple setup and adjustment of
necessary drive parameters. Drive controls are
coordinated with internal compressor controls, and
with other Supervisor compressors in sequenced
systems. The Supervisor monitors drive perform-
ance to provide motor thermal and other protections
in an easy-to-use, robust design.
Ground the unit following the instructions in this
manual. Ungrounded units may cause electric
shock and/or fire. The variable speed drive drive
has a large capacitive leakage current during
operation, which can cause enclosure parts to be
above ground potential. Proper grounding, as
described in this manual, is required. Failure to
observe this precaution could result in death or
severe injury.
Before applying power to the variable speed
drive, make sure that the front and cable covers
are closed and fastened to prevent exposure to
potential electrical fault conditions. Failure to
observe this precaution could result in death or
severe injury.
Refer all drive service to trained technicians.
This equipment should be installed, adjusted,
and serviced by qualified electrical maintenance
personnel familiar with the construction and
operation of this type of equipment and the haz-
ards involved and in accordance with published
service manuals. Failure to observe this precau-
tion could result in death or severe injury.
Line terminals (L1, L2, L3), motor terminals (U, V,
W) and the DClink/brake resistor terminals (-/+)
are live when the drive is connected to power,
even if the motor is not running. Contact with
this voltage is extremely dangerous and may
cause death or severe injury.
Before opening the variable speed drive covers:
• Disconnect all power to the variable speed
drive.
• Wait a minimum of 5 (five) minutes after all the
lights on the keypad are off. This allows time
for the DC bus capacitors to discharge.
• A hazard voltage may still remain in the DC bus
capacitors even if the power has been turned
off. Confirm that the capacitors have fully dis-
charged by measuring their voltage using a
multimeter set to measure DC voltage. Failure
to follow the above precautions may cause
death or severe injury.
Do not perform any meggar or voltage with-
stand tests on any part of the variable speed
drive or its components. Improper testing may
result in damage. Prior to any tests or meas-
urements of the motor or the motor cable, dis-
connect the motor cable at the variable speed
drive output terminals (U, V, W) to avoid dam-
aging the variable speed drive during motor or
cable testing.
Do not touch any components on the circuit
boards. Static voltage discharge may damage
the components.
Install the variable speed drive in a well-ventilat-
ed room that is not subject to temperature
extremes, high humidity, or condensation, and
avoid locations that are directly exposed to sun-
light, or have high concentrations of dust, cor-
rosive gas, explosive gas, inflammable gas,
grinding fluid mist, etc. Improper installation
may result in a fire hazard.
Make sure that no power correction capacitors
are connected to the variable speed drive output
or the motor terminals to prevent variable speed
drive malfunction and potential damage.
Make sure that the variable speed drive output
terminals (U, V, W) are not connected to the util-
ity line power as severe damage to the variable
speed drive may occur.