ST18 & ST22 (U.S.A. & Mexico) Operation & Maintenance Manual 1: Safety
88291013-137 R05
Subject to EAR, ECCN EAR99 and related export control restrictions. 7
WARNING
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.
CAUTION
Do not perform any megger or voltage withstand
tests on any part of the variable speed drive or
its components. Improper testing may result in
damage. Prior to any tests or measurements of
the motor or the motor cable, disconnect the
motor cable at the variable speed drive output
terminals (U, VW) to avoid damaging the vari-
able speed drive during motor or cable testing.
CAUTION
Do not touch any components on the circuit
boards. Static voltage discharge may damage
the components.
CAUTION
Install the variable speed drive in a well venti-
lated 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, corro-
sive gas, explosive gas, inflammable gas,
grinding fluid mist, etc. Improper installation may
result in a fire hazard.
CAUTION
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.
CAUTION
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 VSD may
occur.
NOTE
Interior electrical wiring is performed at the fac-
tory. Required customer wiring is minimal, but
should be done by a qualified electrician in com-
pliance with OSHA, National Electrical Code,
and/or any other applicable State, Federal, and
local electrical codes concerning isolation
switches, fused disconnects, etc. Sullair pro-
vides a wiring diagram for use by the installer.
NOTE
Customer must provide electrical supply power
disconnect within sight of machine.
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