1: Safety
SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
02250247-571 R04
11
Subject to EAR, ECCN EAR99 and related export control restrictions.
1.12 Safety warnings
The following special instructions apply to VSD packages
provided with electronic adjustable speed motor drives.
These cautions that apply to VSD operation.
WARNING
Ground the unit following the instructions in this
manual. Ungrounded units may cause electric
shock and/or fire. The variable speed drive has a
large capacitive leakage current during opera-
tion, 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.
WARNING
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.
WARNING
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.
WARNING
Line terminals (L1, L2, L3), motor terminals (U,
V, W) and the DC link/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.
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.Wait a min-
imum of 15 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 discharged 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, V, W) 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.
