ABB ACS 501 Installation & Start-Up Manual page 5

Safety Instructions
Warnings, Cautions,
and Notes
iv
WARNING! Your drive contains dangerous voltages when connected to the
line power. Always check that the ACS 501 is safe, after disconnecting the
power, by measuring the DC bus voltage and line input voltage. Failure to
check voltages could cause death or serious injury. Only a qualified electrician
should carry out the electrical installation.
Note that the Motor Control Card of the ACS 501 is at DC bus voltage
potential.
The DC bus capacitors contain dangerous DC voltage levels (1.35 x V
After disconnecting the supply, wait at least five minutes after the display
readout on the control panel has disappeared before taking any measurements.
Dangerous external control voltages may be present on the relay outputs of
the Control Interface Card and Option Cards.
CAUTION: Electrostatic Discharge (ESD) can damage electronic circuits.
Do not handle any components without following the proper ESD
precautions.
ACS 501 Installation & Start-up Manual
).
IN