8 Introduction to the manual
Safety instructions
Only a qualified electrician who has appropriate knowledge on functional, machine and
process safety is allowed to install, start up and maintain the safety circuit.
WARNING!
This safety function does not disconnect the voltage of the main and
auxiliary circuits from the drive. Never work on the electrical parts of the drive or
the motor before you have also disconnected the drive system from the electric
supply, from rotating permanent magnet motors and from rotating motors equipped with
sine filters, and made sure by measuring that there is no dangerous voltage present.
WARNING!
After you have made additions to the drive safety circuit or modified it,
changed circuit boards inside the drive, replaced the FSO or FSE module or
modified FSO module parameters, always test the operation of the safety circuit
according to its acceptance test procedure. The change can affect unexpectedly. All
customer-made changes are on the customer’s responsibility.
WARNING!
The Safe torque off functionality is only achieved through the XSTO
connector of the inverter control unit. True Safe torque off functionality is not
achieved through the XSTO connectors of other control units (such as the supply
control unit or the brake control unit). In the supply and brake units, the XSTO input must
not be used for any safety function purposes to ensure personnel safety. The Safe torque
off function is supported by any ACS880 inverter or drive firmware. It is not supported by
supply or brake firmware.
WARNING!
(With permanent magnet or synchronous reluctance [SynRM] motors
only) In case of a multiple inverter IGBT failure, the inverter can produce an
alignment torque which maximally rotates the motor shaft by
180/
p
(with permanent magnet motors) or 180/2
p
(with synchronous reluctance [SynRM]
motors) degrees regardless of the activation of the Safe torque off function.
p
denotes the
number of pole pairs.
WARNING!
Read and obey all safety instructions in
ACS880 multidrive cabinets
and modules safety instructions
(3AUA0000102301 [English]). If you ignore them,
injury or death, or damage to the equipment can occur.
This manual does not repeat the complete safety instructions of the drive but it only
includes the instructions related to the scope of this manual.
Target audience
This manual is intended for people who install, start up, use and service the drive safety
option. Read the manual before working on the drive. You are expected to know the
fundamentals of electricity, wiring, electrical components, electrical schematic symbols,
and functional safety.
