10 Introduction to the manual
In addition to this manual,
• for ACS880 single drives, see the drive hardware manual
• for ACS880 air-cooled multidrives, see Safety instructions for ACS880 multidrive
cabinets and modules (3AUA0000102301 [English]).
The function described in this manual activates the Safe torque off (STO) function of the
drive/inverter unit. The STO function of the ACS880 drives is certified (SIL 3 according to
EN/IEC 61800-5-2 and IEC 61508). For a detailed description of the STO function, see the
hardware manual of your drive/inverter unit.
WARNING! The functions described in this manual do 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! The STO function of ACS880 drives cannot prevent the intermediate
DC current from flowing through, and heating up, the motor in case a short-circuit
occurs in the output stage of the drive. The supplier must take this into account
when planning the protection of the installation.
Note: When you connect the temperature sensor(s) of the Ex motor to the drive STO
terminals through a relay, ensure the availability of required reinforced (double) insulation
between the main circuit (motor) and the control unit. For example, the insulation of the
temperature sensor in the Ex motor and the insulation of the protection relay affect the
insulation of the whole circuit. All Ex motors manufactured by ABB have basic insulation
between the main circuit and the temperature sensor. Similarly, ABB protection relays
have basic insulation between the sensor circuit and relay output. This ensures double
insulation for the ATEX-certified motor thermal protection function between the main circuit
and the drive control unit.
Example circuit diagrams of this manual
The purpose of the example circuit diagrams is to help in understanding the operation of
the ATEX-certified motor thermal protection functions. The diagrams do not cover all
possible details and variants of the drives. The component designations do not necessarily
match each drive.
WARNING! Never connect, test or measure a drive based on the diagrams of this
manual. Each delivery is unique. Before you start the work on the electric circuits
of a drive, always refer to the delivery-specific circuit diagrams.
00 ACS880 ATEX cabinet.book Page 10 Tuesday, May 28, 2019 10:25 AM
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