ABB ACS880 Series, Application Manual

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8 Introduction
This guide does not repeat the complete safety instructions of the drive but it only includes
the instructions related to the scope of this guide. The general instructions are given in this
section and the option-specific instructions in the appropriate chapter.
In addition to this guide,
•
for ACS880 single drives, see the hardware manual
•
for ACS880 air-cooled multidrive modules and single drive modules, see Safety
instructions for ACS880 multidrive cabinets and modules (3AUA0000102301
[English])
•
for ACS880 liquid-cooled multidrive modules and single drive modules, see Safety
instructions for ACS880 liquid cooled multidrive cabinets and modules
(3AXD50000048633 [English]).
The safety function described in this guide activates the Safe torque off (STO) function of
the drive/inverter module. 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 module
.
WARNING! The functions described in this guide 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.
The ATEX-certified Safe disconnection function
When the drive/inverter module is equipped with the Q971, its Safe torque off
(STO) function is certified as a Safe disconnection function. It can be used as a protective
system to protect equipment in potentially explosive atmospheres. The certificate is an EU
Type examination certificate in accordance with the ATEX Product Directive 2014/34/EU.