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Implementing a motor thermal protection circuit 15
Two-channel connection to drive STO terminals
General
This section describes an implementation of the ATEX-compliant motor thermal protection
circuit. The circuit uses the ATEX-certified Safe disconnection function (Q971) of
the drive and a two-channel (redundant) connection to the drive STO terminals.
Resetting the safety function
A manual reset is mandatory in the temperature protection function, if it is required for
ensuring the compliance of the system with Ex/ATEX regulations. When the protection
relay detects motor overtemperature, the drive must not restart before a manual reset
command. You can implement a manual reset in the ATEX-compliant protection relay
(recommended).
In this example, it is also possible to use the STO indication in the drive to implement the
manual reset (see section
Reset method and status indications
on page
).
Indications of the safety function
In this example, you can use the drive STO indication to indicate the motor
overtemperature. See section
Reset method and status indications
on page
.
Note
: Make sure that this indication generates a fault if the protection relay does not
contain a manual reset.
Summary of Contents for ACS880 Series
Page 4: ......
Page 12: ...12 Introduction...
Page 32: ...32 Parameter settings...
Page 37: ...Technical data 37 ATEX certificate...
Page 38: ...38 Technical data...
Page 39: ...Technical data 39...
Page 42: ...42 Technical data...
Page 44: ...www abb com drives www abb com drivespartners 3AUA0000132231 Rev D EN 2018 06 13 Contact us...