Implementing a motor thermal protection circuit 13
2
Implementing a motor thermal
protection circuit
Contents of this chapter
This chapter contains instructions on implementing an ATEX-compliant motor thermal
protection circuit using the ATEX-certified Safe disconnection function (Q971) of
the ACS880 drive/inverter module.
Overview
You can implement the motor thermal protection circuit with or without an FSO safety
functions module.
The FSO safety functions module (FSO-12 or FSO-21) is an optional device used with the
ACS880 drives to implement safety functions. When installed, it reserves the standard
STO connection of the drive. In this case, the FSO module activates the STO function of
the drive (that is, opens the drive STO circuit) either immediately or after a deceleration
ramp.
Note
: You cannot connect the temperature sensor directly to the FSO module. You must
use an ATEX-compliant protection relay in between.
Without an FSO module: The opening contacts of the protection relay(s) open the STO
circuit of the drive (see sections
Two-channel connection to drive STO terminals
on
page
and
One-channel connection to drive STO terminals
on page
With an FSO module: The opening contacts of the protection relay(s) activate the STO or
Safe stop 1 (SS1) function of the FSO module and the FSO module opens the STO circuit
of the drive (see section
One-channel or two-channel connection to an FSO module
page
).
Содержание ACS880 Series
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