ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971) 33
With an FSO module
1. When the motor temperature rises, the sensor resistance increases linearly.
2. When the motor temperature exceeds the set operating temperature limit of the Pt100
relay(s), the relay indicates motor overtemperature through its output contacts.
3. The opening contacts of the extension relay(s) [-A81] ([-A82] and [-A83]) switch off the
voltage to terminal X113:4 of the FSO module (this is configured as the input of the
STO [or SS1] function in the FSO module).
4. The FSO module opens the STO circuit of the drive either immediately (STO function)
or after a deceleration ramp (SS1 function). This prevents the drive from generating
the torque required to rotate the motor.
5. The drive generates an STO indication (parameter 31.22, see page 44).
6. The FSO module generates an STO indication (parameter FSOGEN.61, see
page 47).
7. If the extension relay(s) [-A81] ([-A82] and [-A83]) are wired to a digital input, the loss
of the signal triggers a motor temperature fault in the drive (see page 44).
8. After the motor temperature has decreased to normal, the Pt100 relays reset
automatically.
9. The user must reset the faults either from the reset source defined by the user
(parameter 31.11, see page 45) or locally with the drive control panel:
• the STO fault in the drive (if configured with drive parameter 31.22, see page 44)
• the motor overtemperature fault in the drive (if configured, see page 44).
10. Optional
: The user must reset the safety function in the FSO module with the reset
button (if a reset circuit is wired and configured, see page 46 and the next section)
00 ACS880 ATEX cabinet.book Page 33 Tuesday, May 28, 2019 10:25 AM
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