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, 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).
6.
The FSO module generates an STO indication (parameter FSOGEN.61).
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.
8. After the motor temperature has decreased to normal, the Pt100 relays reset
automatically.
32 ATEX-certified motor thermal protection function with Pt100 relays (+L514+Q971)
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