16 Implementing a Safe disconnection function
Thermal motor protection with two-channel connection
General
This section represents the implementation of an ATEX-compliant thermal motor
protection circuit:
• The circuit uses the ATEX-certified Safe disconnection function of the drive.
• There is an ATEX certified thermistor motor protection relay to monitor the motor
temperature.
• There is a two-channel connection from the temperature protection relay to the drive
STO terminals. The STO inputs of the drive are connected to their respective output
contacts of the protection relay.
Note: The STO function of the drive must always have redundant connection. See
Connection diagram (two-channel connection) on page 17.
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