connection. In this case, the FSO module controls the drive STO
function.
• Cabinet-built drives: In the option +L537+Q971+Q973/Q972
(+L521), terminal block [X68] is located between the module and
the FSO module (not shown in the figure). See the circuit
diagrams delivered with the drive for the actual wiring.
Wiring example 3 (page 45): An external safety relay is connected
between the FPTC-02 module and the drive STO inputs with a
two-channel connection.
Wiring example 4 (page 46): The STO outputs of the FPTC-02 module
are connected directly to the STO terminals of the drive with a
one-channel connection.
Wiring example 5 (page 47): The STO outputs of the FPTC-02 module
are connected to an FSO module, and the STO outputs of the FSO
module to the STO terminals of the drive with a one-channel
connection.
If you use a one-channel connection, make sure that you can reach
the required safety integrity level (SIL).
If you do not use the XFLT input (Fault), connect a resistor
(100 ohm … 1 kohm 1/4 W wire-wound) in the XFLT input instead of
a PTC sensor.
If you do not use the XWRN input (Warning), disable the motor
temperature warning with a parameter setting.
Note: Only the XFLT input of the FPTC module is shown in the
examples. The XWRN input is not safety-related and does not activate
the drive STO function.
42 Electrical installation
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