Operation principle and hardware description 37
Connectors X50…X53
The cabinet builder must arrange an auxiliary voltage of 230 V AC (or 115 V AC with
option +G304) to connector X50 to power the electronics of the supply module. It is
recommended for the cabinet builder to arrange an auxiliary voltage of 230 V AC (or
115 V AC with option +G304) to connector X50 to power the electronics of the inverter
module. This 230 V AC / 115 V AC auxiliary voltage powers up the internal power supply
board (BDPS), which then powers up the other internal circuit boards of the module with
24 V DC voltage even if the DC voltage of the intermediate circuit is low (the BDPS is
powered internally from the DC link). The 24 V DC voltage is available on X53 and it can
be used to power the BCU control unit. It is not allowed to use the 24 V DC output on
terminal X53 for any other purpose than for powering up the BCU control unit.
If a direct-on-line fan (option +C188) is used, the user must connect the fan supply
(400 V AC 50 Hz or 60 Hz for D8T and R8i modules; 230 V AC for D7T modules) to the
module control connector [X50.1]. If an internal heating element (option +C183 for D8T
and R8i modules) is used, the user must connect the supply for the heating element to the
module control connector [X50.7].
If the Safe torque off (STO) function is used, STO OUT on the BCU control unit is wired to
X52 (STO IN). X52 is wired to X51 (STO OUT) on the R8i inverter module internally; see
chapter The Safe torque off function (page 351). X51 on the R8i inverter module forwards
the STO signals to the X52 connector of the next module (if present).
If the Safe torque off function is not used, the “24V” inputs on X52 must be connected to
+24 V (X53, for example) on each inverter module. X51 is to be left unconnected.
Note: As a factory standard, Safe torque off is disabled by a jumper connection between
connectors X52 and X53.
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