Siemens Simovert Masterdrives Compact Plus Series Operating Instructions Manual page 191

Connecting-up
X100 - external
DC24 V supply,
USS bus
33
34
35
36
NOTICE
7-12
The 4-pole terminal strip serves to connect the external 24 V DC power
supply (supply from the supply unit or an AC/AC converter) and for
connecting a USS bus.
The USS bus connection is linked to the control electronics and the
9-pole Sub-D socket of the serial interface X103.
The bus terminating resistor can be switched in via switch S1 as
required. In the lower position, the bus termination is switched off.
The termination has to be switched in whenever the unit is located at
one end of the USS bus.
Terminal Designation
33 +24 V (in)
34 0 V
35 RS485P (USS)
36 RS485N (USS)
Connectable cross-section: 2.5 mm² (AWG 12)
Terminal 33 is at the top when installed.
Table 7-6 External 24 V supply, USS bus
The unit draws a current of 1 A from the 24 V power supply. When
optional boards are plugged in, this increases to a maximum of 1.6 A.
The RS485 interface can be operated either via –X100 or –X103.
Significance
24 V DC power supply
Reference potential
USS bus connection
USS bus connection
6SE7087-6KP50
Operating Instructions SIMOVERT MASTERDRIVES
06.2006
Range
DC 20-30 V
0 V
RS485
RS485
Siemens AG