3 Installation3.4 Electrical Installation86 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com3.4.5 Control section power supplyThe control section in the DS7 soft starter can be powered with the followingvoltages using terminals +U s/-U s (sizes 2, 3, and 4) or +U s/-A2 (size 1):• 24 V DC/AC at DS7-340…• 120 - 230 V AC at DS7-342…• 24 V DC at DS7-34D…DS7-34D…-D soft starters can be powered directly through theSmartWire-DT ribbon cable.3.4.6 Internal device voltagesThe DS7 soft starters do not provide any internal voltage.3.4.7 Ground control voltageAll control signal terminals of the DS7 soft starter are galvanically isolatedfrom the power section. Connecting the control voltage on the DS7 softstarter to earth is not necessary.￫ At a high load on the PSU supplying the SWD (many modules,signaling lamps, soft starters) soft starter DS7 can also besupplied with control voltage through control signal terminals Usor further SmartWire-DT PSUs (gateway EU5C-SWD-PF…).If power is fed through control signal terminals Us the 24 Vconnection on the SWD gateway must be switched off.￫ Ensure that the regulator supply voltage and the control signalsalways have the same potential and are supplied from the samevoltage source.NOTICEIn size 1 devices, connection terminals +Us, +A1, and 13(via the TOR contact) have a common reference potential (-A2).The switched voltage (TOR) and the control voltages (+U s , +A1)must be the same here!￫ If control voltage earthing requirements must be complied with(e.g., Safety of machinery - Electrical equipment of machines,EN 60204) earthing must be implemented at the power supplysource (control transformer, power supply unit).
