Eaton Electrical QSNAP user manual Power Source, Power Requirements, Current Source, Load

Intelligent Technologies (IT.) QSNAP

February 2002

Power Source

The IT. QSNAP is designed for use with 24V DC power. The QSNAP uses power from two sources when operating properly; these sources are the QCPort subnet and the Eaton’s Cutler-Hammer Intelligent Technologies (IT.) Electromechanical Starter. This allows the QSNAP to detect and communicate to the user that the IT. starter does not have 24V DC power, signaling a fault or an E-Stop.

The main power that powers the communication is from QCPort, as illustrated in Table 5. Some power is required from the starter for communication to be present between the Intelligent Technologies (IT.) Electromechanical Starter and the QSNAP.

The power for the IT. starter must be connected to the starter terminal.

Table 5: Power Requirements

Current Source

QCPort

IT. Starter

Load

TBD

TBD

When a power supply is chosen for QCPort, take into account the load on QCPort. When a power supply is chosen for the starter(s), size it for the load of the starter(s) using the IT. Contactor and Starter User Manual (Publication No. 49400). Refer to the IT. QCPort System Install and Planning Guide (Publication No. MN05001002E) for more information on how to size the power supply for the QCPort system.

The power for the Eaton’s Cutler-Hammer Intelligent Technologies (IT.) Electromechanical Starter must be connected to the Intelligent Technologies (IT.) Electromechanical Starter terminal, as illustrated in Figure 3.

To Starter

+

24V DC

–

Optional

E-Stop

To QSNAP

Figure 3: Starter Interface Connection

6 Pub. No. MN05001001E