19
The 3-position terminal block is located in the right hand corner of the power supply/communication
board.
Figure 3.4 DC Power Connections
Wiring guidelines for using 24 Vdc power
supply:
Equipment Grounding
3.6.3
A safety ground should be attached to terminal block TB1 (on both ac and dc input power models) to
maintain electrical safety in the event of a fault condition. Follow the terminal block wiring instructions
in section 3.6. Keep the required tightening torque in mind (section 3.5).
The external ground connection is not provided for the attachment of the protective conductor (the
safety ground). Rather, it is provided only as a supplemental bonding connection where local
authorities permit or require such a connection: for example, as a means of equipotentiality. The wire
connection is on the bottom right exterior surface. The following wire sizes may be used: 10 AWG
(5.26 mm
2
) or 11 AWG (4.17 mm
2
).
Do not connect the power supply dc common to earth ground.
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