Frame Ground. Symmetricom TimeSource 500

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Frame Ground. Symmetricom TimeSource 500 | Manualzz

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Frame Ground

Frame ground connections are made on power terminal blocks

TB1 and TB2. Refer to Figure 26 for the location of the terminals on the rear of the shelf, and refer to Figure 28 for the terminal connections.

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Figure 28. Battery Connections

RTN

A

–48V

A

–48V

B

RTN

B

TB1

A. TB1 Connections

(Office Battery A)

TB2

B. TB2 Connections

(Office Battery B)

3

Remove the protective covers from the terminal blocks.

Ensure the frame ground wires are long enough to reach from the shelf rear panel to the frame ground connection. Use one 16 AWG

(1.47 mm) green insulated wire to connect the terminal of power terminal block TB1 to the frame ground, and use another

16 AWG (1.47 mm) green insulated wire to connect the terminal of TB2 to frame ground.

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TimeSource 3500

Installation

097-72050-01 Issue 7: August 2003

111

3

S S S S S S S S S S S S S S S S S S S S S S S S S S S S S

Make the ground connection, following one of the methods described below, depending on whether a ground rod is installed:

With ground rod

Solder the frame ground connection to the 6 AWG (4.115 mm) frame ground rod run vertically on each side of the rack. Two methods are acceptable:

• Crimp an appropriate-size spade lug (user-supplied) to the

16 AWG (1.47 mm) wire, bend the lug around the 6 AWG

(4.115 mm) rod, and solder.

• Strip enough insulation from the 16 AWG (1.47 mm) wire to permit three complete turns around the 6 AWG (4.115 mm) rod, and solder.

Note:

When soldering, use a 25 watt soldering iron to ensure the

6 AWG (4.115 mm) rod is heated sufficiently to prevent a cold solder connection.

If the power is not to be connected immediately, replace the protective covers on the terminal blocks.

Without ground rod

Crimp the supplied spade lug to the 16 AWG (1.47 mm) wire, and screw the lug to a screw hole on the rack. Remove the paint and sand the area around the screw hole to ensure proper conductivity. Coat the connection with an electrically conductive antioxidant compound, for example, Kopr-Shield spray.

Crimp the supplied spade lug to the other end of the 16 AWG (1.47 mm) wire, and connect it to the terminals on TB1 and TB2

(Figure 28).

If the power is not to be connected immediately, replace the protective covers on the terminal blocks.

112

TimeSource 3500

Installation

097-72050-01 Issue 7: August 2003

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