Siemens SG-6048-01 manual Testing Access Devices, Prepare Cable

4 Testing ACCESS Devices

4 Testing ACCESS Devices

You can use the Isolated Multi-Drop converter’s 15 VDC power output to provide DC power for testing Static Trip III trip units or SAMMS devices. According to the steps in this section, first prepare a cable for connecting the devices to the converter. Then follow the appropriate procedure for the specific device(s) you want to connect to the converter.

4.1Prepare Cable

To prepare the cable, follow these steps while referring to Figure 4.1.

1.Select a two-conductor cable of sufficient length to reach between the converter and the device(s) you want to connect.

2.Strip the insulation from both wires at both ends of the cable, exposing approximately 0.5 inch of metal wire on each.

3.Loosen the screws in the two-terminal connector that comes with the converter. Insert one wire into each slot on the connector, making sure to take note of polarity.

+	-
BLK
WHT

Figure 4.1 Two-Terminal Connector for Test Connection

Use this cable to connect devices to the converter according to the procedures in the remainder of this section.

4.2Testing Static Trip III in Type RL Circuit Breaker

If you are testing a Static Trip III trip unit in a Type RL circuit breaker, follow these steps to connect the trip unit to the converter for 15 VDC power, while referring to Figure 4.2:

1.Plug the connector of the two-conductor cable into the 15 VDC output port.

2.Making sure to observe the polarity of the cable, connect the other end to terminals 2 and 3 on the terminal block for cubicle disconnect. (This terminal block is located on the inside left panel of the Type RL circuit breaker compartment.)

3.Connect an RS-485 cable between the terminal block in the circuit breaker and the converter. (You may need to prepare a length of communications cable as described in section 3.1 above.) Plug the cable’s three- terminal connector into an RS-485 port on the front of the converter. Connect the black wire from the other end of the cable to Data(+) (terminal 4) on the terminal block, and connect the white wire to Data(-) (terminal 5) on the terminal block.

4.Plug one end of the converter’s power cord into the 120 VAC connection on the converter, and plug the other end into any 120 VAC grounded power source.

5.Turn the power switch on.

6.Using testing software supplied by Siemens, verify that the attached trip unit communicates properly.

Isolated Multi-Drop

rear panel

15VDC

+ -

Two-wire cable

		OUT				+/- 15 VDC
					BLK	Data	(+)
				RS-485 cable
					WHT	Data	(-)
	RS485
	+	_			Terminal block		for
					cubicle	disconnect
					on inside-left panel of
					Type RL	circuit breaker
RS485		RS485	RS485	RS485	compartment
+ _		+ _	+ _	+ _ front panel

Figure 4.2 Test Connection for Static Trip III in Type RL Circuit Breaker

8 Siemens Energy & Automation, Inc.