Siemens ISOLATED MULTI-DROP SG-6048-01 - Manual (Page 11)

4
Testing ACCESS Devices
8 Siemens Energy & Automation, Inc.
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.
4.1 Prepare 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.
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.
BLK
WHT
+ -
4.2 Testing 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.
Figure 4.2 Test Connection for Static Trip III
in Type RL Circuit Breaker
Two-wire cable
RS-485 cable
+/- 15 VDC
Data (+)
Data (-)
BLK
WHT
rear panel
front panel
15VDC
OUT
+ -
RS485
+
_
+ _
RS485 RS485 RS485 RS485
+ _ + _ + _
Isolated Multi-Drop
Terminal block for
cubicle disconnect
on inside-left panel of
Type RL circuit breaker
compartment