Siemens SG8158-00 manual Communications, Cradle Assembly

Installation

2

2.5 Communications

The ISGS relay must be connected to a host computer in order for it to communicate with other devices. The relay supports both RS-232 and RS-485 (optional) data inter- faces. The use of either of these data interfaces will allow the same level of access to the system as the front panel key- pad, but configuration through communications does not require a password.

The next section describes the connection to the interfaces. For more information about operating the ISGS relay via the data interfaces, refer to the documentation for the communi- cations software, such as WinPM™ or Wisdom. Keypad operations are described in Chapter 3.

2.5.1PC Communications (RS-232)

The RS-232 interface (front port) is intended only for short- term connections to a portable computer. Use this interface to perform initial setup or to read the ISGS relay data logs or waveform buffers using an appropriate software program. To connect your PC to the front port, follow these instructions:

1.Remove the relay case front cover.

2.Locate the RS-232 connector on the front panel of the cradle assembly.

3.Connect the PC to the front panel RS-232 port using a standard DB-9 serial port connection cable (DB-9 male to DB-9 female or DB-25 female depending on the type of port on the computer). This connection does not require the use of special adapters or a null-modem cable.

2.5.2Network Communications (RS-485)

The optional RS-485 interface (rear port) allows remote com- munication over a shielded twisted pair wire at distances of up to 4000 feet. Use this interface together with an appropri- ate software program for remote monitoring and control of the ISGS relay.

To connect the ISGS relay to your communications system, follow these instructions:

1.Locate the RS-485 connector on the rear of the M1 case.

2.Use shielded twisted pair wire to connect pins 48, 49, and 50 to your electrical distribution system.

To connect the ISGS relay to your PC via the rear port

•directly, use an RS-232 to RS-485 converter.

•via modem, use an RS-232 to RS-485 converter and a null modem.

2.6 Cradle Assembly

Some of the setup and maintenance procedures in this man- ual require removal of the relay cradle assembly from the drawout case. Use the following instructions for the proper removal and insertion of the cradle assembly.

IMPORTANT:

The relay module contains CMOS circuits. Electro- static discharges into or around the relay cradle or any of its components must be avoided. Use grounding straps or touch a grounded metal sur- face before handling the relay cradle.

2.6.1Removing

Use the following procedure to remove the cradle assembly from the case:

1.Remove the relay case front cover.

2.Remove the top and bottom connecting plugs (paddles).

3.Loosen the cradle assembly by pulling the top release lever to the left and the bottom release lever to the right until the assembly ejects from the case.

4.Grasp the cradle assembly by the edges of the front panel and pull it out of the drawout case.

5.Place the cradle assembly on an anti-electrostatic sur- face and perform the desired work.

2.6.2Inserting

Use the following procedure to insert the cradle assembly into the drawout case:

1.Insert the cradle assembly until the release levers come in contact with the protrusions on the case.

2.Position the top and bottom release levers until the slots on the levers align with the protrusions on the case.

3.Use the release levers to finish inserting the cradle assembly into the case. Apply pressure to the cradle assembly front panel until the assembly fully seats in the case.

4.Insert the top and bottom paddles.

5.Check for proper insertion of the cradle assembly by seeing if the expected measured values are observed on the relay display.

6.Install the front cover.

8 Siemens Energy & Automation, Inc.