GE Digital Energy 735, Instruction Manual

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CHAPTER 3: SETUP AND OPERATION
735/737 FEEDER PROTECTION RELAY – INSTRUCTION MANUAL 3–11
3.4 Switches
3.4.1 Communication [11]
Switches are used to set the communication parameters. Move the switch to the right for a
1 or ON. To use the communications capability of the 735/737, a unique address must be
chosen and the baud rate must match the system selected. Available baud rates of 1200,
2400, 9600, and 19200 are selected using switches 1 and 2 as follows: (ON = switch to
right).
Chapter 4: COMMUNICATIONS describes the required data frame and message structure.
Up to 31 relays (slaves) can be connected on a twisted pair communications link to a single
master. Each relay must have a unique address from 1 to 31 or address conflicts will occur.
Address 0 is reserved for broadcast mode and should not be used.
To select a given address, set switches 3 to 7 so the indicated numbers add up to the
correct address. For example, address 14 = 2 (4 on) + 4 (5 on) + 8 (6 on), with remaining
switches 3 (=0) and 7 (=0) off. When switch 8 "TEST" is on, the 735/737 will accept
communication commands to simulate different dial settings with computer controlled
phase and ground currents for testing and training purposes. Protection is disabled in the
test position once simulation commands are received from the communication port. Set
this switch OFF to disable simulation during normal operation.
3.4.2 Option Switches [14]
The option switches are selected according to the following table:
SWITCH 2 SWITCH 1 BAUD RATE
OFF OFF 1200 baud
OFF ON 2400 baud
ON OFF 9600 baud
ON ON 19200 baud
Table 3–1: Option Switches
SWITCHES FUNCTION
1 2 3 4 5 6 7 8
PHASE TIME OVERCURRENT SHIFT
OFF OFF --- --- --- --- --- --- phase time overcurrent shift x 1.0
ON OFF --- --- --- --- --- --- phase time overcurrent shift x 0.5
OFF ON --- --- --- --- --- --- phase time overcurrent shift x 0.8
ON ON --- --- --- --- --- --- phase time overcurrent shift x 1.1