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
Summary of Contents for 735
Page 6: ...TOC IV 735 737 FEEDER PROTECTION RELAY INSTRUCTION MANUAL ...
Page 56: ...3 24 735 737 FEEDER PROTECTION RELAY INSTRUCTION MANUAL CHAPTER 3 SETUP AND OPERATION ...
Page 78: ...4 22 735 737 FEEDER PROTECTION RELAY INSTRUCTION MANUAL CHAPTER 4 MODBUS COMMUNICATIONS ...
Page 120: ...5 42 735 737 FEEDER PROTECTION RELAY INSTRUCTION MANUAL CHAPTER 5 OVERCURRENT CURVES ...
Page 130: ...6 10 735 737 FEEDER PROTECTION RELAY INSTRUCTION MANUAL CHAPTER 6 TESTING ...