Commissioning; Testing; Channel Testing - GE L30 Instruction Manual

L30 Line Current Differential System
Chapter 9: Commissioning

Commissioning

9.1 Testing

9.1.1 Channel testing

The communications system transmits and receives data between two or three terminals for the 87L function. The system
is designed to work with multiple channel options, including direct and multiplexed optical fiber, G.703, and RS422. The
speed is 64 Kbaud in a transparent synchronous mode with automatic synchronous character detection and CRC
insertion.
The Local Loopback Channel Test verifies the L30 communication modules are working properly. The Remote Loopback
Channel Test verifies the communication link between the relays meets requirements (BER less than 10–4). All tests are
verified by using the internal channel monitoring and the monitoring in the Channel Tests. All of the tests presented in this
section must be either OK or PASSED.
1. Verify that a type "W" module is placed in slot 'W' in both relays (for example W7J).
2. Interconnect the two relays using the proper media (for example, single-mode fiber cable) observing correct
connection of receiving (Rx) and transmitting (Tx) communications paths and turn power on to both relays.
3. Verify that the Order Code in both relays is correct.
4. Cycle power off/on in both relays.
5. Verify and record that both relays indicate In Service on the front display.
6. Make the following setting change in both relays:
ELEMENTS  CURRENT DIFFERENTIAL  CURRENT DIFF FUNCTION
7. Verify and record that both relays have established communications with the following status checks:
ACTUAL VALUES  STATUS  CHANNEL TESTS  CHANNEL 1 STATUS
ACTUAL VALUES  STATUS  CHANNEL TESTS  CHANNEL 2 STATUS
8. Make the following setting change in both relays:
9. Make the following setting change in both relays:
TESTING  CHANNEL TESTS  LOCAL LOOPBACK TEST  LOCAL LOOPBACK CHANNEL NUMBER
10. Initiate the Local Loopback Channel Tests by making the following setting change:
TESTING  CHANNEL TESTS  LOCAL LOOPBACK TEST  LOCAL LOOPBACK FUNCTION
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS  GROUP 1  CURRENT DIFFERENTIAL
: "Enabled."
: "OK"
: "OK" (If used)
: "Enabled."
TESTING  TEST MODE
: "1"
: "Yes"
9-1