GE Digital Energy L30, Instruction Manual, Page: 84 / 644

3-26 L30 Line Current Differential System GE Multilin
3.3 PILOT CHANNEL COMMUNICATIONS 3 HARDWARE
3
The current differential function must be “Enabled” for the communications module to properly operate.
Refer to
SETTINGS

GROUPED ELEMENTS

LINE DIFFERENTIAL

CURRENT DIFFERENTIAL
menu.
The fiber optic modules (7A to 7W) are designed for back-to-back connections of UR-series relays only. For
connections to higher-order systems, use the 72 to 77 modules or the 2A and 2B modules.
OBSERVING ANY FIBER TRANSMITTER OUTPUT MAY CAUSE INJURY TO THE EYE.
3.3.2 FIBER: LED AND ELED TRANSMITTERS
The following figure shows the configuration for the 7A, 7B, 7C, 7H, 7I, and 7J fiber-only modules.
Figure 3–27: LED AND ELED FIBER MODULES
3.3.3 FIBER-LASER TRANSMITTERS
The following figure shows the configuration for the 72, 73, 7D, and 7K fiber-laser module.
Figure 3–28: LASER FIBER MODULES
When using a laser Interface, attenuators can be necessary to ensure that you do not exceed the
maximum optical input power to the receiver.
NOTE
NOTE