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ELECTRICAL INSTALLATION
IRIG-B
GPS CONNECTION
OPTIONAL
IRIG-B
TIME CODE
GENERATOR
(DC SHIFT OR
AMPLITUDE MODULATED
SIGNAL CAN BE USED)
2–34
The uncovered communications cable shield connected to the common terminal should
not exceed 1" (2.5 cm) for proper EMC shielding of the communications cable.
IRIG-B is a standard time code format that allows time stamping of events to be
synchronized among connected devices within 1 millisecond. The IRIG time code formats
are serial, width-modulated codes which can be either DC level shift or amplitude
modulated (AM) form. The type of form is auto-detected by the 339 relay. Third party
equipment is available for generating the IRIG-B signal; this equipment may use a GPS
satellite system to obtain the time reference so that devices at different geographic
locations can also be synchronized.
The uncovered communications cable shield connected to the common terminal should
not exceed 1" (2.5 cm) for proper EMC shielding of the communications cable.
Figure 2-37: IRIG-B connection
GPS SATELLITE SYSTEM
RG58/59 COAXIAL CABLE
+
–
GE MULTILIN
3 SERIES RELAY
F1
IRIG-B(+)
F2
IRIG-B(-)
TO OTHER DEVICES
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
RECEIVER
898741A3.CDR
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