GE N60 Instruction Manual page 70
Network stability and
synchrophasor measurement system
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- Instruction manual (666 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (644 pages)
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DIRECT INPUT AND OUTPUT COMMUNICATIONS
The UR-series C37.94 communication module can be connected to the electrical interface (G.703, RS422, or X.21) of a non-
compliant digital multiplexer via an optical-to-electrical interface converter that supports the IEEE C37.94 standard. The
following figure shows the concept.
The UR-series C37.94 communication module has six switches to set the clock configuration. The following figure shows
3
the functions of these control switches.
For the internal timing mode, the system clock is generated internally. Therefore, set the timing switch selection to internal
timing for relay 1 and loop timed for relay 2. There must be only one timing source configured.
For the looped timing mode, the system clock is derived from the received line signal. Therefore, set the timing selection to
loop timing mode for connections to higher order systems.
The IEEE C37.94 communications module cover removal procedure is as follows:
1.
With power to the relay off, remove the IEEE C37.94 module (type 2G, 2H, 2I, 2J, 76, or 77 module) as follows. Record
the original location of the module to help ensure that the same or replacement module is inserted into the correct
slot.
2.
Simultaneously pull the ejector/inserter clips located at the top and bottom of each module in order to release the
module for removal.
3.
Remove the module cover screw.
4.
Remove the top cover by sliding it towards the rear and then lift it upwards.
5.
Set the timing selection switches (channels 1 and 2) to the required timing modes (see description earlier).
6.
Replace the top cover and the cover screw.
7.
Re-insert the IEEE C37.94 module. Take care to ensure that the correct module type is inserted into the correct slot
position. The ejector/inserter clips located at the top and at the bottom of each module must be in the disengaged
position as the module is inserted smoothly into the slot. Once the clips have cleared the raised edge of the chassis,
engage the clips simultaneously. When the clips have locked into position, the module is inserted fully.
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Figure 3-39: Switches
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION
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