Instruction Leaflet 30-470 (E)
Page 12
Trouble Shooting Guide |
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Symptoms |
| Possible Causes |
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• refusal to |
| • a voltage sensing relay did not |
source upon restoration |
| energize |
|
| • emergency to normal time delay |
|
| relay has failed |
|
| • a loose control connection |
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• will not transfer to emergency |
| • |
source upon failure of normal |
| • generator not producing |
source |
| |
| enough voltage at a high | |
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| |
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| enough frequency (device CR |
|
| is voltage and frequency |
|
| sensitive) |
|
| • a loose control connection |
|
| • CR device has failed |
|
| • normal to emergency time delay |
|
| relay, if supplied, has failed |
|
| • if voltage sensing relays |
|
| supplied in emergency, there |
|
| may be a failure of one |
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|
• transfer without a power |
| • a voltage sensing relay has |
failure in the normal source |
| failed |
|
| • emergency to normal time delay |
|
| relay has failed |
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• no time delay when there |
| • that particular time delay relay |
should be |
| has failed |
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|
• |
| • the engine start time delay relay |
the normal source has not |
| has failed |
failed |
| • a plant exerciser has been built |
|
| |
|
| into the system |
|
| • a voltage sensing relay has |
|
| failed |
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• normal source has failed and |
| • the operating cam in the |
the transfer switch cycles |
| mechanism has either broken |
without stopping in emergency |
| or come out of the breaker |
|
| handle |
|
| • ELS has failed to operate |
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• if the power is not available on |
| • the breaker may be complete |
the load terminals with either |
| with trip units and if there has |
the normal or emergency |
| been a fault on the system, the |
sources available and the |
| motor circuit has been opened |
transfer switch will not operate |
| by either EAS and NAS. |
|
| Correct and manually reset the |
|
| breakers in the transfer switch |
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Recommended Maintenance
1.DO NOT perform dielectric tests on the equipment with the control components in the circuit.
2.DO NOT use loctite.
3.Check lubricant in high speed bearings of the motor and the low speed bearings of the gear box. For lubrication use Dow Corning Silicon DC44 or equivalent on the high speed bearings and Aero Shell No. 6 grease or equivalent in gear box after 5000 operations.
4.Check if control components are tight in sockets.
5.Periodically inspect all terminals (load, line and control) for tightness. Retighten all bolts, nuts and accessible hardware. Clean or replace any contact surfaces which are dirty, corroded or pitted.
6.Robonics should be in clean, dry and moderately warm locations. If signs of moisture are present, dry and clean transfer switch. If there is corrosion try to clean off, if cleaning is unsuitable replace the corroded parts. Should dust and/or debris gather on the transfer switch, brush, vacuum or wipe clean. DO NOT blow dirt into breaker or terminals.
7.Test the transfer switch operation. While the Robonic is exercising, check for freedom of movement, hidden dirt or corrosion and any excessive wear on the mechanical operating parts. Clean, lubricate or replace parts where necessary.
8.Check all adjustable control components (time delay and voltage sensing relays) for correct settings.
9.If the type “RO” mechanism is removed be sure that the scribe lines on the gears are in line. When reassembling the drive mechanisms be sure that they are fastened to the correct holes in the frame and that the breaker handles are between the cam fingers (one breaker has to be on and the other off).
Type LRO Robonics
CAUTION
DO NOT overtighten the pivot screw inside the operating arm. This screw was correctly adjusted at the factory to provide low friction movement of the operating arm without excessive play.
DO NOT overtighten the set screw holding the operating cam on the motor shaft.