Westinghouse 30-471 (E) Trouble Shooting Guide Symptoms Possible Causes, Recommended Maintenance

Instruction Leaflet

30-471 (E)

Page 14

Trouble Shooting Guide
Symptoms	Possible Causes
• refusal to re-transfer to normal	• a voltage sensing relay did not
source upon restoration	energize
	• emergency to normal time delay
	relay has failed
	• a loose control connection
• will not transfer to emergency	• engine-generator did not start
source upon failure of normal	• generator not producing enough
source
	voltage at a high enough
	frequency
	• a loose control connection
	• normal to emergency time
	delay, if supplied, has failed
	• if voltage sensing modules
	supplied in emergency, there
	may be a failure of one
• transfer without a power failure	• a voltage sensing module has
in the normal source	failed
	• emergency to normal time delay
	has failed
• no time delay when there	• that particular time delay has
should be	failed
• engine-generator starts when	• the engine start time delay has
the normal source has not	failed
failed	• a plant exerciser has been built
	into the system
	• a voltage sensing module has
	failed
• 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
• if the power is not available on	• the breakers 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

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).

Note: When servicing logic control, or transformer module, disable the motor circuit

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.