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Instruction Leaflet
30-470 (E)
Page 5
Type LRO Robonic Automatic Transfer Switch
Rated 30 amperes through 100 amperes at 600 volts Ac maximum 50
or 60 Hertz.
The mechanism is a lever operated device controlled by a 120 volt
unidirectional motor.
The transfer motor drives a nylon cam which in turn operates a steel
lever by sliding a pin along a slot in the back of the lever. The lever, in
turn, operates the two breaker handles. The distance travelled is
determined by two projections on the cam. These projections operate
two micro switches (NLS, ELS) which in turn disconnect the power to
the transfer motor causing a brake to operate.
The type LRO has three operating positions. They are the normal
breaker closed and the emergency breaker open, the emergency
breaker closed and the normal breaker open or both the normal and
emergency breakers open but never both normal and emergency
breakers closed.
The type LRO can also be easily manually operated. Open the lever
cover, remove the slide pin and place it in the hole supplied in the lever
cover and close the cover. Then the lever can be manually operated
for what ever position desired without interference by the automatic
control. For automatic control again, simply align the lever slot with the
hole in the operating cam and replace the slide pin.
The various automatic control components are described under the
section titled Automatic Control.
Automated Control Component Identification
1. NE ON Delay Relay Assuring emergency source will remain
2. ES OFF Delay Relay Overriding momentary dips or outages
3. EC ON Delay Relay Running standby unloaded to cool
4. EN ON Delay Relay Assuring normal source will remain
5. CR Control relay Voltage and frequency sensitive
6. VS Voltage sensing relays Sensing normal source
7. Terminal block connection
Operating Arm
Pivot Post
Emergency Normal
Projection To
Operate Limit
Switches
Cam
Slide
Pin