Westinghouse Canada Electronics, Control and Distribution Products Division Instruction Leaflet 30-471 (E) Page 1 September, 1984 New Information Robonic II Automatic Transfer Switches Operation and Maintenance Manual Index AUTOMATIC TRANSFER SWITCH Warranty ......................................... 2 Westinghouse Offices ..................... 3 General Description ........................ 4 Component Identification ................ 7 LRO Description ............................. 5 RO Description ....
Instruction Leaflet 30-471 (E) Page 2 Warranty The company warrants the apparatus to be supplied hereunder to be of the kind designated or specified. The company shall repair or replace any defective part or parts, f.o.b. the company’s factory, repair shop or warehouse, which prove to be defective under normal and proper use within one year from the date of shipment, provided that the purchaser gives the Company immediate written notice of any such defect or defects.
Instruction Leaflet 30-471 (E) Page 3 For Supply Westinghouse industrial products, and a complete line of electrical construction products, are distributed across Canada by WESCO (Westinghouse Sales & Distribution Company). For product application, delivery or pricing information, call the WESCO office nearest you. WESCO Sales Office St.
Instruction Leaflet 30-471 (E) Page 4 General Description Mechanical Component Identification CSA Standard C22.2 No. 178-1978 defines an automatic transfer switch as, “self acting equipment for transferring one or more load conductor connections from one power source to another.” The same Standard also gives definitions for type A and type B automatic transfer switches. “Transfer” switch type A means an automatic transfer switch that does not employ integral overcurrent devices.
Instruction Leaflet 30-471 (E) Page 5 Solid State Logic Control Panel Type LRO Robonic II 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. Emergency Normal 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.
Instruction Leaflet 30-471 (E) Page 6 Type “RO” Robonic II Automatic Transfer Switch Type “PRO” Robonic II Automatic Transfer Switch A complete line rated from 150 amperes through 1000 amperes at 600 volts Ac or at 250 volts Dc. Rated 1200 amperes through 3000 amperes at 600 volts Ac or 250 volts Dc. The transfer mechanism consists of the transfer motor, a gear train and two breaker operating cams. The transfer mechanism consists of a transfer motor, a gear train and two breaker operating cams.
Instruction Leaflet 30-471 (E) Page 7 Table 1 — Interrupting, Closing and Withstand Rating — Robonic Type A Table 3 — Maximum Upstream Circuit Protective Devices for Type A Robonics, 90% or Larger Motor Load Robonic Continuous Rating Robonic Maximum Upstream Type 600 Vac 30 to 100 amps 150 to 225 amps 300 to 1000 amps 1200 to 3000 amps LRO RO RO PRO 14,000 22,000 22,000 65,000 Type Continuous Rating (amps) Breaker Frame Size LRO 30, 70, 100 EB, EHB, FB, HFB, FB-P LA-P c/w 400LAP10 300 100 R
Instruction Leaflet 30-471 (E) Page 8 Both under and overfrequency cards are factory calibrated at 60 Hz. The actual values of pickup and dropout are as follows: Relay Driver S#1266C77G02 Type Dial Setting Hz Pickup Hz Dropout Hz Underfrequency Underfrequency Overfrequency Overfrequency 60 50 60 50 57 47 63 53 55 45 65 55 Option#1A, 1B, 1C, 3A, 3B, 3C, 4A, 4B, 4C, 4D This card is used in place of any of the timing modules when instantaneous operation is required.
Instruction Leaflet 30-471 (E) Page 9 Adjustments Timer and frequency modules can be adjusted as per module front plate. Voltage sensing modules can be adjusted as follows: The relay is incorporated in the control scheme to stop the transfer switch with both breakers open. This is to allow residual load voltage to decay prior to closing on another supply which could be out of phase. When the timing cycle is complete, the relay re-initiates transfer to the available source.
Instruction Leaflet 30-471 (E) Page 10 This time delay relay is an octual plug-in, sychronous motor type. It is complete with clutch and mechanical load switch giving one instantaneously operated normally open contact and a timed single pole double throw contact in a dust-tight grey capsule. The mechanism is constructed to operate for the time set on the indicating dial and then disconnect itself when the timing cycle is complete.
Instruction Leaflet 30-471 (E) Page 11 or 2. It may be used to start an engine-generator set at selected intervals, at least once per week, but without causing the transfer switch to operate and transfer the load to the generator supply. At the end of the interval it will cause the engine-generator to shutdown. INSTRUCTIONS — TO OPERATE THE ENGINE FOR AN INTERVAL ONCE EACH WEEK, WITH OR WITHOUT OPERATION OF THE TRANSFER SWITCH. 1.
Instruction Leaflet 30-471 (E) Page 12 Schematic of Robonic II Transfer Switch Consider the Robonic II in the normal operating position, with normal power available and the normal interrupter closed. The following are energized: U.V. (undervoltage module), TDES (time delay engine start), and NR (normal relay). The U.V. monitoring all 3 phases of the normal power, senses a dip or loss of voltage which instantly causes NR to deenergize. Contacts NR2 and NR4 open, and contacts NR1 and NR3 close.
Instruction Leaflet 30-471 (E) Page 13 Replacing Parts Parts List The Robonic Automatic Transfer Switch has been designed to have all components accessible and readily removable from the front of the panels. The Robonic Transfer Switch is divided into two basic sections. The upper section consists of the main contacts and transfer mechanism, the lower section consisting of all the automatic control devices.
Instruction Leaflet 30-471 (E) Page 14 Trouble Shooting Guide Recommended Maintenance Symptoms Possible Causes • refusal to re-transfer to normal source upon restoration • a voltage sensing relay did not energize • emergency to normal time delay relay has failed • a loose control connection • will not transfer to emergency source upon failure of normal source • engine-generator did not start • generator not producing enough voltage at a high enough frequency 1.
