Document v6YVDbjzD2bny6L169vDGk8kb

Motors and Controllers GENERAL ELECTRIC COMPANY SCHENECTADY, N. Y. Sales Offices in Principal Cities Motor Drive and Control For Heating, Ventilating and Air Conditioning Systems Methods of Drive Fig. I Pig. 1. Silent chain drive can frequently be employed to advantage, with a lowering of the motor cost as compared with direct-connected drive. The illustration shows a 26 hp., 600/900 r.p.m., Type CD, adjustable speed, motor driving an American Blower Pan at the Port land (Oregon) Journal Building. The chain drive is enclosed in an oil-tight housing. Pig. i Pig. t. " Texrope" drive makes pos sible the placing of the motor very close to the fan pulley, and saves space. The illustration shows a 60 hp., 860 r.p.m. motor driving a Buffalo fan. The maximum fan speed is 140 r.p.m. Pig. 4. With fans of moderate size driven by alternating-current' motors, the simple belt drive is efficient and economical. This illustration shows a Type KT. 3 hp., 860 r.p.m., con stant speed motor controlled by a CR7006 magnetic switch, operating a Buffalo fan in the Plaut Store, Newark, N. J. Pig. 8 Pig. 3. The directconnected, slow- Pig. 6. The center distances on a belt drive can be shortened by using the " Lenix" idler to insure a larger arc of contact at the motor pulley. The illustration shows a tO hp.. Type MT, slip-ring indxtdion motor driving a fan at the Washington High School, New Rochelle, N. Y. speed direct-current motor has long been a standard drivefor ventilating and ex haust fans in large buildings. It is quiet and compact in operation, and has the lowest pos sible mainterumce for a long period of years. The illus tration shows a Type CD, 16 hp., slow-speed, adjust able speed motor driving an Ameri can Blower fan at Pig. 4 the Detroit Matonic Temple. Fig. 6 This Company will gladly assist in the solution of any electrical problem in relation to heating and ventilation 710 General Electric Company Motors and Controllers Motor Drive and Control For Heating, Ventilating and Air Conditioning Systems Controllers for Use with Varying Speed, 3- or 2-phase, Alternating-Current. Slip-Ring Motors for Driving Fans Remote Indicating Control Four Speeds--CR7761-FI Remote indicating control, four speeds, operated by remotely located push-button station with bull'a- eye lights of different colors indicating speed selected or attained. 5-50 hp. Pig. 1.--CR7761-PI, 80-60 Hp. HP. Dimensions in Inches (Approx.) Height Width Depth Doors Open 90* Net Weight . in Ld. (Approx.) s- m 10-15 20 25 30 40 50 67y, 671/; *67v5 671/2 *671/, 67'/< 671/5 351/2 351/2 351/2 351/5 391/5 39'A 39'/5 49'/, 49'/, 49'/, 49'/, 53'/, 53'/, 53'/, 580 600 870 870 1050 1130 1200 All sizes mounted on 64-in. angle supports. Equipment includes one CR7761-F1 control panel, one BS-15-F four-speed indicating station, one BS-31-A start-safe-run station and one CR1924, 3-pole, fused switch. Dimensions of BS-15-F are 8Hn.by 15Jtfin. Sizes 5-15 hp. have self-contained resistors. Larger sizes have separate resistors. CR7761-F1 enclosed contactor panel includes four speed-controlling or accelerating contactors with three relays. Remote located push-button station BS-15-F has four speed buttons marked (i) Slow Speed. (2) Second Speed, (3) Third Speed, (4) Full Speed, and one "stop" button. On pressing any "speed" button the motor accelerates automatically to that speed and the corresponding bull eye is illuminated. Speed can be changed while running to any other value by pressing button corresponding to speed desired. An'additional control sta- BS-31-A with three buttons, "start," "safe," and "run," may be provided adjacent to the motor to start the equipment at the motor for test purposes. When the "safe" button is pushed the equipment Pig. 2.--BS-16-P .is not only stopped but cannot be started from the remote indicating station. The "run" button on the BS-31-A station . adjacent to the motor is pressed to release the "safe." When started by the BS-31-A station ad jacent to the motor, the motor can be run at slow speed only. If it is desired to arrange this controller so that the motor can only be started in the fan room, add a CR7002 and a BS-79-J Start-Stop . Station. With this arrangement the BS-31-A station will not be required. Speed control and stopping may be secured from the remote station as before. Use with these Controllers Type MTB Quiet Operating Slip Ring Motors Pig. 3 Installation of 3 BS-15-P, Remote Indicating Control Stations ' for.CR776l-Pl Controllers operaline Exhaust Pans in the Pent House of the Salaam Temple, Newark. At right is shown a Type MT Motor belted to Supply Pan and Controlled by a CR7764 Controller Pig. 4 Installation of Type MT Motor bdted to Exhaust Pan at Salaam Temtde, Newark. Motor i eon-' trolled by a CR77G1-PJ Remote Indicating Control Panel operated from a Remote Point by one of the Control Stations shown in Pig. 2 This Company will gladly assist in the solution of any electrical problem in relation to heating and ventilation 711