Standard Motor Catalog

Section TR Technical Reference Guide

SHAFT SLINGER A steel reinforced neoprene shaft slinger is an elastomer ring disc mounted on the shaft. It reduces the probability of the contamination of the bearing system when the shaft is rotating. (Not available on explosion proof). Shaft slinger is standard on drive end for all Severe Duty motors and on both ends on XSD Ultra ® motors (except C-face and D-flange, for 140-180 frames). Shaft Grounding Ring (SGR) The shaft grounding ring prevents electrical bearing damage by safely channeling harmful shaft voltages away from the bearings to ground. The specially engineered conductive micro fiber of the AEGIS grounding ring used in GE motors provides a path of least resistance for damaging bearing currents and extends motor bearing life. The shaft grounding ring is offered as an externally mounted option on the Energy Saver ® ODP and TEFC motor products, and DC products, using a specially designed mounting bracket. The shaft grounding ring is offered as an internal mount option on XSD Ultra ® motors and ASD motors.

For mounting a tether tachometer, the motor is supplied with opposite drive end shaft extension and a hole drilled and tapped in the fan cover/endshield to secure the anti-rotation device. Customer is to provide; ‘detailed shaft dimensions’, ‘manufacturer’ and ‘type’ of the tachometer device. NOTE: Tachs available through mod-shop, see Section MM. VERTICAL JACK SCREWS Vertical jack screws are used during alignment of the motor and drive equipment. The jack screw is used as an aid to insert the proper shims. Vertical jack screws are NOT intended as permanent support of the motor. Proper shimming and bolting of the motor to the base must be completed and tension removed from the jack screws. VIBRATION DETECTION Motors can be provided with vibration switch or vibration detection probes/transmitters or with only provisions for vibration probes. VIBRATION SWITCH Provided with SPDT switch which disconnects the motor power circuit when the motor vibration level exceeds the set vibration limit. VIBRATION PROBES/TRANSMITTERS This transmits electrical signal (mA) proportional to velocity or displacement, directly to PLC or DCS or any other vibration monitor. These are generally mounted on the endshields, above the bearings. When it is not feasible to mount on the endshields, they can be mounted on the frame, close to the endshields.

Figure 31

TACHOMETER Tachometer and encoder are terms used for equipment that has an output signal indicating the motors speed. The degree of sophistication is diverse - ranging from a DC voltage proportional to speed, to dual output frequency pulses, up to a few thousand pulses per revolution (PPR). It can be used to indicate not only velocity, but also acceleration and position when used in association with equipment to interpret the signals. TACHOMETER OR ENCODER MOUNTING PROVISION For mounting a C-face tachometer, the motor is supplied with an 8.5” C-face mounting rabbet on the opposite drive end with a stub shaft. Customer is to provide; the ‘stub shaft dimensions’, ‘manufacturer’ and ‘style’ of device to be mounted, with order.

TR.37

Data subject to change without notice. 02/23 • www.gemotorswolong.com