Installation Instructions

GEI M1010-A

3. For direct coupled applications use flexible couplings if possible.

Accurate mechanical lineup is essential for successful operation. Mechanical vibration and roughness in

running the motor may be an indication of poor alignment. In general, lineup by straight edge across,

and feeler gauges between coupling halves is not sufficiently accurate. It is recommended that the

lineup be checked with a dial indictor and checking bars connected to the motor and load-machine

shafts. The space between coupling hubs should be maintained as recommended by the coupling

manufacturer. Shaft offset should not exceed 0.002”. Angular misalignment should be less than 0.002”.

4. The application of pulleys, sheaves, sprockets, and gears on the motor’s shaft is shown in NEMA Standard

MG1-14.07. The application of the V-belts dimensions for alternating current motors is in MG1-14.42. V-

belt sheave pitch diameters should not be less than the values shown in Table 14-1 of NEMA MG-1.

Sheave ratios greater than 5:1 and center-to-center distances less than the diameter of the large sheave

should be referred to the Company. Make certain that the minimum allowed diameter of the motor

pulley and the maximum belt tension are not exceed because an excessive pull may cause bearing

trouble and shaft failures. Tighten belts only enough to prevent slippage. Belt speeds should not exceed

5000 feet per minute (25 meters per second). When V-belts are used, sheave ratios greater than 5:1 and

center-to-center distances less than the large sheave shall not be used. The dimensions of the belt pulley

are to be determined according to the kind of belt, transmission and capacity to be transmitted. Vent

holes have to be kept free and required minimum distances are to be observed in order not to obstruct

the flow of cooling air. In addition, make sure that the discharged hot air is not re-circulated into the

motor.

C. Power Supply and Connections

1. Nameplate voltage and frequency should agree with the power supply. Motors will operate satisfactorily

on line voltage within ±10% of the nameplate value or frequency within ±5%, combined variation not to

exceed ±10%.

2. Dual voltage motors can be connected for the desired voltage using instructions on the nameplate or the

connection diagram.

3. Wiring of motor, control, overload protection and grounding should meet the National and Local codes.

4. When mounting conditions permit, the conduit box may be rotated so that the conduit entrance can be

made upward, downward, or from either side. For oversize conduit boxes, the mounting height of the

motor may have to be increased for accessibility.

WARNING: Motor and control overload protection and grounding should be in accordance with

the USA -National Electric Code’ or ‘BS/EN 60204-1’ and/or ‘BS/EN 60204-11’ and consistent with

sound local practices.

IV. OPERATION

A. Steps Prior to Starting

WARNING: If the motor has been in a damp location, dry it out thoroughly before operating.

Before energizing the motor for the first time or after an extended shut down, it is advisable to

check the insulation resistance, power supply and mechanical freedom of the motor.

In accordance with established standards, the recommended minimum insulation resistance for the stator winding

when measured with a 500 volt DC direct indicating ohmmeter with self-contained power supply (megger), shall not

be less than 5 mega-ohms at 40°C for a motor rated under 1000 volts, and not less than 100 mega-ohms at 40°C for

a motor rated over 1000 volts. If the insulation resistance is lower than this value, it is advisable to eliminate the

moisture in one of the following ways.