Installation, Operation and Maintenance Instructions for AC Induction Motors 56- 6800 Frames (NEMA) 63 – 280 Frames (IEC) MARATHON ELECTRIC Contact Motor Customer Service at: Phone: (715) 675-3311 www.marathonelectric.
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE OWNER: READ AND SAVE THESE INSTRUCTIONS SAFETY INSTRUCTIONS This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. WARNING Before installing, using, or servicing this product, carefully read and fully understand the instructions including all warnings, cautions, & safety notice statements.
4.1.1 Ventilation 4.2.3 Lubrication Interval 4.1.2 Insulation 4.2.4 Lubrication Procedure 4.1.3 Electrical Connections 4.2.5 Lubrication Example 4.2 Lubrication and Bearings 4.3 Trouble Shooting 4.2.1 Grease Type 4.3.1 General Trouble-Shooting Warnings 4.2.2 Bearing Operating Temperature 4.3.
2.3.1 BEARING LUBRICATION: Bearings are grease packed at the factory; relubrication upon receipt of motor or while in storage is not necessary. If stored more than one year, add grease per lubrication instructions (Table 4-4) before start-up. 2.3.2 SHAFT ROTATION: It is recommended that the motor shaft be rotated 5 to 10 rotations every three months to distribute the grease in the bearings. This will reduce the chance for corrosion to form on the bearing rolling elements and raceways.
mounting a rigid base (footed) motor vertically is the responsibility of the installer. VERTICAL SHAFT DOWN: Most standard horizontal motors thru 449 Fr. (excluding brake motors) can be mounted in a vertical shaft down orientation. For vertical brake motors see section 3.3.6.2. VERTICAL SHAFT UP: WARNING: HAZARDOUS LOCATIONS VERTICAL MOUNT: Hazardous locations motors must NOT be mounted vertically shaft up without approval by the motor manufacturer.
Figure 1 3.3.4.4 Belt Tension CAUTION: Equipment Failure Caution Belt tensioning by feel is NOT acceptable. Tensioning by "feel" can be very misleading, and can damage motor and equipment. It is normal for V-belts to squeal initially when line starting a motor. In general, belt tensions should be kept as loose as possible while still transmitting the required torque without slipping. Belt tensions must be measured with a belt tension gage.
Table 3-3 Motor Hp Recommended Min Sheave Dia (in) Minimum 1200 rpm Max # Belt of Type Belts 3VX 1 3VX 1 3VX 2 3VX 3 3VX 2 3VX 3 3VX 4 3VX 4 3VX 5 3VX 6 3VX 7 3VX 7 5VX 4 5VX 4 5VX 5 5VX 5 5VX 6 5V 7 5V 7 5V 8 8V 6 8V 7 8V 7 8V 8 8V 8 8V 9 Sheave Avg. Deflected Force (lbs) 3.4 4.0 3.1 2.8 3.3 4.0 4.7 5.4 5.4 6.0 5.6 5.9 11.6 14.6 14.1 14.5 16.0 14.1 15.4 16.0 27.6 27.1 30.3 29.1 31.6 30.
to Table 3-5 values. Definite purpose VFD motors may accommodate longer cable lengths. For additional information contact motor manufacturer. Table 3-5 Max Cable Lengths General Purpose Motors These values are based on 3 kHz carrier frequency. Add suitable VFD output-side filters when exceeding the listed values. Frame Size 230V 460 V 575 V NEMA 56-320 600 ft. 125 ft. 40 ft. NEMA 360-5011 1000 ft. 225 ft. 60 ft. IEC 80-200 180 m. 40 m. 12 m. IEC 225-280. 300 m. 70 m. 18 m.
3.4 ELECTRICAL CONNECTIONS: WARNING: ELECTRICAL HAZARDS Before proceeding read Section 1-1 on Electrical Safety. Failure to follow the instructions in Section 1-1 could result in serious personal injury, death and/or property damage 3.4.1 POWER SUPPLY / BRANCH CIRCUIT WARNING: POWER SUPPLY INCOMPATIBILITY HAZARD Check power supply to make certain that voltage, frequency and current carrying capacity are in accordance with the motor nameplate.
WARNING: LOOSE & ROTATING PARTS HAZARD Before proceeding read Section 1-2 on Mechanical Safety. Failure to follow the instructions in Section 1-2 could result in serious personal injury, death and/or property damage WARNING: EXCESSIVE SURFACE TEMPERATURE HAZARD Motors with the temperature code stated on the nameplate are designed to operate within this limit. Improper application or operation can cause the maximum surface temperature to be exceeded.
Nameplate Ambient Temperature above 65°C (150°F): Dow Corning DC44 or equivalent, a special high temperature grease is required. Note that Dow Corning DC44 grease does not mix with other grease types. For RTD settings see Table 3-7. 4.2.2 BEARING OPERATING TEMPERATURE: CAUTION: HOT SURFACE The external surface temperature of the end shield (bracket) bearing hub may reach 100° C (212° F) during normal operation. Touching this surface may cause discomfort or injury.
1. 2. 4.2.4 LUBRICATION PROCEDURE: 3. 4. (For Motors with Regreasing Provisions) Table 4-1 list 10,000 hours for standard conditions. Table 4-2 classifies severity of service as “Severe” with a multiplier of 0.5. Table 4-3 lists a multiplier value of 0.5 for “Vertical” (Eq. 4.2) Interval = 10,000 hrs x 0.5 x 0.5 = 2500 hrs 3 CAUTION: BEARING DAMAGE WARNING Added grease must be compatible with the original equipment’s grease. If a grease other than those stated in 4.2.
4.3.2 Motor Trouble-shooting Cause / Corrective Action - Table 4-5 Issue: Likely Cause: Corrective Action: Motor fails to start upon initial installation: B.) Supply voltage is too low or is severely unbalanced (one (1) Check power supply fuses (2) Match motor lead wiring to nameplate connection diagram and supply voltage (3) Ensure that steady state supply voltage at motor terminals is within limits (see section 3.4.1.3). Correct as needed (4) Obtain correct Motor leads are miswired at conduit box.
E.) Motor is started too frequently See section 3.4.5.3 F.) Supply voltage too low, too high, or unbalanced (1) Ensure that steady state supply voltage at motor terminals is within limits (see section 3.4.1.3) Correct as needed (2) Reconnect motor per input voltage (3) Obtain correct motor to match power supply. Motor Vibrates A.) Motor misaligned to load. Realign load B.
B.) Input voltage exceeds limit Power surge to motor (caused by lightning strike or other C.) high transient voltage). Verify that voltage to the motor terminals is within limits (see section 3.4.1.3). If a common problem, install surge protector.
