Abb 75D, 75C, 70D, 70C User Manual

Instruction Manual for 70C, 70D 75C and 75D

FLEXIDYNE® Couplings and Drives

These instructions must be read thoroughly before installation or operation. This instruction manual was accurate at the time of printing. Please see baldor.com for updated instruction manuals.

Note! The manufacturer of these products, Baldor Electric Company, became ABB Motors and Mechanical Inc. on March 1, 2018. Nameplates, Declaration of Conformity and other collateral material may contain the company name of Baldor Electric Company and the brand names of Baldor-Dodge and Baldor-Reliance until such time as all materials have been updated to reﬂect our new corporate identity.

WARNING: To ensure the drive is not unexpectedly started, turn off and lock-out or tag power source before proceeding. Failure to observe these precautions could result in bodily injury.

WARNING: All products over 25 kg (55 lbs) are noted on the shipping package. Proper lifting practices are required for these products.

Motor Shaft

Housing

Flow Charge

Output Shaft

Housing

Flow Charge

Motor Shaft

DESCRIPTION

FLEXIDYNE dry uid couplings and drives are unique concepts to provide soft start and momentary overload protection for all types of driven equipment. Standard EMAB motors with RPM base speeds of 1750, 1160 or 860 are commonly used with a FLEXIDYNE coupling or drive, yet other available power sources may be used with the FLEXIDYNE mechanism.

The dry "uid" in the FLEXIDYNE housing is heat treated steel shot. A measured amount, referred to as ow charge, is added into a housing which has been keyed to the motor shaft. When the motor is started, centrifugal force throws the ow charge to the perimeter of the housing, packs it between the housing and the rotor which in turn transmits power to the load.

After the starting period of slippage between housing and rotor the two become locked together and achieve full load speed, operating without slip and with 100% efciency.

Consequently, the motor accelerates instantly to base speed, while the load starts gradually and smoothly.

WARNING: Because of the possible danger to person(s) or property from accidents which may result from the improper use of products, it is important that correct procedures be followed. Products must be used in accordance with the engineering information speciﬁed in the catalog. Proper installation, maintenance and operation procedures must be observed. The instructions in the instruction manuals must be followed. Inspections should be made as necessary to assure safe operation under prevailing conditions. Proper guards and other suitable safety devices or procedures as may be desirable or as may be speciﬁed in safety codes should be provided, and are neither provided by ABB nor are the responsibility of ABB. This unit and its associated equipment must be installed, adjusted and maintained by qualiﬁed personnel who are familiar with the construction and operation of all equipment in the system and the potential hazards involved. When risk to persons or property may be involved, a holding device must be an integral part of the driven equipment beyond the speed reducer output shaft.

Output Sheave

Rotor

Flexible Coupling

Rotor

Coupling Drives

Figure 1 - Housing cross section

INSTA LLATIO N

COUPLINGS:

Install coupling ange on motor shaft and drive housing mechanism on driven shaft in accordance with the instruction manual for the Taper-Lock® bushings.

NOTE: The coupling ﬂange must be mounted on motor shaft (not driven shaft) to allow proper operation of the FLEXIDYNE coupling.

Shaft ends must not protrude beyond bushing ends. Install coupling disc over pins on drive housing mechanism. Position the motor and the driven unit so that the spacer buttons on the coupling disc slightly contact the coupling ange. Reference Dimension A on Parts Replacement Drawing.

(A = 5/8” on size 70C; A = 3/4” on size 75C)

For longest FLEXIDYNE coupling life, it is always desirable to align coupling as accurately as possible at initial installation. Check alignment by laying a straight edge across the coupling ange and drive housing at several points around the circumference.

NOTE: Driven shaft must not touch housing hub.

DRIVES:

Install the FLEXIDYNE special bolt-on sheave on the driven hub. Use screws and lock washers provided with the FLEXIDYNE drive. Torque screws to 160 inch-pounds.

Stake motor shaft key in place and slide FLEXIDYNE drive onto the motor shaft, with collar as close to the motor as possible. Tighten key set screw securely against motor shaft key. Tighten shaft set screw securely against motor shaft.

Nameplate

Motor

Current

400

300

200

100

In-rush Amps

Acceleration Amps

Lock-In

Running Amps

NOTE: The sheave is the output of the FLEXIDYNE drive, do not input power to the FLEXIDYNE drive through the sheave. In other words, do not mount the FLEXIDYNE drive on the driven shaft.

START- UP

1. Remove the ller plug and install the proper amount of ow charge specied in Table 1. Replace and tighten ller plug, making sure that no ow charge is trapped in threads. Torque ller plug to 35 inch-pounds.

2. Attach AC ammeter (conventional clamp-on or equivalent) to one line of the AC motor. Set range to cover 200% of motor nameplate current.

3. Note the maximum allowable acceleration time as stated in Tables 1 and 2.

Note: Table 2 lists starting time capacity for starting cycles occurring more than once every 2 hours.

4. Push start button. Observe motor current during load acceleration and number of seconds required to reach full speed (Fig. 2).

Increase amount of ow charge if:

A. Acceleration time reaches maximum allowable before

load is up to speed. Turn off power immediately if this time is reached.

B. Acceleration amperage is below motor nameplate.

Decrease amount of ow charge if:

A. Acceleration time is less than 1-1/2 seconds. B. Acceleration amperage is above 200% of motor nameplate.

Once satisfactory operation has been obtained, record the

following for future reference:

1. The amount of ow charge

2. Starting current

3. Acceleration Time

Seconds from Start

Figure 2 - Typical Motor Current vs. Time

OPER ATION

The amount of ow charge in the housing determines the acceleration time for a given load. Slower acceleration times will occur when less ow charge is used and faster acceleration, from stop to full speed, will be observed with greater amounts of ow charge.

The FLEXIDYNE mechanism should start the load smoothly and without delay, provided the proper amount of ow charge has been used. Should the acceleration time exceed the maximum allowable in Table 1, shut off power to the FLEXIDYNE mechanism immediately. Allow the FLEXIDYNE mechanism to cool, then add small amounts of ow charge until proper acceleration is observed.

Vibration is an indication of accelerating too rapidly and not allowing ow charge to become evenly distributed in the FLEXIDYNE housing. This can be corrected by removing small amounts of ow charge until vibration subsides. Other causes of vibration are: undersize shafting, unit not installed far enough on shaft or worn bore in the unit.

Slippage — The FLEXIDYNE mechanism can, without slipping, transmit overloads up to 130% of its pre-set starting torque. Should this breakaway torque be exceeded, the FLEXIDYNE mechanism will slip and generate heat (see Overload Protection). Although slippage usually indicates increased loads, it can also be caused by worn ow charge or a worn rotor especially if the FLEXIDYNE mechanism has been in operation for some time. The necessity to replace either a rotor or ow charge will be made evident by a loss in power transmitting capacity of the FLEXIDYNE mechanism.

WARNING: The rotor must slip during acceleration to allow ﬂow charge to become evenly distributed in the FLEXIDYNE housing. Therefore, DO NOT ALLOW FLEXIDYNE MECHANISM TO RUN "FREE" (that is, without a load on the driven end), otherwise an out-of-balance condition may result, damaging mechanism and attached equipment.

MAINTENANCE

For average industrial applications involving 3 or 4 starts a day and of not more than 6 seconds acceleration time each, the ow charge should be changed every 10,000 hours of operation. For more severe conditions, visually inspect ow charge at more frequent intervals; it should be changed when it has deteriorated to a half powder, half granular condition. See page 8 for ow charge analysis. Visual inspections should continue until enough ow charge changes have been made to adequately establish a schedule for renewing FLEXIDYNE ow charge.

The FLEXIDYNE mechanism has been lubricated at the factory and no further lubrication is required. Never apply grease, oil or any other foreign material to the ow charge.

THERMAL CAPACITY

Since there is slippage within the ow charge during acceleration, heat is generated from friction. The thermal capacity of the FLEXIDYNE mechanism is based on balancing this heat generated during acceleration against the cooling time between accelerations. The amount of heat generated is determined by the amount of horsepower dissipated by slipping and the duration of each acceleration. If the ow charge weight is light, the heat generated will not be as great as that which would be generated with a heavier ow charge, when compared at the same acceleration time. A longer time between starts will dissipate more heat; therefore, higher starting horsepowers may be transmitted, or longer acceleration times may be allowable. (See Starting Cycle)

Stalled — If a jam-up stalls the drive, the motor continues to run and the FLEXIDYNE mechanism slips. This causes heat to be generated at twice the rate of normal acceleration. Therefore, the allowable slipping time, when stalled, is half the allowable acceleration time given in Table 1.

Starting Cycle is the time from the beginning of one acceleration to the beginning of the next. Allowable acceleration times in Table 2 are based on the assumption that the FLEXIDYNE mechanism will be running continuously except for a momentary stop before the next start. If the stop is more than momentary, decrease the actual starting cycle by one-half the stopped time before using Table 2; for example, with a 50 minute actual starting cycle of which 20 minutes is stopped time, decrease 50 by half of 20 to give 40 minutes as the starting cycle time to use for Table 2.

Acceleration times shown in Table 1 are for starting frequencies of one start per hour or less. If starting frequency is more than once per hour, use acceleration time for actual starting cycle shown in Table 2.

Acceleration times listed in Tables 1 and 2 are the MAXIMUM permissible for the various starting frequencies listed. The MINIMUM acceleration time required for proper FLEXIDYNE mechanism operation is 1 to 1½ seconds. This is the time required for the ow charge to be uniformly distributed around the housing cavity before the unit "locks in". Any acceleration time between the minimum and maximum listed is acceptable, although a shorter acceleration time will generally provide longer wear life. For applications requiring a specic acceleration time (within these limits) ow charge may be added or removed to produce the required results.

Grouped Starts — For several starts grouped together followed by uninterrupted running, add the acceleration times of all starts and consider it as the time for one start. The starting cycle would be the time from the beginning of one group of starts to the beginning of the next group.

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