Dodge 11 D Manuale di istruzioni - Pagina 2

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The amount of flow charge in the FLEXIDYNE determines the

acceleration time for a given load. Longer acceleration times will

occur when less flow charge is used and faster acceleration, from

stop to full speed, will be observed with greater amounts of flow

charge.

In-rush Amps

400

300

200

100

Seconds from Start

Figure 2 - Flow Charge

OPERATION

The FLEXIDYNE should start the load smoothly and without

delay provided the proper amount of flow charge has been used.

Should the acceleration time exceed the maximum allowable in

Table 1, shut off power to the FLEXIDYNE immediately. Allow the

FLEXIDYNE to cool, then add small amounts of flow charge until

proper acceleration is observed.

Vibration is an indication of accelerating too rapidly and not

allowing flow charge to become evenly distributed in the

FLEXIDYNE housing. This can be corrected by removing small

amounts of flow 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 can, without slipping, transmit

overloads up to 130% of its present starting torque. Should

this breakaway torque be exceeded the FLEXIDYNE will slip

and generate heat (see Overload Protection). Although slippage

usually indicates increased loads, it can also be caused by worn

flow charge or a worn rotor especially if the FLEXIDYNE has been

in operation for some time. The necessity to replace either a rotor

or flow charge will be made evident by a loss in power transmitting

capacity of the FLEXIDYNE.

MAINTENANCE

For average industrial applications involving 3 or 4 starts a day of

not mere than 6 seconds acceleration time each, the flow charge

should be changed every 10,000 hours of operation. For more

severe conditions, visually inspect flow charge at more frequent

intervals; it should be changed when it has deteriorated to a

half powder, half granular condition. Visual inspections should

continue until enough flow charge changes have been made to

adequately establish a schedule for renewing FLEXIDYNE flow

charge.

The FLEXIDYNE has been lubricated at the factory and no

further lubrication is required. Never apply grease, oil or any

other foreign material to the flow charge.

Acceleration Amps

Lock-In

Running

Amps

THERMAL CAPACITY

Since there is slippage within the flow charge during acceleration,

heat is generated from friction. The thermal capacity of the

FLEXIDYNE 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 flow charge weight is light, the heat generated

will not be as great as that which would be generated with a

heavier flow 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)

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

operation is 1 to 1½ seconds. This is the time required for the

flow 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 specific acceleration time (within these

limits) flow charge may be added or removed to produce the

required results.

Stalled – If a jam-up stalls the drive, the motor continues to run

and the FLEXIDYNE 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 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.

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.