Dodge FLEXIDYNE 75D Gebrauchsanweisung - Seite 3

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THERMAL CAPACITY

Since there is slippage within the flow 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 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

mechanism 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 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.

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.