DESCRIPTION
FLEXIDYNE dry fluid couplings are a unique concept to provide soft start and momentary overload protection for all types of driven equipment. Standard
The dry "fluid" in the FLEXIDYNE is heat treated steel shot. A measured amount, referred to as flow charge, is added into a housing which has been keyed to the motor shaft. When the motor is started, centrifugal force throws the flow 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% efficiency.
Consequently, the motor accelerates instantly to base speed, while the load starts gradually and smoothly.
INSTALLATION
Method 1:
Install coupling flange on motor shaft and drive housing mechanism on driven shaft in accordance with the instructions packaged with the
Method 2:
If motor and driven unit are to be positioned before mounting FLEXIDYNE, shaft ends should be spaced apart by dimension "B" on page 5. Slide bushing and coupling flange onto motor shaft. Install coupling disc over pins on drive housing mechanism. Install drive housing mechanism on driven shaft and coupling flange on motor shaft per instructions packed with the
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 flange and drive housing at several points around the circumference.
FLEXIDYNE Size | 9C | 11C |
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Dimension “A” | 7/8 | 11/8 |
Dimension “B” | 51/8 | 61/8 |
START-UP
1.Remove one of the filler plugs and install ½ the proper amount of flow charge specified in Table 1. Replace and tighten filler plug, making sure that no flow charge is trapped in the threads. Remove other filler plug and install the remaining ½ of specified amount of flow charge repeating the same procedure. Tighten filler plug to 200
2.Attach AC ammeter (conventional
3.Note maximum allowable acceleration time for FLEXIDYNE 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 flow 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 flow charge if:
A.Acceleration time is less than 1½ seconds.
B.Acceleration amperage is above 200% of motor nameplate.
Caution: The rotor of the FLEXIDYNE must slip during acceleration to allow flow charge to become evenly distributed in the FLEXIDYNE housing. Therefore, DO NOT ALLOW FLEXIDYNE TO RUN "FREE" (that is, without a load on the driven end), otherwise a dangerous out-
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.
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, worn bore in the unit, or
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.