Baldor 9C Manual De Usuario

FLEXIDYNE dry fluid couplings are a unique concept 

to provide soft start and momentary overload protection for 
all types of driven equipment. Standard NEMA-B motors 
with RPM base speeds of 1750, 1160 or 860 are 
commonly used with a FLEXIDYNE, yet other available 
power sources may be used with the FLEXIDYNE. 

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. 

 

 

Install coupling flange on motor shaft and drive 

housing mechanism on driven shaft in accordance with the 
instructions packaged with the TAPER-LOCK

®

 bushings 

(Manual #499645). 

 

Shaft ends must 

not protrude beyond bushing ends. Install coupling disc 
over pins on drive housing mechanism. Position motor and 
driven unit so that spacer buttons on coupling flange just 
contact the drive housing and coupling flange (Reference 
dimension "A" on page 5). 

 

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 TAPER-LOCK 
bushings, so that the spacer buttons on the coupling disc 
just contact the drive housing and coupling flange 
(Reference dimension "A" on page 5). 

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 

Dimension “A” 

7

/

8

 

1

1

/

8

 

Dimension “B” 

5

1

/

8

 

6

1

/

8

 

 

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 
inch-pounds torque. 

Attach AC ammeter (conventional clamp-on or 

equivalent) to one line of the AC motor. Set range to cover 
200% of motor nameplate current. 

Note maximum allowable acceleration  time for 

FLEXIDYNE as stated in Tables 1 and 2. 

Table 2 

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

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: 

Acceleration time reaches maximum allowable 
before load is up to speed. Turn off power 
immediately if this time is reached. 

Acceleration amperage is below motor nameplate. 

Decrease amount of flow charge if: 

Acceleration time is less than 1½ seconds. 

Acceleration amperage is above 200% of motor

nameplate. 

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-
of-balance condition may 
result. 

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. 

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 mis-alignment. 

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.