Installation instructions

GEI-M1011A
Table 1
Frame Size XH
213-215 50.8 mm (2.00 in.)
254-256 57.15 mm (2.25 in.)
284-286 63.5 mm (2.50 in.)
324-326 95.25 mm (3.75 in.)
364-365 95.25 mm (3.75 in.)
404-405 101.6 mm (4.00 in.)
444-449 111 mm (4.38 in.)
509-5011 123.825 mm (4.88 in.)
Depending upon the circumstances causing reversal and
upon which line-shaft joint unscrew, there may be enough
energy stored in the rotating parts, at the time the coupling
clears the pins, to cause the pump shaft to continue to rise
and strike the top cap. However, if the above conditions are
met, damage, even in the most severe cases, should be
limited to a broken top cover or fan.
It is intended that self-release couplings will be called upon
to uncouple only infrequently.
NOTE: Anytime a self-release coupling
uncouples, it is necessary to remove
all power and manually recouple.
Uncoupling is most frequently caused by application of
single-phase power after a power supply disturbance, while
the motor is being driven in the reverse direction by the
pump; this single phase power causes the motor to take
over and drive the pump in the reverse direction and the
pump shaft joints will then unscrew. To prevent this, select
a motor starter which requires a manual start after any stop
(rather than allowing automatic re-start as soon as power is
applied to the starter), or incorporates a back spin timer to
keep power from being automatically reapplied to the
motor until enough time has elapsed for water back-flow
through the pump to stop and for the motor to completely
stop.
Power supply phase-sequence reversal will also cause the
motor to reverse and unscrew the pump shaft, but this
rarely occurs. An antiphase-reversal relay can be
incorporated in the motor controller if desired.
To prevent uncoupling on initial start-up, check motor
rotation direction before installing the upper half-coupling
to be sure direction is correct. To reverse direction of
rotation, interchange any two power leads.
3. Bolted Couplings
Bolted couplings allow up thrust from the pump to be
taken by the motor bearings. This type of coupling is
similar to a self-release coupling except that the driving
pins are replaced by bolts, which should be securely
tightened to hold the two halves of the coupling solidly
together so that torque is transmitted by face friction. See
Torque Requirements. This type of coupling does not
have the self-release feature and allows reverse rotation.
See the self-release coupling shown to the left of the motor
center line in Figures 4-6 which is applicable to bolted
couplings except that the headless drive pins are replaced
by bolts as explained above.
To install a motor with a bolted coupling, first unbolt and
remove the fan, thus exposing the coupling bolts. Then
unbolt and remove the upper half-coupling. Next, lower the
motor onto the pump with pump shaft through the motor
shaft. Then set the upper half-coupling into place on the
lower half-coupling and put the gib key in place, tightening
the bolts. Then put the pump nut in place, adjust the pump
and lock the nut. Finally, put the fan in place on the upper
half-coupling and secure it with the 3 cap screws provided.
4. Non-Reverse Couplings
The non-reverse type of coupling, as shown to the right of
the motor centerline in Figures 4-6, is also a bolted type,
and, in addition, it keeps the pump and motor from rotating
in the reverse direction. Thus, it not only prevents the
pump shaft from unscrewing, but it also prevents damage
from over speeding and damage to water lubricated pump
shaft bearings, when during shutdown the residual water in
the system drives the pump in the reverse direction. This
type of coupling also allows up thrust from the pump to be
carried by the motor bearings. Motor torque is transmitted
to the pump shaft through the two halves of the coupling
which are bolted together. See Required Bolt Torques.
To install a motor with a non-reverse coupling, first unbolt
and remove the fan, thus exposing the coupling bolts. Next,
put the fan bolts back in place to secure the pin retaining
plate to the pin carrier and keep the non-reverse assembly
from flying apart. Then, unbolt and remove the upper half-
coupling and non-reverse assembly. Next, lower motor
onto the pump with pump shaft through the motor shaft.
Then set the upper half-coupling and non-reverse assembly
into place on the lower half-coupling and bolt it to the
lower half-coupling, tightening the bolts. Then install the
gib key and pump shaft nut, adjust the pump and lock the
nut. Finally, remove the three small cap screws securing
pin retaining plate, put the fan in place and secure it with
these same cap screws.
The operation of a non-reverse coupling is explained as
follows. When the motor is started in the correct or
forward direction, the ratchet pins are lifted by the ratchet
teeth and are held up by centrifugal force and friction when
motor speed becomes high enough. When power is
removed, the speed decreases, and the pins fall. At the
instant of reversal, a pin will catch on a ratchet tooth and
prevent backward rotation. The number of pins differs
from the number of teeth to multiply the number of
stopping positions.
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