Siemens RL Series Instructions Manual Download

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Maintenance

.or Cutoff Switches (for Electrically Operated Circuit Breakers)

Figure 1 0a.

Position 1. Springs discharged; motor in run position.

Position 1 .

Motor in Run Position.

(Note that

Figures 1 0a-1 0c are

depicted as viewed from below)

Figure 1 0a,

note that spring position lever (1 )

forward, actuating

both switches. Motor/gear position lever (2) is retracted. Motor cutoff

switch (3) is closed. Application of power at this time will cause the
motor to start, thereby charging the closing springs.

Figure 1 0b.

Pos

charging', motor not yet cutoff.

Position 2.

Motor Not Yet Cutoff.

While the springs are charging the motor/gear position lever (2) moves

forward, applying pressure to the switch actuating leaf. The spring

position lever (1 ) retracts

the springs reach full charge. The motor

cutoff switch (3) is closed and the motor is running.

i S SUE'

1 9

.. - . .

-----

Figure'10c.

Position 3. Springs charged; motor stopped.

Position 3.

Motor

The springs have reached charged position. The motor/gear lever (2)

has been retracted by roll pins on the large gear as the cam follower
(82,

Figure 2)

on the large spur gear has disengaged from the wind

and close cam (34,

Figure 2).

The motor cutoff switch (3) has opened,

stopping  the  motor  and  the  closing  coil  switch  (4)  has  closed .  U pon
application  of  power  to  the  closing  circuit,  the  breaker  will  close.
Switches then return to position  1

(Figure 1 0a).

Note:

position

3, there is clearance between both levers and the

switch  actuating  leaf  Clearance  may be  minimal  (approximately  1 /64"
to  1/1 6")  (0 .4-1 .6mm)  or  more.  It  is  important  to  completely  remove
pressure from the switch  actuating  leaf to be sure that the switches are
free to actuate.  Note:  due  to  pre-travel of the DC  version  of switch  (4),

the gap is measured between the actuating point of the DC switch (4)

and the levers. Verify that both switches have actuated at the specified

gap. The clearance is measured when both levers are provided with
maximum natural

lift

(closing cams in charged position and the spur

gear cam follower rotated to its bottom position). Adjustment is made
by carefully bending the end of the levers as indicated by arrows

(items 1 and 2) Do not bend the switch actuating leaf, unless

absolutely necessary.

IMPORTANT: If the motor cutoff switch (3) does not open, the

motor will continue to run and the cam follower (82, Figure 2) will

re-engage  wind  and  close  cam  (34,  Figure  2)  jamming  the  entire
mechanism,  possibly  stripping  gears  in  the  gear motor,  blowing
the  control  fuse,  or  damaging  the  motor.  To  free  a  jammed
mechanism,  it

necessary to either remove the gear motor, or,

alternatively, to rotate gear by using a ratchet wrench with 1 3/1 6
inch 1 2 point

socket

to rotate the motor pinion just enough to free

the jam.

The springs will discharge and the breaker

closes

when the gear

motor pinion is disengaged from the gear.

Use the manual charging mechanism or the maintenance closing

device to prevent this from happening. Move the manual handle
towards the charge position, applying force to the closing

springs, and