Ametek 925 Series User manual

SERIES 925 (A1 & A2)
INSTALLATION & SERVICE BULLETIN
1080 N. Crooks Road, Clawson, MI 48017-1097
Phone [phone] FAX [phone]
For Sales & Technical Assistance Call 800-635-0289
A Product of
FORM1054
Rev. B
5/1/03
The instructions that follow are intended for
use with the 925 A1 and 925 A2 models.
They also are to be used for all outputs
whether Patriot Sensors & Controls resolver,
potentiometers, encoders, or customer
resolvers. The latter will also have additional
installation instructions.
INSTALLATION:
The 925 may be mounted in any position,
except for the two shown in Fig. 1 (Please
note the qualifier for the two positions.) 5/16”
dia. bolts are the preferred choice for
securing the unit to the base to which it is
mounted.
Fig. 1Positions not recommended
without external cable support.
Cable attachment is with the .19” dia. pin
provided on the cable end assembly. The
rubber bumper on the cable serves as a stop
for initial cable tension. The 925 unit is
shipped with the correct spring tension
applied (see Important Note under SPRING
TENSION ADJUSTMENT section for
information regarding spring tension). If
spring adjustment is absolutely necessary,
please see SPRING TENSION
ADJUSTMENT for proper tension adjusting
instructions.
If the 925 was ordered with initial cable lead,
the length will be marked with a steel clip. Do
not remove the top cover during installation.
If the unit has a standard Patriot Sensors &
Controls resolver installed, an input
connector plug (see drawing #SD0296000) is
included along with a wiring diagram (see
drawing #SD0308900) for the multiconductor
cable.
CABLE REPLACEMENT:
TOOLS REQUIRED:
5/64” ALLEN WRENCH
FLAT BLADE SCREWDRIVER
1) Remove the top cover and release spring
tension, if any (see SPRING TENSION
ADJUSTMENT section ). Between the top
cover and the spring housing there is an
access hole (see Fig. 2).
Fig. 2 Location of screw access hole.
Rotate the drum until the end of a button
head socket screw appears (by looking
through the access hole). Remove this screw
with the Allen wrench (NOTE: Care must be
taken when removing the screw so as to
prevent the screw from falling off inside the
enclosure). Pull all remaining cable free from
the drum.
2) The new cable end should lay in the
machined pocket on the drum (see Fig. 3).
Re-insert screw through cable end eye and
into threaded hole on drum with Allen wrench
and tighten.
Fig. 3Location of pocket on cable
drum.
Test the integrity of the cable anchor by
tugging on the cable once or twice.
3) To wind the new cable on the drum easily,
the recoil springs(s) should be disconnected
from the drum shaft. See SPRING TENSION
ADJUSTMENT section for instructions on
how to disconnect the spring(s).
4) After the spring(s) have been
disconnected, rotate the drum until all the
cable has been stored. Make sure that the
cable is fed into the first drum groove
correctly. If not, the cable will interfere with
the cable guide (gray steel bar across drum)
and affect the operation of the unit.
5) Adjust spring tension (see item 3 under
SPRING TENSION ADJUSTMENT) and then
reassemble the rest of the 925 unit.
SPRING TENSION ADJUSTMENT
and REPLACEMENT:
TOOLS REQUIRED:
3/32” ALLEN WRENCH
SMALL FLAT BLADE
SCREWDRIVER
Important Note:
The following instructions should be used
only after repair or other remedial attention
has been given to the 925. Tension adjusting
is not necessary at the time of initial
installation since the proper tension has been
set before shipment. Increasing spring
tension is not the answer to erratic recoil
action since it only serves to mask the real
problem. Increasing spring tension decreases
cycle life. Carried to the extreme, it will pull
the cable out of the cable anchor, break the
spring through overload, or some similar
failure. These types of failures are not
covered by the warranty.
1) For safety reasons, all spring tension
adjustments should be conducted with the
cable retracted on the drum. At this time the
stored energy is at a minimum.
2) Loosen two of the three servo clamp
screws with the Allen wrench (see Fig. 4).
Grasp the spring housing firmly while
loosening the third screw. Relax any residual
tension. If spring removal and installation is
not required, refer to Item 3 of this section for
remaining tension adjustment instruction.
3) With the three servo clamp screws
installed, but not tightened, the cast
aluminum spring housing for the A1 model
and the plastic housing of the A2 should be
grasped firmly and rotated clockwise. The
rotation is 10 turns for the A1 and 15 turns for
the A2 model. Secure the three servo clamp
screws.
SPRING REMOVAL: A1
The spring housing assembly may be freed
by removing all three servo clamp screws.
Grasp spring cover, which is an aluminum
casting, and pull cover and spring free from
drum shaft roll pin (see Fig. 4). (CAUTION:
Cover and spring must be removed together
as one unit.) Spring may now be removed
for inspection or replacement by
disconnecting spring tang from the cover.
CAUTION: On reassembly, make sure hook
tang faces the same direction that it did at
disassembly.

SERIES 925 (A1 & A2)
INSTALLATION & SERVICE BULLETIN
1080 N. Crooks Road, Clawson, MI 48017-1097
Phone [phone] FAX [phone]
For Sales & Technical Assistance Call 800-635-0289
A Product of
FORM1054
Rev. B
5/1/03
SPRING REMOVAL: A2
The input from the drum shaft to the spring
package is similar to the A1 model, but
everything else is unique. Both spring tangs
are connected to the spring transfer
assembly (see Fig. 5).
CAUTION: The two spring tangs are reverse-
mounted to each other. It is important that the
direction of engagement on the steel lug is
noted when the springs are removed and
duplicated when reinstalled.
SPRING INSTALLATION: A1
1) Inspect the spring housing to see if a clear
plastic spacer is inside. If not, place it in now
before installing the spring.
2) Slide the “C” clamp (around the O.D. of the
spring) close to one edge of the spring. Drop
spring into the spring housing, ensuring that
the outer spring tang is aligned with the slot
on the housing, and the “C” clamp is facing
out.
3) Slip the blade of a small screwdriver under
the spring tang and guide the tang into the
housing slot. Grasp the spring by the “C”
clamp and push it into the housing with your
thumbs, removing the “C” clamp at the same
time. (CAUTION: The “C” clamp must not be
removed before placing the spring in housing.
The spring will unwind, causing bodily harm
and rendering the spring useless).
4) Seat the spring tang in the housing slot
securely, while removing the screwdriver.
5) Place the remaining plastic spacer over
the spring. While holding the spacer in the
housing, mount spring assembly to the 925
unit by sliding inner spring tang into slot on
5/16” rollpin. Hold the spring assembly in
place while re-attaching servo clamps. Do
not tighten clamps at this time.
6) Refer to step 3 under SPRING TENSION
ADJUSTMENT for adjusting spring tension.
SPRING INSTALLATION: A2
1) Refer to steps 1 and 2 of SPRING
INSTALLATION: A1, except when placing
the first spring into the spring housing, ensure
that the inner spring tang slides into the
rollpin mounted inside the spring housing.
2) Place spring transfer assembly over first
spring, seating the outer spring tang over the
horizontal steel bar on the transfer assembly.
Place another plastic spacer over the spring
transfer assembly.
3) Refer to step 2 of SPRING
INSTALLATION: A1 when installing the
second spring. When placing the spring into
the housing, ensure that the outer spring tang
is seated on the opposite side of the transfer
assembly bar as that of the first spring.
4) To complete spring installation, refer to
step 5 of SPRING INSTALLATION : A1.
5) Refer to step 3 under SPRING TENSION
ADJUSTMENT for adjusting spring tension.
For ordering information of replacement parts
for the 925 A1 or A2 unit, please refer to the
OPTIONAL SPARE PARTS segment of
SECTION 925 in the Gemco catalog.
Fig. 4Spring assembly parts - 925 A1
Fig. 5Spring assembly parts - 925 A2