Page 1
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
U21010 - 1 of 6
1. Basic operation and speed adjustment
The NORDISC™ Friction Drive will supply infi nite variable
speed adjustments over a fi xed speed range. The NORDISC™
Drive consists of a motor, dry traction drive, and main gear
drive. The motor is typically furnished as an integral mount
to the traction drive, however a NEMA C-face Input Adapter
(Flex-C-Input Adapter) is also available.
Attached to the output shaft of a constant speed motor, is
the driving disc portion of the traction drive. The driven disc
is angled approximately 2º, localizing the friction contact on
the disc pair. As the adjustment spindle is rotated, the input
side of the housing moves either up or down, changing the
effective pitch diameter of the driving disc. Speed is typically
adjusted by the handwheel.
STOP
Speed adjustments must be performed when the motor is
running to prevent possible damage to the traction drive
parts.
STOP
Initial adjustments of the speed stops located internal to
the traction drive are completed at the factory. Further
adjustments of the speed stops can cause damage to the
traction drive and/or main drive.
HARMFUL SITUATION
HARMFUL SITUATION
STOP
STOP
2. NORDISC™ Friction Drive
The variable speed drive requires only minimal maintenance.
However, the friction ring is a wear item.
STOP
The traction drive should be periodically operated through
its entire speed range, in order to prevent localized wear
patterns on the driving disc and/or possible damage to the
driving disc.
The friction drive does not require lubrication unless it is
disassembled for an overhaul. Units should be checked periodically for:
• Increased noise level.
• Increased operating temperatures.
• Increased vibration.
• Increased motor amperage draw.
• Increased or excessive shaft movement.
Every 10,000 hours of operation, it is suggested that the
bearings be cleaned and re-greased with a lithium-based
NLGI #2 Grease.
The adjustment wheel and speed adjustment shaft should
also be cleaned periodically and coated with molybdenumbased anti-seize compound.
HARMFUL SITUATION
STOP
3. Motor
WARNING
To prevent possible injury and/or damage to the electric
motor, the variable speed drive, or the driven equipment,
it is important to follow the motor manufacturer’s instructions pertaining to safe handling, installation, and maintenance of the electric motor.
Connect the motor in accordance with the wiring information supplied by the motor manufacturer and make sure the
motor nameplage voltage and frequency agree with the
available power supply. Use the proper protective motor
switches to help protect the motor windings from overload
and/or phase failure.
WARNING
Explosion proof motors should not be used on the friction
drive. The friction drive is not recommended for use in
explosion proof atmospheres.
4. Seperating the driven disc assembly from the
driving disc assembly
A. Lockout the electric power to the motor and make sure
the wires are disconnected.
B. Support the intermediate housing (Item 447) and the
attached motor assembly.
C. Remove the four hex head screws that connect the
driving disc assembly (intermediate housing / Item 447)
to the driven disc assembly (output housing / Item 402).
D. Slide the intermediate housing (Item 447) away from the
output housing (Item 402).
447
472 (474)
409
410
424
425
Hex Head
Screws (4X)
402
407
493
489
NORD Gear Limited
Toll Free in Canada: 800.668.4378
DRIVE DISK ASSEMBLYDRIVEN DISK ASSEMBLY
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Page 2
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
U21010 - 2 of 6
5. Friction disc replacement
A. Separate the driven disc assembly from the driving disc
assembly (See Separate Instructions).
B. Once the friction disc (Item 409), is exposed remove the
socket head cap screws (Item 410) that hold the friction
disc or friction ring (Item 409) to the friction disc carrier
(Item 407).
C. Clean the contact surface between the friction disc and
friction disc carrier.
D. Vacuum or brush out the NORDISC™ drive housing to
remove accumulated friction material dust. Be careful
not to ingest dust while cleaning.
E. Inspect main housing for damaged parts while
disassembled.
F. Attach the new friction disc to the carrier using the
socket head cap screws. Permissible tightening torques
are per the table below:
Type Screw
Size
RV10 M5 X 12 8.8 6 N-m / 53 lb-in
RV20 M5 X 16 8.8 6 N-m / 53 lb-in
RV30 M6 x 16 8.8 10 N-m / 88 lb-in
RV40 M6 x 20 8.8 10 N-m / 88 lb-in
G. Re-assemble intermediate housing or “RV” housing
(Item 447) to output bearing housing (Item 402). To
re-assemble, apply Steps 1-4 in reverse order. Use a
thread-locking compound to secure the hex head
screws.
Material
Grade
Tightening
Torque
6.
Bearing and seal replacement - NORDISC™ output
A. Separate the driven disc assembly from the driving disc
assembly (See Separate Instructions).
B. Slide the intermediate housing (Item 447) away from
the output housing (Item 402) and remove the shaft oil
seal (Item 439).
C. Remove circlips/snap-rings (Item 437 and 438).
D. Remove shims and supporting disc (Items 434 & 436).
E. Slide the hollow shaft/friction disc carrier assembly
(Item 404) away from output housing (Item 402).
F. Press output gear-shaft (Item 424 or 425) and bearing
(Item 435) out of output housing. Shaft and bearing
come out on the output or gear-shaft side.
G. Remove oil seal (Item 421) from output housing.
H. Remove two circlips/snap-rings (Items 418) from output
housing and remove needle bearings and spacer (Items
419 and 420).
I. Re-assemble in the reverse order, replacing ball bearing,
needle bearings, and oil seals (Items 435, 419, 421 and
439). If required, also replace any shims, spacers, or
circlips (Items 434, 436, 420, 437, 438, and 418).
During assembly, repack bearings with a lithium-based
NLGI #2 grease. Needle bearing cavity should be
approximately 1/3 full after re-greasing.
WARNING
• The output shaft compression spring (Item 430) does
not require maintenance. If the spring fractures the
complete shaft should be replaced as a complete
assembly or returned to NORD Gear for repair.
• Special fi xtures are required to remove and install the
spring. Personal injury can result if this repair is
attempted in the fi eld.
NORD Gear Limited
Toll Free in Canada: 800.668.4378
419
420
430
419
418
407
409
410
421
438
436
434
437
424
425
439
435
402
418
404
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Page 3
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
U21010 - 3 of 6
7. Driving disc dissassembly and reassembly
The driving disc (Item 489) is attached directly to either the
motor shaft or the shaft of the C-Face Input (Flex-C-Input)
Adapter. One must fi rst remove the driving disc from the
input-side of the NORDISC™ in order to:
• Replace the motor.
• Replace the bearings in the C-Face Adapter.
Driving Disc Removal
A. Separate the driven disc assembly from the driving disc
assembly (See Separate Instructions).
B. Slide the intermediate housing (Item 447) away from
the output housing (Item 402).
C. After removing the input side from the output side,
position the driving disc (Item 489) in the middle of the
housing by turning the speed adjusting hand wheel
(Item 462).
D. Remove the setscrew in the middle of the driving disc
(Item 493). Insert a hardened bolt in the hole that is in
the center of the driving disc (Item 489), and tighten
the bolt against the shaft to separate or remove the
driving disc from the shaft (see table).
Type Setscrew Size Bolt Size
RV10 1/4-20 1/4-20 x 2-1/4 in
RV20 5/16-18 5/16-8 x 2-3/4 in
RV30 1/2-13 1/2-13 x 3 in
RV40 5/8-11 5/8-11 x 4 in
Driving Disc Re-Assembly
A. Installation of the driving disc (Item 489) may require
heating the disc in an oven or on a hot plate, to allow
the disc to be positioned all the way on to the motor
shaft or C-Face Input shaft.
WARNING
Exercise extreme caution when handling the hot driving
disc. Protective gloves are recommended.
B. After heating the disc, position it all the way onto the
shaft until it bottoms.
C. Using the table below, measure the “X” dimension
from the bottom edge of the friction drive housing
(Item 447) to the face of the driving disc (Item 489).
Type Setscrew Size “X” Dimension
RV10 1/4-20 0.837/0.867 in
RV20 5/16-18 0.975/1.005 in
RV30 1/2-13 1.133/1.163 in
RV40 5/8-11 1.311/1.341 in
D. Insert the setscrew (Item 493) into the hole in the center
of the driving disc, and tighten the setscrew snug to the
shaft of the motor or C-Face input assembly. Use a
thread-locking compound to help secure the setscrew.
447
472 (474)
489
493
MEASURING
DEVICE
"X"
NORD Gear Limited
Toll Free in Canada: 800.668.4378
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Page 4
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
U21010 - 4 of 6
Removal and re-assembloy of motor or C-face input adapter
(Flex-C-Input)
A. Separate the driven disc assembly from the driving disc
assembly and remove the driving disc (See Separate
Instructions).
B. After removing the driving disc (Item 489), the mounting
bolts for the motor or C-Face adapter can be accessed.
To gain access to all four bolts requires the removal of
the two cam grooves (Item 477). The cam grooves can
be removed by fi rst removing the socket head screws
(Item 478). Then, the motor or adapter bolts ((Item 453)
can be removed.
C. Assembly is the reverse of disassembly.
465
462
472 (474)
477
478
479
MOTOR / C-FACE ADAPTER
MOTOR BOLTS (4X)
IMPORTANT NOTE
The cam grooves or tapered gibs (Item 477) need to be
adjusted during assembly.
Cam groove or tapered gib adjustment
The cam groove or tapered gib on the right side (Item 477)
is not adjustable. The cam groove on the left-hand side
is to be adjusted by the screws (Item 479) located next to
the slide bar (Item 477). The cam grooves are properly adjusted when the slide plate (Item 472 or 474) is allowed to
move freely through its complete range.
A. Remove the handwheel assembly nut (Item 465) and
handwheel (Item 462) before making adjustment.
B. Clean sliding surfaces of the slide plate and cam grooves,
and then re-apply a molybdenum-based anti-seize com
pound to these surfaces.
C. Assemble the motor and/or c-face adapter to the slide plate (Item 472/474) by re-installing the motor bolts.
Apply a thread-locking agent to the screw threads
during assembly.
D. Place the non-adjustable (right-side) cam groove onto
the slide plate and tighten the socket head setscrews
(Item 478). Apply a thread-locking agent to the screw
threads during assembly
E. Place the intermediate housing (Item 447) onto the
slide plate (Item 472 or 474) and then install the adjust able (Left-side) cam groove (Item 477).
F. Install the socket head screws (Item 478) and the adjust ment setscrews (Item 479). Apply a thread-locking
agent to the screw threads during assembly. Do not
completely tighten either set of screws – follow Steps 7
& 8!
G. Adjust the cam groove set screws (Item 479) so that
there is minimal side-play or side-movement and be
certain that the friction drive housing (Item 447) can
move freely.
H. Then, tighten the socket head setscrews (Item 478).
I. After completing the adjustment of the cam grooves
(Item 477) the handwheel (Item 462) and handwheel
assembly nut (Item 465) can be re-installed.
J. Re-assemble the driving disc and re-connect the driving
disc assembly and the driven disc assembly.
NORD Gear Limited
Toll Free in Canada: 800.668.4378
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Page 5
DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
U21010 - 5 of 6
Item 426 (Shaft assembly) and Item 405 (Friction ring
carrier assembly) are stocked as complete assemblies.
Item 409 (Friction disc) can be ordered separately per
the Table on page 6.
™
NORDISC
402 Housing
418 Snap Ring
419 Needle roller bearing
420 Spacer
421 Seal
434 Shim
435 Ball Bearing
436 Supporting disc
437 Snap ring
438 Snap ring
439 Seal
440 Key
441 Snap ring
443 Oil plug
444 Gasket
445 Flanged eye bolt
447 Intermediate housing
450 Set screw
451 Bore plug
452 Spindle cover
454 Socket head screw
455 Snap ring
Parts List
456 Adjusting spindle
460 Key
462 Hand wheel
464 Washer
465 Hex nut
468 Scale
469 Rivet / self-tapping screw
472 Slide-plate (NEMA)
474 Slide-plate (IEC)
477 Cam groove / taper gib
478 Socket head screw
479 Screw
481 Set screw
483 Spindle nut
484 Socket head screw
486 Indicator
487 Indicator screw
489 Driving disc
491 Supporting disc
492 V-ring seal
493 Set screw
426 Complete shaft assembly
424 Shaft, plain cut *
425 Shaft, gear cut *
430 Compression spring *
433 Dowel pin *
432 Spiral pin *
* Included with Item 426
405 Friction ring carrier assy
406 Hollow shaft **
407 Friction ring carrier **
409 Friction disc **
410 Socket head screw **
411 Washer **
413 Needle roller bearing **
414 Washer **
415 Snap ring **
416 Bore plug **
** Included with Item 405
NORD Gear Limited
Toll Free in Canada: 800.668.4378
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Page 6
™
NORDISC
DRIVESYSTEMS
8. NORDISC™ FRICTION DISC REPLACEMENT PART NUMBERS
NORDISC™ Type RV10 RV20 RV30 RV40
Item 409 - Friction Disc Part Number 79119000 79219000 79319000 79419000
9. TROUBLESHOOTING
Problem With Variable Speed Unit Possible Causes Suggested Remedy
Drive Slips. Friction Disc is worn. Friction Disc or
Drive heats up excessively. Load is too high. Check measured power and reduce
Drive appears noisy or too loud. Friction Disc is damaged:
Adjust rate is too low. Sluggish adjustment rate may be due to
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
Drive Disc face is dirty or contaminated.
Load is too high.
• May be caused after a brief stalling
of the drive.
• May be caused by intermittent load ing of the drive.
corrosion between the slide plate and
the cam grooves that are internal to the
intermediate housing.
Replace Friction Disc (Page 3).
Clean Contaminated part:
• Friction Disc – use dry cloth or paper.
• Drive Disc – okay to use mild solvent
provided excess is removed or cleaned
with a dry cloth. Check measured
power and reduce operating load to
catalog values.
operating load to catalog values.
Determine cause of damage, and
replace friction disc (Page 3).
Re-establish low-friction conduction.
• Separate driven disc assembly from
driving disc assembly.
• Clean and re-lubricate slide plate
and cam grooves by applying a
molybdenum-based anti-seize com pound to these surfaces.
• In extreme instances it may be nec essary to remove the motor and
cam grooves in order to thoroughly
clean the cam grooves and slide
plate.
Reference instructions on Page 4, “Cam
Groove or Tapered Gib Adjustment”.
U21010 - 6 of 6
NORD Gear Limited
Toll Free in Canada: 800.668.4378
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
www.nord.com/docs06.09.09
Loading...