NORD U21010 User Manual
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
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
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