NORD Drivesystems U21010 - Manual

DRIVESYSTEMS
NORDISC
™
ADJUSTABLE SPEED DRIVES
RETAIN FOR FUTURE USE
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
HARMFUL SITUATION
STOP
Speed adjustments must be performed when the motor is
running to prevent possible damage to the traction drive
parts.
STOP
HARMFUL SITUATION
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.
2. NORDISC™ Friction Drive
The variable speed drive requires only minimal maintenance.
However, the friction ring is a wear item.
STOP
HARMFUL SITUATION
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 pe-
riodically 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 molybdenum-
based anti-seize compound.
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 instruc-
tions pertaining to safe handling, installation, and mainte-
nance of the electric motor.
Connect the motor in accordance with the wiring informa-
tion 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).
489
409
447
Hex Head
Screws (4X)
410
493
407
472 (474)
402
424
425
DRIVE DISK ASSEMBLY DRIVEN DISK ASSEMBLY
U21010 - 1 of 6
www.nord.com/docs 06.09.09
NORD Gear Corporation
Toll Free in the United States: 888.314.6673
NORD Gear Limited
Toll Free in Canada: 800.668.4378