Omron OMNUC U Series User Manual page 35

System Design and Installation
Bevel gears will cause a load to be applied in the
thrust direction depending on the structural preci-
sion, the gear precision, and temperature changes.
Provide appropriate backlash or take other mea-
sures to ensure that no thrust load is applied which
exceeds specifications.
Do not put rubber packing on the flange surface. If
the flange is mounted with rubber packing, the motor
flange may separate due to the tightening strength.
When connecting to a V-belt or timing belt, consult the maker for belt selection and tension. A radial
load twice the belt tension will be placed on the motor shaft. Do not allow a radial load exceeding
specifications to be placed on the motor shaft due to belt tension. If an excessive radial load is ap-
plied, the motor shaft may be damaged. Set up the structure so that the radial load can be adjusted. A
large radial load may also be applied as a result of belt vibration. Attach a brace and adjust Servo
Driver gain so that belt vibration is minimized.
Water and Drip Resistance
The Servomotor does not have a water-proof structure. Except for the connector areas, the protec-
tive structure is covered by the following JEM (The Japan Electrical Manufacturers' Association)
standards.
Non-conforming Models:
EC Directive Models:
If the Servomotor is used in an environment in which condensation occurs, water may enter inside of
the encoder from the end surfaces of cables due to motor temperature changes. Either take mea-
sures to ensure that water cannot penetrate in this way, or use water-proof connectors. Even when
machinery is not in use, water penetration can be avoided by taking measures, such as keeping the
motor in servo-lock status, to minimize temperature changes.
If machining oil with surfactants (e.g., coolant fluids) or their spray penetrate inside of the motor, in-
sulation defects or short-circuiting may occur. Take measures to prevent machining oil penetration.
Other Precautions
Do not apply commercial power directly to the Servomotor. The Servomotors run on synchronous
AC and use permanent magnets. Applying 3-phase power will burn out the motor coils.
Do not carry or otherwise handle the Servomotor by its cable, otherwise the cable may become dis-
connected or the cable clamp may become damaged.
Take measures to prevent the shaft from rusting. The shafts are coated with anti-rust oil when
shipped, but anti-rust oil or grease should also be applied when connecting the shaft to a load.
Absolutely do not remove the encoder cover or take the motor apart. The magnet and the encoder
are aligned in the Servomotor. If they become misaligned, the motor will not operate.
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Pulley
Belt Motor shaft
Tension
IP-42
IP-44 (except shaft penetration point)
Make moveable.
Make adjustable.
Load shaft
Chapter 2
Bevel gear
2-17