Specifications

22
ELECTRIC MOTOR INFORMATION
SAFETY:
The use of electric motors and generators, like that of all other utilization of concentrated power, is potentially hazardous. The degree of hazard can be gratly reduced
by proper design, selection, installation and use, but hazards cannot be completely eliminated. The reduction of hazard is the joint responsibility of the user, the manufacturer of
the driven or driving equipment and the manufacturer of the motor or generator.
Motor products are designed and manufactured to comply to applicable safety standards and in particular to those issued by ANSI (American National Standards
Institute), NEMA (National Electrical Manufacturers Association), UL (Underwriters Laboratories, Inc) and CSA (Canadian Standards Association).
However, since even well-built apparatus can be installed or operated in a hazardous manner, it is important that safety considerations be observed by the user. With
respect to the load and environment, the user must properly select, install and use the apparatus - for guidance on all three aspects see safety standars publication No.
ANSI/NEAM MG-2.*
Standars Publication No. ANSI/NEMA MG-2. "safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators."
SELECTION:
Before proceeding with the installation, the user should review the application to confirm that the proper drive has been selected. This should be done after reading this notice and
all applicable safety standards. If in doubt, contact your L-R Reprentative in your area. Any selection or application suggestions made are only to assist the customer - and in all
cases, determination of fitness for purpose or use is solely the customer's responsibility.
Inspection: Examine for damage from shipment before connecting. Any claim (s) for shipping damage should be made to the freight carrier. do not attempt to turn the output shaft
of a gearmotor with an externally applied torque arm.
Mounting: Any screws, or similar devices, that penetrate the motor frame either for mounting the product or mounting something to the product should be limited in length so as
not to come in contact with or in close proximity to, intended features that conduct electricity. Spacings as high as.158" may be required based on voltages and circuitry involved.
Connection: Follow nameplate for voltage, frequency and phase of power supply. When connecting, make sure that your motor/gearmotor is securely and adequately grounded -
failure to ground properly may cause serious injury to personnel.
USE Additional Safety Considerations
The chance of electric shocks, fires or explosions can be reduced by giving proper consideration to the use of grounding, thermal and over current protection, type of enclosure
and good maintenance procedures.
The following information supplements the foregoing safety considerations: This information is not purported to be all-inclusive and the aforementioned references should be
consulted.
1. Do not insert objects into the ventilation openings of products.
2. Sparking of starting switches in AC motors so equipped, and of brushes in commutator type motors, can be expected during normal operation. In addition, open type
enclosures may eject flame in the event of an insulation failure. Therefore, avoid, protect from, or prevent the presence of flammable or combustible materials in the
area of motors/gearmotors.
3. Totally enclosed products are not explosion proof or dust ignition proof nor do we offer such products for hazardous locations (flammable/explosive gas, vapor, dust).
When dealing with hazardous locations, an approved explosion proof or dust ignition proof product is the recommended approach. Exceptions are allowed by the
National Electrical Cod: The NBC and NEMA safety standard should be studied thoroughly before exercising this option.
4. Open, ventilated motors are suitable for clean, dry locations where cooling air is not restricted. Enclosed motors/gearmotors are suitable for dirty, damp locations. For
outdoor use, wash downs, etc., enclosed motors must be protected by a cover while still allowing adequate air flow.
5. Moisture will increase the electrical shock hazard of electrical insulation. Therefore, consideration should be given th the avoidance of (or protection from) liquids in
the area of motors. Use of totally enclosed motors/gearmotors will reduce the hazard if all openings are sealed.
6. Products equipped with thermal protectors are labeled "THERMALLY PROTECTED." If severe over-loading, jamming, or other abnormal operating conditions occur,
such heat sensitive protectors operate to open the electric power supply circuit. Motors/gearmotors with "automatic" thermal protectors MUST NOT be used where
automatic restarting of the drive unit could be hazardous in that clothing or parts of the human body could be in electrical or physical contact with a machine that starts
unexpectedly when the thermal protector cools down. MANUAL RESET protectors or suitable electric supply disconnect devices/procedures should be used where
such hazards could be created.
7. Some oil-type capacitors are identified by means of a Warning Label and, in addition, are stamped "NON-PCB." The user has to provide at least .57 in. (14.5 mm)
clearance beyond the terminal blades for case expansion to allow an internal safety switch to permanently open and electrically disconnect the capacitor. The internal
pressure sensitive switch is designed to prevent the expulsion of the flammable dielectric medium if excessive temperatures are generated by electrical operation. Do
not discard such capacitors into open fire as excessive external heat could cause them to explode.
8. Motors/gearmotors which employ capacitors, can develop more than nameplate voltage across the capacitor and/or capacitor winding (depending on design). Also,
overdrive voltages may be many times greater than a stepper motor's continuous voltage rating. Suitable precautions should be taken when applying such motors.
9. Abnormal conditions such as cut-out switch failure, or a partial winding failure can very occasionally cause some AC motors/gearmotors to start in a direction reverse
from normal. Also, use capacitance or resistance value other than that recommended for Hy-Sync motors may result in unpredictable reverse operation.
Susceptablility to unplanned reversing under such conditions is greatest when the motor's actual load is light relative to it's rated load. One-way clutches or similar
devices are advisable if unexpected reverse rotation is unsafe in the application.
10. Do not rely upon self-locking gears or permanent magnet, stepper, Hy-Sync or energized motors to hold a load in place if movement could result in personal injury.
Mechanical looking devices should be used in such applications.
11. For motors driven by electronic controls, do not use a function of the control for safety interlock purposes. An independent switch or relay should be used. On stepper
motors, the device should be between the control and the motor.