8 Appendix
MAGNETEK HPV1000 AC Elevator Drive Technical Manual 79
• Do not open and close the load switch while the motor is running.
• If the motor is coasting, make sure the power to the drive is turned on and the drive output has completely stopped
before closing the load switch to reconnect the drive to the motor.
Wiring
Magnetek recommends using ring terminals on all drive models for UL/cUL compliance. Use only the tools
recommended by the terminal manufacturer for crimping.
Transporting the Drive
NOTICE: Never steam clean the drive. During transport, keep the drive from coming into contact with salts, fluorine, bromine,
phthalate ester, and other such harmful chemicals. Failure to comply may damage the drive.
Motor Application Precautions
Standard Induction Motors
Insulation Tolerance
NOTICE: Consider motor voltage tolerance levels and motor insulation in applications with an input voltage of over 440 V or
particularly long wiring distances.
NOTICE: Ensure that the motor is suitable for inverter duty and/or the motor service factor is adequate to accommodate the additional
heating with the intended operating conditions. A motor connected to a PWM drive may operate at a higher temperature than a
utility-fed motor and the operating speed range may reduce motor cooling capacity.
High-Speed Operation
Mechanical damage may occur with the motor bearings and dynamic balance of the machine when operating a motor
beyond its rated speed. Operate the motor within specifications to prevent motor damage.
Low-Speed Range
The cooling fan of a standard motor should sufficiently cool the motor at the rated speed. As the self-cooling capability
of such a motor reduces with the speed, applying full torque at low speed will possibly damage the motor. Reduce the
load torque as the motor slows to prevent motor damage from overheat. Use a motor designed specifically for operation
with a drive when 100% continuous torque is needed at low speeds.
Torque Characteristics
Torque characteristics differ compared to operating the motor directly from line power. The user should have a full
understanding of the load torque characteristics for the application.
Vibration and Shock
The drive allows selection of high carrier PWM control and low carrier PWM control. Selecting high carrier PWM can
help reduce motor oscillation.
If resonance occurs, install shock-absorbing rubber mounts around the base of the motor and utilize the Jump frequency
selection to prevent continuous operation in the resonant frequency ranges.
Audible Noise
Noise created during run varies by the carrier frequency setting. When using a high carrier frequency, audible noise from
the motor is comparable to the motor noise generated when running from line power. Operating above the rated r/min,
however, can create unpleasant motor noise.
Precautions for PM Motors
NOTICE: Damage to Equipment. Improper sequencing of output motor circuits could result in damage to the drive. Do not connect
electromagnetic switches or magnetic contactors to the output motor circuits without proper sequencing. Do not open the main circuit
between the drive and the motor while the PM motor is rotating.
• Contact Magnetek or your Magnetek agent if you plan to use any PM motor not endorsed by Magnetek.
• When using a holding brake, release the brake prior to starting the motor. Failure to set the proper timing
can result in speed loss.
WARNING! Sudden Movement Hazard. Use a logic output to interlock the brake to ensure the brake is not released before the Initial
Magnetic Pole Search is completed. Failure to comply may cause inadvertent elevator movement resulting in serious injury.
This safety message is applicable under these conditions:
• When applying a PM motor, with an external brake sequence, and the PG-F3 option is not being used.
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