Yaskawa Z1000U - Manual (Page 19)

NOTICE: To get the full performance life out of the capacitor for the control power supply and circuit relays, refrain from switching the drive
power supply off and on more than once every 30 minutes. Frequent use can damage the drive. Use the drive to stop and start the motor.
Inspection and Maintenance
WARNING! Electrical Shock Hazard. Capacitors for the control power supply do not immediately discharge after shutting off the power.
Wait for at least the amount of time specified on the drive before touching any components after shutting off the power. Failure to comply
may cause injury to personnel from electrical shock.
WARNING! Electrical Shock Hazard. When a drive is running a PM motor, voltage continues to be generated at the motor terminals after
the drive is shut off while the motor coasts to stop. Take the precautions described below to prevent shock and injury:
∙ In applications where the machine can still rotate after the drive has fully stopped a load, install a switch to the drive output side to disconnect
the motor and the drive.
∙ Do not allow an external force to rotate the motor beyond the maximum allowable speed or to rotate the motor when the drive has been
shut off.
∙ Wait for at least the time specified on the warning label after opening the load switch on the output side before inspecting the drive or
performing any maintenance.
∙ 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.
WARNING! Burn Hazard. Because the heatsink can get very hot during operation, take proper precautions to prevent burns. When replacing
the cooling fan, shut off the power and wait at least 15 minutes to be sure that the heatsink has cooled down. Failure to comply may cause
burn injury to personnel.
Wiring
All wire ends should use ring terminals 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.
u Motor Application Precautions
n Standard Induction Motors
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 decreases 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. Figure i.1 shows the allowable load characteristics for a
Yaskawa standard motor. Use a motor designed specifically for operation with a drive when 100% continuous torque is needed
at low speeds.
50
3 6 60
60
70
80
90
100
25% ED (or 15 min)
40% ED (or 20 min)
60% ED (or 40 min)
Frequency (Hz)
Continuous operation
Torque
(%)
20
Figure i.1 Allowable Load Characteristics for a Yaskawa Motor
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.
High-Speed Operation
NOTICE: Problems may occur with the motor bearings and dynamic balance of the machine when operating a motor beyond its rated speed.
Contact the motor or machine manufacturer.
i.2 General Safety
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 19