3 Precautions for use
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3 Precautions for use
This chapter explains the restrictions and other items you should take heed of when
using the BLH series.
• Do not perform gravitational load operation
With the BLH series, any operation in which the motor output shaft is turned from
the load side (gravitational load operation) will disable the motor speed control. In
addition, a gravitational load operation will cause the driver’s primary inverter
voltage to exceed the allowable value, thereby triggering a protection function and
causing the motor to stop spontaneously. If this happens, there is a possibility that
the load will drop.
• Grease measures
On rare occasions a small amount of grease may leak from the gearhead. If leaked
grease is feared to contaminate the surrounding environment, check for grease
leakage during regular inspections or provide an oil pan or other device to prevent
damage resulting from contamination. Leaking oil is a cause of malfunction in your
equipment or product.
• Apply grease on the output shaft of the hollow shaft flat gearhead
If you are using a gearhead, apply grease (molybdenum disulfide grease, etc.) on the
surface of the load shaft and inner walls of the hollow output shaft to prevent
seizure.
• Conduct the insulation resistance measurement or withstand voltage
test separately on the motor and the driver
Conducting the insulation resistance measurement or withstand voltage test with the
motor and driver connected may result in injury or damage to equipment.
• Noise elimination measures
Provide the following noise elimination measures to prevent a motor or driver
malfunction caused by external noise.
Wiring the motor
To extend the wiring between the motor and driver, use the accessory extension
cable (sold separately).
Wiring the I/O signals cable
• Minimize the wiring length of the I/O signals cable.
• Provide a minimum clearance of 100 mm (4 in.) between the I/O signals cable and
any inductive load such as an electromagnetic relay or any power line (power
supply, motor, etc.). Do not place the I/O signals cable and a power line in the
same duct or pipe or bundle them together.
• For more effective elimination of noise, use a shielded I/O signals cable or attach
ferrite cores if a non-shielded cable is used.
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