Precautions for use
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2 Precautions for use
This chapter covers limitations and requirements the user should consider when using the product.
Be sure to match the motor output power with the driver output power.
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Connect protective devices to the power line
Connect a circuit breaker or earth leakage breaker to the driver’s power line to protect the primary circuit. If an
earth leakage breaker is to be installed, use one incorporating high-frequency noise elimination measures. Refer to
"Preventing leakage current" below for the selection of protective devices.
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Do not perform vertical drive (gravitational operation)
The product will not be able to control the motor speed if an operation that the motor output shaft is externally rotated
is performed (vertical drive etc.). Also, if vertical drive is performed, since the inverter primary voltage of the circuit
may exceed the permissible range, the protective function may be activated. As a result, the motor may coast to a stop
and the load may fall.
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Do not use a solid-state relay (SSR) to turn on/off the power
A circuit that turns on/off the power via a solid-state relay (SSR) may damage the motor and driver.
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Do not conduct the insulation resistance measurement or dielectric strength test with the motor
and driver connected
Conducting the insulation resistance measurement or dielectric strength test with the motor and driver connected may
result in damage to the product.
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Grease measures
On rare occasions, grease may ooze out from the gearhead. If there is concern over possible environmental damage
resulting from the leakage of grease, check for grease stains during regular inspections. Alternatively, install an
oil pan or other device to prevent leakage from causing further damage. Oil leakage may lead to problems in the
customer’s equipment or products.
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Caution when using under low temperature environment
When an ambient temperature is low, since the load torque may increase by the oil seal or viscosity increment of
grease used in the gearhead, the output torque may decrease or an overload alarm may generate. However, as time
passes, the oil seal or grease is warmed up, and the motor can be driven without generating an overload alarm.
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Preventing leakage current
Stray capacitance exists between the driver’s current-carrying line and other current-carrying lines, the earth and the
motor, respectively. A high-frequency current may leak out through such capacitance, having a detrimental effect on
the surrounding equipment. The actual leakage current depends on the driver’s switching frequency, the length of
wiring between the driver and motor, and so on. When connecting an earth leakage breaker, use one of the following
products offering resistance against high frequency current:
[ Mitsubishi Electric Corporation: NV series ]
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Noise elimination measures
Provide noise elimination measures to prevent a motor or driver malfunction caused by external noise. For more
effective elimination of noise, use a shielded I/O signal cable or attach ferrite cores if a non-shielded cable is used.
Refer to p.40 for the noise elimination measures.
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Connecting the motor and driver
Be sure to connect the connector type motor and the driver using the dedicated connection cable (sold separately).
The maximum distance between the motor and driver is 10.5 m (34.4 ft.), and the connection cables are provided up
to 10 m (32.8 ft.). Limit the number of times so that attaching/detaching between the connection cable and the motor
or driver will not exceed 100 times.
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Connection cable
Do not apply a strong force on the locking lever of the connector for motor connection.
Applying a strong force on the locking lever may cause damage.
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The driver uses semiconductor elements, so be extremely careful when handling them
Electrostatic discharge can damage the driver.
Be sure to ground the motor and driver to prevent them from being damaged by electric shock or static electricity.
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Saving data to the non-volatile memory
The display blinks while pressing the setting dial to set the data or initializing the data (about 5 seconds). Do not turn
off the power supply while the display is blinking. Doing so may abort writing the data and cause an EEPROM error
alarm to generate. The non-volatile memory can be rewritten approximately 100,000 times.
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