6
Precautions for use
This chapter covers restrictions and requirements the user should consider when using the product.
Be sure to match the motor output power with the driver output power.
Wirings
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Connect protective devices to the power line
Connect a circuit breaker or earth leakage breaker to the driver power line to protect the primary circuit.
If an earth leakage breaker is installed, use one incorporating high-frequency noise elimination measures. For selection of the
protective device, refer to the following "Preventing leakage current."
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Noise elimination measures
Provide noise elimination measures to prevent a motor malfunction caused by external noise.
For more eective elimination of noise, use a shielded I/O signal cable or attach ferrite cores if a non-shielded cable is used.
Refer to p.49 for the noise elimination measures.
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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 eect 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 a product oering resistance
against high frequency current like the following:
Mitsubishi Electric Corporation: NV series
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Connecting the motor and driver
Limit the number of times so that attaching/detaching between the connection cable and the motor or driver will not exceed
100 times.
To connect the motor and driver, always use the dedicated connection cable (sold separately). "For BRAKE MOTOR" is
indicated on the connection cable for electromagnetic brake.
Check the operating manual included with the motor for details.
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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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Note on connecting a power supply whose positive terminal is grounded
The USB communication connector on the driver is not electrically insulated. When grounding the positive terminal of the
power supply, do not connect any equipment (PC, etc.) whose negative terminal is grounded. Doing so may cause the driver
and these equipment to short, damaging both.
Installation circumstances
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Grease measures
On rare occasions, grease may ooze out from the gearhead. If there is concern over possible environmental contamination
resulting from the leakage of grease, check for grease stains during regular inspections. Alternatively, install an oil pan or
other device to prevent damage resulting from contamination. Grease leakage may lead to problems in the user’s equipment
or products.
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Caution when using in 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 the overload alarm may generate. However, as time passes, the oil seal or
grease is warmed up, and the motor can be operated without generating the overload alarm.
Operations
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Use an electromagnetic brake motor in an application of vertical drive such as elevating equipment.
When the motor is used in an application of vertical drive such as elevating equipment, use an electromagnetic brake motor
in order to hold a load in position.
When the electromagnetic brake motor is used in an application of vertical drive, although depending on a load condition,
the motor shaft rotation may momentarily reverse (within 90 degrees of the motor output shaft) at the time of starting or
stopping if it is operated under the setting conditions below.
When the set rotation speed is low
When the acceleration time or deceleration time is long
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Do not use a solid-state relay (SSR) to turn on or o the power supply.
A circuit that turns on or o the power supply via a solid-state relay (SSR) may damage the motor and driver.
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If vertical drive (gravitational operation) such as elevating equipment is performed or if sudden start-stop
operation of a large inertia is repeated frequently, use the regeneration resistor (sold separately).
An alarm of overvoltage may be generated depending on the operating condition of the motor. When the alarm of
overvoltage is detected, reconsider the operating condition or connect the regeneration resistor (sold separately).
Refer to p.19 for connection method.
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