Power Transmission Mechanism (Speed Reducers, Belts, and Chains)
If an oil-lubricated gearbox or speed reducer is used in the power transmission mechanism, oil lubrication
will be affected when the motor operates only in the low speed range. The power transmission mechanism
will make noise and experience problems with service life and durability if the motor is operated at a speed
higher than 60 Hz.
If an oil-lubricated gearbox or speed reducer is used in the power transmission mechanism, oil lubrication
will be affected when the motor operates only in the low speed range. The power transmission mechanism
will make noise and experience problems with service life and durability if the motor is operated at a speed
higher than 60 Hz.
Peripheral Device Application Precautions
Using Magnetic Contactors on the Power Supply Line
TheInvertercanbeusedwithoutamagneticcontactoronthepowersupplyline.Althoughamagneticcontactor
can be installed to protect from accidents that can occur by automatic recovery following power losses
during remote operation, do not start and stop operation frequently with a magnetic contactor installed on
the power supply line. Doing so can cause the Inverter to malfunction. The motor will not be automatically
restartedafterpowerrecoveryduringDigitalOperatoroperation,andstartingviaamagneticcontactoristhus
not possible.
Althoughoperationcanbestoppedusingamagneticcontactor in thepowersupplyline, the regenerativecontrol
of the Inverter will not operate and a coast to a stop will occur. If a Braking Unit or Braking Resistor Unit
is used, wire a sequencethat turnsOFFthe magnetic contactor with the thermalprotector contact of theBraking
Resistor Unit.
Using Magnetic Contactors on the Motor Line
As a rule, so not install a magnetic contactor between the Inverter and motor to turn the motorONand OFF
during operation. Supplying power to the motor while the Inverter is operating will cause a large surge current
to flow, and the Inverter’s overcurrent protection function will operate. If a magnetic contactor is
installed to switch to a commercial power supply, switch the lines only after stopping both the Inverter and
the motor. Use the speed search function is switching is required while the motor shaft is rotating.
If a magnetic contactor is required for momentary power losses, use a contactor with delayed operation.
Installing Thermal Overload Relays
The Inverter has a protection function using an electronic thermal to protect the motor from overheating.
However, if more than one motor is operated from one Inverter or if a multi-pole motor is operated, install
thermal overload relays or thermal protectors between the Inverter and motors. Set the constant L1-01 to “0”
and set the heat-operating thermal overload relay or thermal protector to 1.0 times the value on the motor
nameplate at 50 Hz or 1.1 times the value at 60 Hz.
Improving the Power Factor (Eliminating Phase Advancing Capacitors)
Install aDCorACreactor on the power supply line to the Inverter to improve the power factor. (200Vclass
Inverters of 18.5 to 75kW and 400 V class Inverters of 18.5 to 160kW have built-in DC reactors.)
Capacitors or surge suppressorsonthe output line from the Inverter can overheat or be destroyed bythe
highfrequencycomponentof the Inverter’s output.Theycan also cause overcurrents to flow to the Inverter,
causingthe overcurrent protectionfunction to activate.Donot installcapacitors orsurgesuppressorsin
theoutput
line.
Electromagnetic Interference
The Inverter’s I/O circuits (main circuits) contain a high-frequency component, whichmayadversely affect
communications devices (e.g., AM radios) located nearby. This interference can be reduced by installing
noise filters, or you can install the wiring between the Inverter and motor and the power supply wiring in a
metal duct and ground the duct.
Wire Sizes and Distances
Motor torque will be reduced by voltage drop along the cable if the distance between the Inverter and the
motor is too long. This is particularly noticeable for low-frequency outputs. Use wires of sufficient size.
Always use the optional extension cables when operating the Digital Operator separated from the Inverter.
For remote operation using analog signals, keep the control line length between the Analog Operator or operation
signals and the Inverter to 50mor less, and separate the lines from high-power lines (main circuits
or relay sequence circuits) to reduce induction from peripheral devices.
Whensetting frequencies from an external frequency setter (and not from a Digital Operator), used shielded
twisted-pair wires and ground the shield to terminal 12, as shown in the following diagram.
E x t e r n a l
frequency
reference
12 Shield terminal
Speed setting power supply
+15 V 20 mA
Master speed reference
0 to 10 V (20 kΩ)
Master speed reference
4 to 20 mA (250 Ω)
Multi-function analog input
0 to 10 V (20 kΩ)
0 V
Is a registered trademark of yolico
YD3000N
نوﯾﺳﺎﻣوﺗا
ﯽﺗﻌﻧﺻ
ﮏﯾرﺗﮑﻟاوﺑار
قرﺑ
و
