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Terminology
Terminology
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Servo OFF
The state in which the motor is free and not controlled and power is
not supplied to the motor.
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Servo ON
The state in which the motor is controlled and power is supplied to
the motor.
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H level
When the digital signal is at high level (5 V for TTL levels).
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L level
When the digital signal is at low level (0 V for TTL levels).
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Rising edge
Where an electric signal shifts from low level to high level.
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Position settling time
The SERVOPACK drives the motor with a pulse train input for
position reference. The position settling time is the time from when
the pulse train input is completed until the positioning error is within
the acceptable range.
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Overload
The state in which the torque integrated over a certain period
exceeds a preset allowable value.
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Momentary power interruption
The state where the supply of voltage to the SERVOPACK turns
OFF momentarily.
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Open collector
An IC with an output collector that is open or a circuit using such an IC.
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Line driver
An IC with a relatively long-distance signal transmission method, or
the circuit using such an IC.
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Momentary power hold time
The maximum time that the voltage of the main circuit can be
maintained without generating an alarm during a momentary
interruption of power.
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Noise countermeasures
A method to prevent or suppress noise that may disturb the signal
lines resulting in malfunctions. Countermeasures should be taken
so that noise is not radiated from the SERVOPACK and so that the
SERVOPACK is not adversely influenced by external noise.
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D-grade grounding
A grounding method with a grounding resistance of 100
Ω
or less.
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Frame ground
Frame ground (FG). Connected to the shield wire of the cable.
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Signal ground
The signal ground (SG) is a signal level of 0 V.
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Forward rotation and reverse rotation
With Yaskawa's AC servomotors, forward rotation is the CCW
direction and reverse rotation is the CW direction as seen from the
load side of the motor.
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Motor with brake
The brake is used while the motor is not rotating. Do not use the
brake to stop the motor during operation. The servo must remain off
while the brake is functioning.
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Centering precision
The mechanical precision between the two shafts of the rotating
machines coupled together. Centering precision usually refers to
the difference in position between the axes of the motor shaft and
the load shaft.
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Allowable thrust load
The maximum allowable load applied parallel to the axis of the
motor shaft.
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Allowable radial load
The maximum allowable load applied vertically to the axis of the
motor shaft.
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Short circuit breaker
A device that automatically shuts off the circuit when the low-
voltage line has a ground fault.
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Magnetic contactor
A magnetic switch that turns power ON and OFF.
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Surge protector
A device that absorbs external voltages, such as lightning surges,
to prevent the malfunctioning and destruction of peripheral
electronic circuits.
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Noise filter
A device installed to prevent external noise from power lines.
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Servomotor size selection software
Software used to select servomotors and SERVOPACKs.
Product name: Ju
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Coupling
A joint that connects the motor shaft and load shaft. The coupling
can absorb differences between the position of the motor shaft and
the load shaft to a certain extent. Couplings are available in metal
disk types, Oldham types, and bellows types. Metal disk couplings
are recommended for the optimum performance of the servomotor
and have good durability.
SERVOPACKs
Servomotors
Peripheral Devices
