MHT258a (Engl.)5-14
5.3.3 Speed arrive [NARV]
Check can be done that the motor rotation reaches the reference speed.
This signal turns on when motor speed reaches within setting value of basic para. 51 from the reference speed. The reference speed is the
setting values of basic para. 1 to 7 and the speed command voltage. This signal is effective in speed control and position control (interrupt
positioning). When control is shifted to torque control, the signal on/off status is retained at the point.
This signal will not be turned on for the following conditions:
1) [FWD] signal or [REV] signal is off.
2) Max. speed of basic para. 16 is lower than the reference speed.
3) Acceleration/deceleration time is long and the speed does not reach the reference speed.
■ Interface
■ Parameter setting
To allocate the speed arrive [NARV] signal to the control input terminal, set (25) to the system para. If this signal is not allocated to the
control input terminal, this signal is deemed "always off.”
■ Related items
Basic parameter 51
Para. Name Setting range Initial value Change
51 Speed matching zone (width)
10 to Max. speed [r/min] (in increments of 1)
50 Always
The "speed arrive" signal is turned on when the motor speed is near the reference speed (set by para.) As the initial value is 50[r/min], the
"speed arrive" signal is on when the motor speed reaches the reference speed±50[r/min].
When the motor speed does not reach the reference speed due to the max. speed setting (basic. para. 16) or override setting, this signal
turns off. When [FWD] or [REV] signal is off, the "speed arrive" signal does not turn on.
Basic parameter 16
Para. Name Setting range Initial value Change
16 Maximum speed 0.01 to Max. speed [r/min] (in 0.01 steps) 5000 Always
This parameter specifies the maximum value of motor speed.
If motor speed will exceed the maximum speed by "override", the motor rotates at the specified value.
In torque control, there is some 1000[r/min] difference between the setting value and the motor actual speed because speed control is not
carried out.
The setting of maximum speed is not effective during position control using pulse train input.
Forward command [FWD]
Speed arrive [NARV]
Speed
Time
Speed matching zone (width)
(basic para. 51)
OFF
OFF
ONON
ON
Speed arrive [NARV] (25)
ON : Reaches the reference speed.
OFF : Does not reach the reference speed.
+24V
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