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11-5 Frequency characteristics
(1)
Overview
This amplifier is capable of measuring the machine resonance point and measuring the frequency
characteristics including load and displaying a board diagram by use of PANATERM(sold separately).
Further, measurement result can be saved in a file.
(2) Caution
The speed of motor drastically changes during measurement. Pay full attention to safety.
In performing measurement, keep the servo ready for turning off if worse comes to the worst.
When it is possible that the machine may break down because of drastic motion of motor, do not use this
function.
[1] If any trouble should occur during measurement of frequency characteristics, cut off power as soon as
possible, or turn off the servo.
[2] Keep the gain as low as possible in measuring.
When frequency characteristics are measured, present position outputs (P1OUT - P32OUT) all turn off.
Homing return operation is required for step operation.
Signals respectively for CW drive prohibition input, CCW drive prohibition input, instantaneous stop,
deceleration stop, and temporary stop are ignored. Be careful.
(3) Setting of measurement condition
Condition
Amplitude
Offset
Sampling rate
A4P
Description
The sum of amplitude and offset is limited within the range not to exceed the
maximum rotation speed.
* When the amplitude is increased, measurement precision improves, but when it
is increased too much, torque is saturated, which lowers the precision on the
contrary. First start from a small amplitude, and increase it little by little as
watching the measurement result.
The sum of amplitude and offset is limited within the range not to exceed the
maximum rotation speed.
* During measurement, the offset setting is the average speed command in
operation.
Polarity is in CCW direction for +, and CW direction for -. When offset is set
above the setting of amplitude to make the motor rotate always in one direction, a
good measurement result can be obtained. However, when movable range is
small, movement may exceed its limit. Be careful. Rotation of motor during
measurement operation can be calculated approximately by the following
equation. Before starting measurement, always make sure that the movement
limit is not exceeded.
Standard of rotation [r] = Offset [r/min] x 0.017 x (Sampling rate + 1)
* When sampling rate is increased, the measurement precision in low frequency
band improves, while measurement takes long. On the contrary, when sampling
rate is decreased, the measurement precision in high frequency band improves.
First start from 1 and adjust the sampling rate as watching the result of
measurement.
MOTOR COMPANY, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
- 114 -
No. SR-DSV09485
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