Hitachi SJ300-EL Series, Instruction Manual Supplement

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Chapter 2 – Explanation of Functions
2.3 Multi-speed Gain adjustment
Unique ASR (automatic speed regulator) gains (P-gain and I-gain) can be assigned for each output
frequency. The gain of 100% is calculated based on a value of motor inertia (J: H024, H034), speed
response coefficient (H005) and parameters of H070, H071, and H072, adjustable from 0% up to 100%.
Set the frequencies so f1<f2<
xxx
<fn<
xxx
<f7<f8. There is no restriction for the setting of the gains.
Set gain of the maximum frequency (G8 in following figure) is maintained when a higher target frequency is
set.
How to Adjust
Increasing line can also
be set
(f8, G8)
G8 is maintained if output frequency exceeds f8
0
Output frequency
(Hz)
f1 f2 f3 f4 f5 f6 f7
Figure 3 – Multispeed Gain Effect
f8
100%
Gain (%)
Base line (initial setting)
(f1, G1)
G1 is maintained if only f1 is set
(ex) Start point is 0Hz, 100%
(1) The purpose of this function is to get high gain at brake OFF and at stopping, and to have low gain
at higher speed. Therefore increase the gain at a speed that is lower than the creep speed as a
rough initial target.
(2) When using a geared motor decrease H005, H050, H051, H070, H071, and/or H072. Set H005 of
around 1.0-2.0 in the range of lower than the creep speed, as a rough target.
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