Multi-Speed Gain Adjustment - Hitachi SJ300-EL Series Instruction Manual Supplement

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< <fn< <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.
Gain (%)
100%
(f1, G1)
0 f1
How to Adjust
(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.
(ex) Start point is 0Hz, 100%
G1 is maintained if only f1 is set
Increasing line can also
be set
Figure 3 – Multispeed Gain Effect
f2 f3 f4
Chapter 2 – Explanation of Functions
Base line (initial setting)
G8 is maintained if output frequency exceeds f8
f5 f6 f7
13
(f8, G8)
f8
Output frequency
(Hz)