Hitachi SJ300 Series - Manual (Page 36)

Chapter 4 – Adjustment
4.3 Adjustment of Speed Response
Optimization of speed response is achieved by adjusting the response to the torque change when the
brake is released. For a typical elevator application, the Motor Speed Proportional Gain Constant (H005)
setting should be in the range of 2.0 to 10.0. If the elevator is slipping at brake release, increase the value
of this parameter. However, settings higher than 2.0 may result in instability such as hunting or vibration of
cables or gears. To avert this, utilize the multi-speed gain function described in Chapter 2, Section 2.3.
This function allows higher gain at the time of brake release and at stopping, while decreasing the gain at
higher speeds. In general, gain should be set higher for frequencies slower than creep. Gain for speeds
higher than creep should be set lower, in the range of 1.0 to 2.0. Abrupt changes of gain may cause shock
to the system. It is preferable to obtain smoother characteristic utilizing the multispeed gain function.
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50 60
Frequency
A
d
ju
st
e
d
G
a
in
v
a
lu
e
(Hz)
（ ％ Example: if H005 = 4.0
Using Multi-Speed Gain
Adjustment Function,
Effective Gain will be
4.0 x 50％＝2.0
Base gain =
H005
Increased gain at
speeds slower
than creep
Note: If you increase the speed response with H005, multi-speed gain adjustment should be utilized
to decrease the value to the range 1.0 to 2.0 for higher speeds.
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