Hitachi SJ Series, User Manual

Page: 196 / 786

12-6-1
Chapter 12 Inverter Functions
12.6 Limit frequency and operation
commands.
12.6.1 Limit frequency and operation
commands.
• Want to limit the command range.
• Want to set the lower limit of the frequency
command value to prevent excessively low flow
rate.
• Want to set the upper limit of the frequency
command value for the system.
• A limiter of the upper and lower limits of the
frequency command can be set. The upper limiter
can be set from analogue input by setting [bA101].
• This function limits a frequency command even if a
frequency command value outside the range
between the upper and lower limiters is set.
• When [bA102] is 0.00 Hz and [bA103] is 0.00 Hz,
the corresponding data do not work.
• The upper and lower limiters should be set lower
than the max. frequency. Otherwise, warning of the
inconsistency will arises.
• To set the limiters, set the upper limiter [bA102] first.
Make sure that it is larger than the lower limiter
value [bA103].
• Under the restriction by the upper and lower
limiters and the minimum frequency, a LIM icon
appears.
• To enable the upper limiter, set [bA101]. When
[bA101]=07, the upper limiter is enabled by setting
[bA102] to a value other than 0.00.
Parameters
Item Parameters Data Description
Max.
frequency
For IM
[Hb105]
For SM (PMM)
[Hd105]
10.00~590.00(Hz)
Sets the max. frequency.
IM: Induction motor [AA121]=00-10
SM(PMM): Synchronous motor (permanent magnet
motor) [AA121]=11, 12
Min.
frequency
[Hb130] 0.00~10.00(Hz)
Sets the min. frequency to start output. Disabled
when [AA121]=09, 10.
Selection of
upper limit of
frequency
[bA101] 00~13
00 (disabling)/01 (Ai1 terminal input)/02 (Ai2 terminal
input)/ 03 (Ai3 terminal input)/04 (Ai4 terminal input)/
05 (Ai5 terminal input)/06 (Ai6 terminal input)/ 07
(parameter setting)/08 (RS485)/09 (option 1)/ 10
(option 2)/11 (option 3)/ 12 (pulse string input (main
body))/13 (pulse string input P1-FB)
Frequency
upper limiter
[bA102]
0.00, lower limiter of
frequency -max. frequency
(Hz)
Sets the upper limit of the frequency command.
Disabled when 0.00 is set (for [bA101]=07).
Frequency
lower limiter
[bA103]
0.00, start frequency -upper
limiter of frequency (Hz) Sets the lower limit of the frequency command.
Disabled when 0.00 is set.
Frequency
upper limit
monitor
[dA-14] 0.00~590.00(Hz) The employed upper limit of the frequency is shown.
Limiting a command
Ｑ
Ａ
！
Command input
Frequency command
Upper limiter [dA-14]
Lower limiter [bA103]