Chapter 12 Description of Parameter Settings
ļ¼ME300
ļ¦ When the change of feedback value is less than the settings for Pr.12-03 and Pr.12-04, the liquid
leakage occurs. When the system is in constant pressure status, the AC motor drive starts to run
if the feedback value is higher than these two settings.
Example:
If the set point of constant pressure control of a pump is 4 kg, Pr.12-00 is set to 5%, Pr.12-01 is
set to 15 seconds, Pr.12-02 is set to 25%, Pr.12-03 is set to 3% and Pr.12-04 is set to 0.5 seconds,
then the offset is 0.2 kg (4 kgX5%=0.2 kg). It means when the feedback value is higher than 3.8
kg for a time exceeding 15 seconds, the AC motor drive decelerates to stop (this deceleration
time acts according to Pr.01-15). When the feedback value is less than 3.8 kg, the AC motor drive
starts to run.
Status 1:
If the AC motor drive is in the constant pressure status and the feedback change value is less
than 0.12 kg within 0.5 seconds. The AC motor drive does not run until the feedback value
decreases by this proportion to the value less than 3 kg.
Status 2:
When the AC motor drive is in constant pressure, it does not run until the feedback change value
is less than 3.88 kg for a time exceeding 0.5 seconds.
Default: 0
Settings
0ā2
0: Disable
1: Fixed time circulation (alternative operation)
2: Fixed quantity control (multi-pump operating at constant pressure)
ļ¦ When using multi-pump control mode, the setting for Pr.12-05 of each pump must be the same.
ļ¾
Multi-pumpās Fixed Time Circulation Period
Default: 60
Settings 1ā65535 (minute)
ļ¦ Fixed time circulation mode (alternative operation). For example, when pump 01ās operating time
is longer than the setting at Pr.12-07, pump #1 is stopped then pump #2 is activated, so on and
so forth.
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