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(23) Frequency Command Upper-Bound Delay Time (Bn-23)
•
The 1-8 PID Relay option card application parameter, if the AC drive’s PID output frequency
exceeds the frequency command upper bound (the Cn-14 set value), the relay output on 1-8 PID
Relay card will activate to increase the number of running pumps when the delay time set by
Bn-23 has expired.
• The set value of Bn-23 depends on the pressure response of the water supply system. The set value
should be set as low as possible to prevent mechanical shock and vibration.
(24) Frequency Command Lower-Bound Delay Time (Bn-24)
• The 1-8 PID Relay option card application parameter, if the AC drive’s PID output frequency
drops below the frequency command lower boundry (the Cn-15 set value), the relay output on
1-8 PID Relay card will activate to decrease the number of running pumps when the delay time set
by Bn-24 has expired.
• The set value of Bn-24 depends on the pressure response of water supply system. The set value
should be set as low as possible to prevent mechanical shock and vibration.
Please refer to “1-8 PID Relay Card instruction manual”.
(25) MC ON/OFF Delay Time (Bn-25)
• The1-8 PID Relay option card application parameter. Please refer to “1-8 PID Relay Card
instruction manual.”
• When switching one inverter-driven motor (or pump) to AC line power source or vice versa, set
the MC ON/OFF delay time (set value of Bn-25) to avoid the drive output and AC line source
being short-circuited due to the possible varying delay times of MC1 and MC2.
• The delay time (Bn-25 set value) must be longer than the time of the MC ON/OFF controlled
signal output from AC drive until the external MC operation is established.
•
Generally, the MC operation time from OFF to ON is longer than ON to OFF time. Therefore,
set the delay time according to the OFF to ON time.
(26) Pump ON/OFF Detection Level (Bn-26)
• The 1-8-PID Relay option card application parameter. Please refer to “1-8-PID Relay Card
instruction manual”.
• The set value of Bn-26 is the deviation level of PID set point and feedback values when
using 1-8-PID Relay option card to increase or reduce the number of running pumps.
• Set the pump ON/OFF detection level in units of 0.1%. If the value is set to 0.0%, when the output
frequency reaches the frequency upper boundry (the set value of Cn-14) the number of running
pumps increases immediately. When output frequency drops to the frequency lower boundry
(the set value of Cn-15) the number of running pumps decreases immediately.
2-9
PA 7300
PART II: OPERATION MANUAL
Inverter
IM
MC1
MC2
AC power source
Содержание PA7300 Series
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