4-294
The setting value of duration of lower limit frequency (24-04) is determined by the changing time speed of
system pressure. The setting value of 24-04 is the fewer the better in the range without producing
oscillation of system pressure.
24- 05
Switching Time of Magnetic Contactor
Range
【0.1 ~ 20.0】Sec
When a motor originally drived by the inverter is switched by the commercial AC power supply or originally
drived by the commercial AC power supply is switched by the inverter, function of parameter 24-05 is used
to avoid the delay of external magnetic contactor resulting in a short circuit of the inverter output and AC
power supply.
The setting value of 24-05 requires being larger than the time from the switch of the inverter Relay signal to
the action of external magnetic contactor. Generally, the off to on time of magnetic contactor is longer than
the on to off time. Set parameter 24-05 depending on the longer time.
Figure 4.4.119 Diagram for the single cycle modes of inverter pump
24- 06
Allowable Bias of Pump Switch
Range
【0.0~20.0】%
When increasing or decreasing pumps with PID control to operate in coordination with Relay card, user
has to determine if it is required to increase or decrease allowable value of pump in the situation of inverter
output frequency being closed to upper limit frequency (00-12) or lower limit frequency (00-13).
The setting unit is 0.1% and if the setting is 0.0%, inverter output frequency needs to reach the upper limit
or lower limit value to increase or decrease pump (motor).
For example, 00-12 = 80%, and 00-13 = 20%, then:
- If 24-06 = 0%, when the output frequency needs to reach 80% of the maximum frequency and the
period of time reach the Duration of Upper Limit Frequency (24-03), the pump (motor)
increase; when the output frequency needs to reach 20% of the minimum frequency and the
period of time reach the Duration of Lower Limit Frequency (24-04), the pump (motor)
decrease.
- If 24-06 = 5%, when the output frequency needs to reach 75% of the maximum frequency and the
period of time reach the Duration of Upper Limit Frequency (24-03), the pump (motor)
increase; when the output frequency needs to reach 25% of the minimum frequency and the
period of time reach the Duration of Lower Limit Frequency (24-04), the pump (motor)
decrease.
24- 07
Pump Control Source Selection
Range
【0】: 1 to 8 Pump Card
【1】: Built-in 1 to 3 Control Mode
24-07 = 0: 1 to 8 Pump Card
It is Relay in the 1 to 8 pump card used for function of inverter pump.
Inverter
IM
MC1
MC2
AC Power Supply
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