Chapter 6 Function Introduction
Shenzhen Hpmont Technology Co., Ltd.
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52
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HD31 Series User Manual V1.1
Ref. Code
Function Description
Setting Range [Default]
P00.06
Pressure tolerance for adding pump
0.0 - 50.0 [10.0%]
P00.07
Detection time for adding pump
0.0 - 3600.0 [5.0s]
P00.08
Upper switch frequency when adding variable frequency pump
P02.27 - upper limit
[50.00Hz]
P00.09
Dec time of variable frequency pump when adding power frequency
pump
0.0 - 100.0 [10.0s]
Conditions for adding pump:
•
○
1 The currently running frequency reaches P02.27 (upper limit of pressure closed-loop)
•
○
2 Pipe system pressure ≤ setting pressure × (1 - P00.09)
•
○
3 Duration of condition
○
1 and
○
2 ≥ P00.07
•
Adding variable frequency pump:
when the system meets the conditions of adding pump and if next
pump is an inverter drive one.
•
The currently running variable frequency pump needs switching to run with power frequency. A
disconnected inverter must comply with P00.13. HD31 needs to accelerate to P00.08, thus to reduce
the network pipe pressure drop and then stops output.
•
Disconnect inverter drive contactor, apply P00.13, and connect the normal drive contactor to complete
the frequency change. At the same time, HD31 controls the next pump to proceed to PI
commissioning.
•
Adding power frequency pump:
when the system meets the conditions of adding pump and if next
pump is a normal drive one.
•
The system automatically starts the next power frequency pump.
•
To avoid a sudden increase in the pipe pressure, the current variable frequency pump decreases its
output frequency to F00.09 according to P00.09, and proceeds to PI conmissioning.
Note:
1. Priority of adding pumps: variable frequency pump > power frequency pump.
2. If there are multiple normal / inverter frequency pumps, the system adds pumps in a circle way according to
"first stop, first resume".
P00.10
Pressure tolerance for reducing pump
0.0 - 50.0 [10.0%]
P00.11
Detection time for reducing pump
0.0 - 3600.0 [5.0s]
P00.12
Acc time of variable frequency pump when reducing pump
0.0 - 100.0 [10.0s]
Conditions for reducing pump:
•
○
1 When the current variable frequency pump operates at the lower limit
•
○
2 Pipe system pressure ≥ setting pressure × (1 + P00.10)
•
○
3 Duration of
○
1 and
○
2 ≥ P00.11
•
Reducing variable frequency pump:
when the system meets the conditions of reducing pump and if the
pump is an inverter drive one.
•
If the current pump is running with power frequency, directly switch the signal; meanwhile, the pump
accelerates to the upper limit according to P00.12, then proceed to PI commissioning;
•
If the current pump is running with variable frequency, there is no need to reduce the pump. The pump
can always run at lower limit frequency.
•
Reducing power frequency pump:
when the system meets the conditions of reducing pump and if the
pump is a normal drive one.
•
Firstly the system disconnects the power frequency signal.
•
At the same time, the pump accelerates to upper limit frequency according to P00.12, then proceed to
PI commissioning.
Note: Reduce the power frequency pump preferentially when there are both inverter & power frequency pumps
which run with power frequency.