EM15 Series water supply application reference

Issuing time:2024-12-10 11:03

Code	Function description	Default	Setting value	Remark
b0-02	Command source selection	0	0	0.board control 1.external terminal control
b0-03	Main frequency resource selection	1	8	PID control
C0-00	PID setting source	0	7	C3 group pressure control
C0-03	PID feedback source	0		The remote pressure gauge set to 0，the pressure transmitter set to 1.
C3-00	Target pressure setting	0.200	Adjust according to the applications	Unit：MPa
C3-01	the maximum value of feedback pressure	1.000
C3-03	The protect pressure of explosion-proof pipe	1.500
C3-04	Wakeup pressure	80.0%		Eg：Target pressure is 0.5MPa，wakeup pressure is 0.5MPa*80%=0.4MPa.
C3-07	Sleeping frequency	20.00HZ		This value setting set to 1 or 2HZ more than the value there is no one to open faucet of water pipe.

The main features ofinverter for constant pressure water supply system:

l When the demand of the water supply changed, the outlet pressure keepsunchanged, and the output pressure value is according to the user’s demand.

l It can save 10%~40% electricity and achieve green electricity use.

l It can be automatic, save manpower and resources, low cost and highefficiency.

l Due to the frequency inverter ‘stable speed control, the watersupply from the headwaters, compared with the water supply before, it willreduce the second pollution.

l Reasonable operation, soft start and soft stop can not only eliminatewater hammer effect，but reduce the average torque and abrasion of the motor, the repairtimes and cost, and increase the working life of water pump.

The mainapplications of inverter for constant pressure water supply:

l Domestic water of high buildings, urban and rural residentialquarter, company and etc.

l All kinds of industrial use water, cooling water circulation, the boilerfilling water and etc.

l Central air-conditioning system.

l Water plant pressurization system.

l Farm irrigation, water treatment, and fountain.

l All kinds of fluid constant pressure systems.

System debugging:

l Debugging mainly includes the following technical points:

l Make sure the feedback source and realize closed-loop PID control.

l Adjust the PID parameter value; so that the pipe network pressure isstable. The fluctuation is small.

l Input the basic inverter parameters, frequency setting mode,acceleration and deceleration time, etc.

l Input feedback signal source 0-10v, 4-20mA, observe its range byparameters, and calibrate the parameters by group C0/C3.

Inverter displayinterface description:

After setting the parameters, the keypad upperline shows the feedback pressure by default, which can be automaticallyrestored to the frequency interface by adjusting the upper and lower buttons.(asthe following pictures)

Wiring diagramreference：

Parametersetting sheet：(Generally use following parameters)

Function code	Function description	Default	Setting value	Remark
b0-02	Command source selection	0	0	0.board control 1.external terminal control
b0-03	Main frequency resource selection	1	8	PID control
C0-00	PID setting source	0	7	C3 group pressure control
C0-03	PID feedback source	0		The remote pressure gauge set to 0，the pressure transmitter set to 1.
C3-00	Target pressure setting	0.200	Adjust according to the applications	Unit：MPa
C3-01	the maximum value of feedback pressure	1.000
C3-03	The protect pressure of explosion-proof pipe	1.500
C3-04	Wakeup pressure	80.0%		Eg：Target pressure is 0.5MPa，wakeup pressure is 0.5MPa*80%=0.4MPa.
C3-07	Sleeping frequency	20.00HZ		This value setting set to 1 or 2HZ more than the value there is no one to open faucet of water pipe.

If it don’t need sleeping mode,please set C3-04 =100,C3-07=0.

Theapplication parameters optimization:（the following parameters setting is accordingto the application demand，don’t set if there is no specialdemand.）

b0-21	Acceleration time	0-650s	It will be benefit to the system performance if set suitable acceleration and deceleration time
b0-22	Deceleration time	0-650s
C0-06	The proportional gain Kp1	20.0	The value larger, the adjustment stronger
C0-07	The Integral time Ti1	0.8	The value smaller, the adjustment faster
C0-16	PID initial	0.0	Fixed PID value output at startup
C0-17	PID initial holding time	0.00s	Fixed output frequency holding time at startup
C0-25	Detection value of PID feedback loss	0.0%	These parameters are used to judge whether the PID feedback is lost. If the PID feedback is smaller than the value of C0-25, and the lasting time is exceeds the value of C0-26, the inverter will report Err31.(The default setting is 0.0s)
C0-26	Detection time of PID feedback loss	0.0s

l Thelarger C0-06 value, the system is more sensitive and the reaction will befaster. But the system reaction need some time, so too bigger value will causesystem over adjustment and vibration.

l Thesmaller C0-07 value, the reaction of system will be faster. But the systemreaction need some time, so too smaller value will cause system over adjustmentand vibration.

l SettingC0-23, C0-24 value too big, that will causes slowly system reaction.

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