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Control mode: The system has two control modes, manual and automatic, namely industrial frequency and variable frequency. Select either Pump No. 1 or Pump No. 2 to be put into operation through the conversion switch. When manual control is selected, the pump motor can be started and stopped directly. Manual operation also has an automatic operation function. When the pressure is higher than the upper limit pressure set by the electrical contact pressure gauge, the system will automatically shut down. When the pressure is lower than the lower limit pressure set by the electrical contact pressure gauge, the system will automatically start. The system has an overheat protection function. When choosing automatic control, the control is jointly accomplished by the frequency converter and the remote pressure gauge. The system pressure can be set at any time. When the actual pressure is lower than the set pressure, the frequency converter automatically adjusts the output frequency to accelerate the motor. When it reaches the vicinity of the set pressure value, the motor automatically gradually decelerates to keep the system pressure stable around the set value. The system has a sleep function. When no one uses water outside and the sleep delay time is exceeded, the frequency of the frequency converter will automatically set to 0HZ. When the system pressure is lower than the sleep wake-up pressure, the system will automatically start to meet the on-site living needs. The system has status indications during operation.

The constant pressure water supply parameters of the NZ200 series are as follows:
Start at terminal P0.02--1
P0.04-8 / PID
PA.01-- Pressure given
PA.02--1/FIC feedback
PA.04- Pressure gauge range
PA.08--0/PID cut-off frequency
PA.28--1/PID shutdown operation
C9.00- 27/ sleep frequency
C9.01--60/ dormancy duration
C9.02--95/ hibernation wake-up value