Fuji Electric FRENIC-AQUA series, User Manual

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1.1 Features
1-3
Chap. 1
A
bout FRENIC-AQUA
z Boost function
You can set operation frequency, operation time, acceleration time at startup to enable optimal
operation for pump startup.
· Pressurized operation can be executed for a fixed amount of time at startup.
z Deceleration time for check valve protection
If rapidly decelerated, the system valves close quickly, and check valves (piping, pump, valves)
may be damaged by water hammering. To protect the check valve from this, the pump speed is
gradually slowed down when the check valve closes.
z End of curve detection
You can detect large water volume operation status due to incorrect pump capacity selection
(assumed maximum flow required for water supply) from output frequency, output current, flow rate
sensor value and PID deviation.
You can choose whether the inverter will stop operation by alarm or continue to operate while
outputting alarm.
z Control of maximum starts per hour
Detects if start / slow flow rate stop occurs frequently due to failure of the accumulator, etc. You
can choose whether the inverter will stop operation by alarm or continue to operate while
outputting alarm.
z
Anti-jam
If sand or dust were caught in the impeller with a submerged pump and over current protection
function is activated, the motor is rotated in reverse at restart so that the sand and dust are ejected
from the impeller. Then, the motor resumes rotation in forward, allowing water to be supplied in a
normal manner