Fuji Electric FRENIC-AQUA series, User Manual

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6.3 Details of Function Codes
6-221
Chap. 6
FUNCTION C
ODES
* The boost function is canceled when the condition in 1) or 2) below is satisfied.
1) The set operation time (J146) elapses.
2) The cancel PV level (J147, J247) is reached.
• When the run command is OFF (stop), turning BST ON does not cause the boost
function to operate.
• In a case where inverter alarm is generated while the boost function is operating
(J143: data 3/4 selection), the boost function operates at the time of re-initiation
after cancel of the alarm. Similarly, in a case where the boost function is
interrupted for reasons such as run command OFF, free run command ON, and
instantaneous power failure, the boost function operates at the time of
re-initiation. (The boost function is used for re-initiation because air may still
exist in the pipe in a case where avoidance of abnormal pressure increase was
intended.)
Frequency [Hz]
BST input
J144: boost frequency
J146:
boost cancel timer
Transition to PID control
Slow flowrate
Start condition satisfied
BST signals are ignored during boost continuation timer operation
Forcible operation
even if the start
condition is not
satisfied
The boost function
becomes valid only
once until BST signals
are turned OFF.
J146 Boost function cancel example regarding the operation time
J145: boost
acceleration time
Operation time cancel example regarding the boost function with "J1-43 = 1" (BST command is
followed) selected
Frequency [Hz]
BST input
FB signal
J144: boost frequency
Start pressure
Transition to PID control
J147: boost cancel level
Start condition satisfied
Slow flowrate
Acceleration to J144
BST signals are ignored when FB signals are above the boost cancel level.
“
BST
”
= ON during slow
flowrate judgment
J147 Boost function cancel example regarding the PV level
J145: boost
acceleration time
PV cancel example regarding the boost function with "J1-43 = 1" (BST command is followed)
selected