Fuji Electric FRENIC-HVAC User Manual page 517

 Slow flowrate stop function (Pressurizing time) (J154)
- Data setting range: 0 to 60 (s)
Specifying J153 (Pressurization starting frequency) and J154 (Pressurizing time) enables
pressurization control when the frequency drops below the level specified by J149 (Stop
frequency for slow flowrate) for the period specified by J151. During the pressurization, PID
control is in the hold state.
This function prolongs the stopping time of equipment with a bladder tank by pressurizing
immediately before the frequency drops below the level at which the inverter stops the motor,
thus enabling energy saving operation.
Because the pressurization starting frequency (J153) can be specified with a parameter,
pressurization setting suitable for the equipment is possible.
For pressurization control, see the chart below.
Output frequency
Initiation
frequency
PID output (MV)
Initiation frequency (J157, J257)
Slow flowrate function operation
Frequency level (J150, J250)
Run command
Slow flowrate function halt
signal
PID-STP
 Slow flowrate stop function (Initiation inhibition time) (J156, J256)
Set how long initiation is to be inhibited after stop due to slow flowrate. Set PID control 1 and
PID control 2 with function codes J156 and J256 respectively.
- Data setting range: 0 to 3600 (s)
 Slow flowrate stop function (Cancel frequency) (J157, J257)
Set a cancel frequency. The cancel (start) conditions for slow flowrate level stop are as below.
Set PID control 1 and PID control 2 with function codes J157 and J257 respectively.
- Data setting range: 0.0 to 120.0 (Hz), OFF
When the initiation inhibition time
If one of the conditions below is satisfied, the
function is canceled.
• Operation quantity (MV) ≥ Cancel frequency
(J157, J257)
• SV - PV ≥ Cancel deviation level 1 (J158,
J258)
* MV: operation quantity SV: command value PV: feedback value
J151, J251: slow flowrate
stop elapse time
(J156, J256) elapses
6-207
6.3 Details of Function Codes
J153: pressurization frequency
before slow flowrate stop
J154: pressurization
time before slow
flowrate stop
Hold
ON
When the initiation inhibition time
(J156, J256) does not elapse
• SV - PV ≥ Cancel deviation level 1 (J160,
J260)
t
t
ON