Fuji Electric FRENIC-HVAC User Manual page 514

J136 PID Multistep Command (Multistep command 1)
J137
J138
Under PID control, a multistep frequency command can be specified as a preset value (3
different frequencies). This command is available under PID control 1 and 2.
• PID command
PID-SS2
OFF
OFF
ON
ON
- Data setting range: -999.00 to 0.00 to 9990.00
J149 Slow Flowrate Stop Function (Mode selection)
J150
J151
J152
J153
J154
J156
J157
J158
J159
J160
The inverter can be stopped when the discharge pressure of the pump rises, causing the
volume of water to decrease. When the discharge pressure has increased, decreasing the
reference frequency (output of the PID processor) below the stop frequency for slow flowrate
level (for PID control 1, J150; for PID control 2, J250) for the period of slow flowrate level
stop latency (for PID control 1, J151; for PID control 2, J251), the inverter decelerates to stop.
However, PID control itself continues to operate. The inverter resumes operation when the
discharge pressure decreases, increasing the reference frequency (output of the PID
processor) above the cancel frequency (for PID control 1, J157; for PID control 2, J257) or
when SV (command value) minus PV (feedback value) exceeds the cancel deviation level
(for PID control 1, J158/J160; for PID control 2, J258/J260).
Specifying J153 (Pressurization starting frequency) and J154 (Pressurizing time) enables
pressurization control when the frequency drops below the level specified by J150 (Stop
frequency for slow flowrate) after the period specified by J151. During the pressurization, the
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 can be specified with a parameter,
pressurization setting suitable for the equipment is possible.
(Multistep command 2)
(Multistep command 3)
PID-SS1
OFF
ON
OFF
ON
(Operation level)
(Elapsed time)
(Auto-operation frequency lower-limit)
(Pressurization starting frequency)
(Pressurizing time)
(Initiation inhibition time)
(Cancel frequency)
(Cancel deviation level 1)
(Cancel delay timer)
(Cancel deviation level 2)
6-204
Command
Command by J102
J136 (Multistep command 1)
J137 (Multistep command 2)
J138 (Multistep command 3)
J249
J250
J251
J256
J257
J258
J259
J260