Fuji Electric FRENIC-AQUA series, User Manual

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6.3 Details of Function Codes
6-263
Chap. 6
FUNCTION C
ODES
[ 2 ] PID control action
In the inverter-driven motor floating system (J401 = 2), the following state (1) or (2) is
developed depending on the setting of motor mode selection (J411 to J418).
(1) Driving of all motors are not permitted
When driving of all motors is not permitted (pump control drive motor permission
commands 1 to 8 = OFF ("MEN1" to "MEN8") or the motors are set to disable with
motor mode selection (J411 to J418), PID control will not start because no motors can
control the pump.
(2) All motors are driven by commercial power forcibly
On changing all motors from forced commercial power drive state to enable state ("2
⇒
1" for J411 to J418) with the run command turned ON, motor increase/decrease
judgment will be performed immediately based on the PID control.
J425 Motor Switching Procedure
In pump control, two or more motors are operated while switching them. When increasing or
decreasing the number of operating motors, specify the motors to be driven and the motors to
be stopped in the motor switching procedure (J425). This allows cumulative run time for each
motor to be equalized.
- Data setting range: 0 to 3
Data for J425 Function
0
Fixing procedure
<When the number of motors increases>
The number increases successively in order of increasing the motor number.
(motor 1
⇒
motor 2, motor 3...)
<When the number of motors decreases>
The number decreases successively in order of decreasing the motor number.
(motor 3
⇒
motor 2, motor 1...)
1
Equal operating time (Cumulative run time of each motor is equalized.)
<When the number of motors increases>
Of the motors that are not running, turn on the motor having the shortest
operating time.
<When the number of motors decreases>
Of the motors that are running, turn off the motor having the longest operating
time.
2
Fixing procedure (Switching the motor at slow flowrate stop)
Mode selection is the same when J425 is configured to 0. However, the drive
motor switches to the subsequent motor not only when motors are increased,
but also during slow flowrate stop.
3
Equal operating time (Switching the motor at slow flowrate stop)
The operation is the same as when J425 =1 is selected. However, the drive
motor switches to the motor with least operating time not only when motors
are increased, but also during slow flowrate stop.