Mitsubishi Electric FR-F800, Instruction Manual

Page: 549 / 834

Parameters (A) Application parameters
FR-F800 5 - 387
Multi-pump function control method
Use Pr. 579 "Motor connection function selection" to select the control method for the multi-pump
function. Use Pr. 578 "Auxiliary motor operation selection" to set the number of auxiliary motors.
Pr. 579
setting
Control method Description
0 Basic system
The motor driven by the inverter is always fixed. Commercial power supply
operation of auxiliary motors is available by turning on and off the MC between the
power supply and the motor depending on the output frequency of the inverter.
1 Alternative system
The motor driven by the inverter is fixed during operation. Commercial power
supply operation of auxiliary motors is available by turning on and off the MC
between the power supply and the motor depending on the output frequency of
the inverter.
When output is shut off by the SLEEP function, the MC between the inverter and the
motor is switched to switch the motor to be driven by the inverter.
2 Direct system
When the start signal is turned ON, the motor is started by the inverter. When the
conditions to start the next motor are established, MCs between the inverter and
the motor and the power supply and the motor are switched to change the
operation of the motor driven by the inverter to commercial power supply
operation, and the next motor is started by the inverter.
When conditions to stop motors are established while auxiliary motors are running,
the motor started first (currently driven by the commercial power supply) is stopped
first, and then the other motors are stopped.
3
Alternative direct
system
When the start signal is turned ON, the motor is started by the inverter. When the
conditions to start the next motor are established, MCs between the inverter and
the motor and the power supply and the motor are switched to change the
operation of the motor driven by the inverter to commercial power supply
operation, and the next motor is started by the inverter.
When conditions to stop motors are established while auxiliary motors are running,
the motor driven by the inverter is decelerated to stop, and operation of a motor
currently driven by the commercial power supply is switched to the inverter-driven
operation after frequency search. To perform frequency search when the motor
operation is switched from commercial power supply operation to inverter-driven
operation, set Pr. 57 "Restart coasting time"
≠
"9999".
Tab. 5-193: Settings of Pr. 579