Mitsubishi Electric F700, Instruction Manual

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237
Special operation and frequency control
4
PA
R
A
M
E
T
E
R
S
(1) Operation
· Set the number of commercial power supply operation motors in Pr. 578 Auxiliary motor operation selection and
motor switching method in
Pr. 579 Motor connection function selection
.
*1 The starting order of motors is M2
o
M3
o
M1 if the last order is M1
o
M2
o
M3. ( Pr. 579 = "1")
*2 The motor status in the order of elapsed time after the last inverter driving completion, from the longest (has not inverter-driven for the longest
time) to the shortest. The motor 1 (M1) starts first when power is turned on for the first time or after reset. (
Pr. 579 = "3")
Pr.579
Setting
Name Description
0 Basic system
The motor to be inverter-driven is always fixed and you can increase/decrease the number of
motors commercial power-driven by turning on and off the MC between the power supply and
motor with the output frequency.
1
Alternative
system
As same as basic system ( Pr. 579 = "0"), the motor to be driven by the inverter is fixed during
operation and you can control the number of motors operated by the commercial power with the
output frequency. When the inverter stops by the sleep function, the MC between the inverter and
motor is switched to switch motors to be inverter-driven.
2 Direct system
When the start signal is entered, the motor is started by the inverter. When the conditions to start the
next motor are established, switching MCs between the inverter and motor and the power supply and
motor will change the inverter driven motor to commercial power-supply operation and start the next
motor by the inverter. Adversely, when conditions to stop the motor is established while multiple motors
are running, motors stop in order of first started motor (in the commercial power-supply operation).
3
Alternative-
direct system
When the start signal is entered, the motor is started by the inverter. When the conditions to start
the next motor are established, switching MCs between the inverter and motor and the power
supply and motor will change the inverter driven motor to commercial power-supply operation and
start the next motor by the inverter. Conversely, when the conditions for stopping the motors are
enabled during running of several motors, the inverter-driven motor is decelerated to s stop and
the motors under commercial power supply operation are switched over to inverter-driven
operation after frequency search.Since frequency search is performed when the motor running
with commercial power-supply is switched to the inverter-driven operation, set a value other than
"9999" in
Pr. 57 Restart coasting time . When Pr. 57 is set, the CS signal need not be turned on.
REMARKS
· The starting order of motors to be driven returns to the initial status at an inverter reset. ( Pr. 579 = "1, 2, 3")
· For Pr. 578 and Pr. 579 , parameter write is disabled during operation. In addition, when the Pr. 578 or Pr. 579 setting has been
changed during stop, the starting order of motors also returns to the initial status.
1) Pr. 579 = 0
2)
Pr. 579
= 1
3) Pr. 579 = 2
4) Pr. 579 = 3
Flow rate Q
Motor 1 (M1)
Motor 2 (M2)
Motor 3 (M3)
Motor 4 (M4)
Motor 1 (M1)
Motor 2 (M2)
Motor 3 (M3)
Motor 4 (M4)
Motor 1 (M1)
Motor 2 (M2)
Motor 3 (M3)
Motor 4 (M4)
Motor 1 (M1)
Motor 2 (M2)
Motor 3 (M3)
Motor 4 (M4)
Time
Time
Inverter operation drive
Commercial power supply
operation drive
Stop
Qmax
Q3
Q2
Q1
*2
*1
*2
*1