LS ELECTRIC SV-iS7 Series, User Manual

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Learning Advanced Features
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8.39.1 Basic MMC Operation
Code Description
APP-01 APP Mode
If “3 (MMC)” is selected for the applied function, the items related to
the MMC function are displayed in the option module function
group (APO) and the functions related to the PID controller are
displayed in APP.
APO-20, 21, 33
If the number of auxiliary motors is set at APO-33 and there is more
than one auxiliary motor, the auxiliary motor number for the first
operation should be APO-21. For example, if there are three
auxiliary motors and each of them is controlled by Relay 1 and 2
and the Q1 terminal, the auxiliary motors operate in the sequence
of Relay 2, Q1, and then Relay 1 when”2” is input at APO-21. The
auxiliary motors stop in the sequence of Relay 1, Q1, and Relay 2. At
APO-20, the number of currently operating auxiliary motors can be
monitored.
APO-23 – 26 Start Freq 1 – 4
Sets the starting frequency for auxiliary motors. Since the main
motor is operated by the PID controller, its operating frequency is
increased by the load change and the operation for an auxiliary
motor becomes necessary. The conditions of the inverter output
terminal I (Relay or multi-function output [Qx]) that turns on for
auxiliary motor operation is as follows. The auxiliary motor can
operate when
• The speed of the main motor exceeds the starting frequency (APO-
23
– 26) of the auxiliary motor.
• The starting delay time (APO-13) of the auxiliary motor passes.
• The difference between the reference and the feedback of the
main motor PID controller becomes smaller than the pressure
difference (APO-40) of the auxiliary motor motion.
APO-27 – 30 Stop Freq 1 – 4
Sets the stop frequency for auxiliary motors. If the operating
frequency for the main motor decreases below a certain frequency
while the auxiliary motor is running, the auxiliary motor should be
stopped. The condition of the auxiliary motor to be stopped is as
follows. The auxiliary motor can be stopped when
• The speed of the main motor decreases below the stop frequency
(APO-27
– 30) for the auxiliary motor.
• The stop delay time (APO-32) for the auxiliary motor passes.
• The difference between the reference and the feedback of the
main motor PID controller becomes larger than the pressure
difference (APO-40) of the auxiliary motor operation.