Delta Electronics AC Drive VFD-F Series User Manual page 98

When Pr. 11-01 is set to 02 "Fixed Amount Circulation" and adding relay card "RY-00",
VFD-F is able to drive 4 motors under PID control mode by turns.
System powers up, VFD-F drives 1st motor as PID control mode. If VFD-F output frequency
continually surpasses 11-06 frequency setting and 11-05 time period, after time lag of
11-04, VFD-F will switch 1st motor power supply to commercial power and energize 2nd
motor. At this time, 1st motor is full power running and 2nd motor is running PID control
mode by VFD-F.
Previous routine repeats to 2nd motor→3rd motor→4th motor till VFD-F reaches proper
PID values. VFD-F only runs PID control mode to last motor, others run full power.
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VFD-F
RY00
L N R S T
Contactor
Contactor
Contactor
Contactor
Contactor
Contactor
Contactor
Contactor
5-65
VFD-F Series
M1
M2
M3
M4
5