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VFD-F Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
5-65
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.
Contactor
Contactor
M1
R S T
U V W
Contactor
Contactor
M2
Contactor
Contactor
M3
Contactor
Contactor
M4
RA2
RB2
RC2
RA1
RB1
RC1
RA5
RC5
RA4
RC4
RA3
RC3
RA8
RC8
RA7
RC7
RA6
RC6
RY00
L N
V
FD-F