TECO-Westinghouse F510 Series, Instruction Manual

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The following examples are for the actions of increasing / decreasing pumps in 1 to 3 Relay modes. Relay
1~Relay 3 is corresponding to R1A-R3A. Refer to Fig.4.4.118 for switching of the motor connected to the
inverter or AC power supply. MC of AC power supply is mainly controlled by the external circuit control.
Refer to Fig.4.4.128.
When 24-00=1, 24-06=0 and depending on the above PID setting, the following status occurs.

Output frequency (Fout) reaches the upper limit frequency (00-12) and Fout time is over than the
duration of upper limit frequency (24-03). Then Relay 1 is power off and output frequency of the
inverter does not occur.

Relay 2 is power on and output frequency of the inverter does not still occur after the switching time
of MC (24-05) ends.

Relay 1 is power on and the inverter starts to accelerate after the switching time of MC (24-05) ends.
Fout
Motor 1
Motor 2
Start
Relay 1
Relay 2
Motor 1 AC Power Supply
Relay 3
Motor 2 Inverter
Motor 2 AC Power Supply
Motor 3 AC Power Supply
Motor 1 Frequency
Motor 3 Frequency
Motor 2 Frequency
Inverter
AC Power
Supply
AC Power
Supply
Motor 3
T1
Motor 1 Inverter
Motor 3 Inverter
T1 T2 T1
00-12
Inverter
Inverter
Figure 4.4.124 Diagram of increasing pump in 1 to 3 Relay modes
T1 = 24-05 Switching Time of
Magnetic Contactor
(MC)
T2 = 24-03 Duration of Upper Limit
Frequency