Specifications
59
Applications Examples
Pumps
（Ease of Automatic Control Insures Performance Consistancy）
Machine
Operating Panel
Power
Supply
Frequency
Reference
Value
Pump
Flow Switch
Pressure
Detector
Feeding
Water
（Detected Value）
PID Control/Manual Control
R/L1
S/L2
T/L3
PID
U/T1
V/T2
W/T3
Target Value/Frequency
Reference Value
Varispeed G7
M
Motor
Varispeed G7
Motor
IM
F
U/T1
V/T2
W/T3
FM
AC
M1
M2
R/L1
S1
S7
SC
＋V
A1
AC
A2
4 to 20 mA
MCCB
S/L2
T/L3
R
S
T
Digital
Operator
Analog
Monitor
Frequency
Reference
Value
PID
Frequency
Meter
Running
Power
Supply
（Target Setting）
（Detected Value）
（Detected Value）
Sensor
Run/Stop
PID Control Cancel
(Target Value)
User
,
s Requirements
PID control cancel
H1-01 to 10＝19
Feedback signal
4 to 20 mA
Terminal A2 signal level selection
H3-08＝2
Terminal A2 function selection
H3-09＝B
Analog monitor selection
H4-01，04＝1 to 38
Meter indication of
motor current or
output frequency
PID control
PID control
characteristics
adjustment
PID control selection
b5-01＝
1
or 2
PID adjustment b5-02 to 10
Function and Parameter Settings
Note: Be sure to set the PID feedback signal at terminal A2 or RP.
Application User
,
s Requirements
Applicable Varispeed G7 Function
Function and Parameter Settings
General Pump
Chemical-
Feeding
Pump
Warm/Cold
Water
Circulation
Pump
Discharge
Pump
Easy automatic control
Save energy since the load is not
heavy at low-speed operation.
Ammeter for monitoring load
conditions.
Function that can keep the system
working without resetting it even
when a momentary power loss occurs.
Keep a constant water level inside a
tank using a water gauge.
Keep the motor min
-1
above the
minimum because if the min
-1
is too low,
water flows in the reverse direction.
Run the system using the commercial power supply
when an emergency occurs, then return to inverter.
Drive the pump directly using
4-20 mA signal.
Function to maintain minimum speed.
Keep the mixed water ratio constant.
Use PID function inside the inverter.
(External PID control is not required.)
Use an analog monitor
(2 CN provided as standard)
Use a selector circuit together with the speed
search function to restart turning motor.
Use the continuous operation function to
restart after momentary power loss within two
seconds. Use a toggle switch for start and stop.
Use external terminals A2 and AC.
Use the lower-limit of the reference frequency.
Control the water level by PID control.
Use the lower-limit of the frequency
reference.
Available with standard function
(open loop vector control)
PID adjustment b5-01 to 11
Control method selection A1-02＝2
Output selection function H4-01，04＝2，3
Run signal selection b1-01，02＝1
Frequency reference lower limit d2-02＝0 to 110 ％
Speed search function selection b3-01
＝
1 or 3
Momentary power loss protection L2-01＝0 to 2
PID control b5-01 to 11 setting
Frequency reference lower limit
d2-02＝0 to 110 ％
Use PID output (4 to 20mA) as the
feedback signal.
Cancel PID control.
Terminal A2 signal selection
H1-01 to 10＝19
H3-08＝2
H3-09＝B
Master/Aux. switching
PID control enable/disable
Use signals (4 to 20mA) sent from the water-
level adjusting unit as the feedback signal.
H3-08＝2
H3-09＝B
Terminal A2 signal selection
Block Diagram of Feed Water Pump Application