Yaskawa iQpump Controller Programming Manual - Manual (Page 211)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 211
P6 Flow Meter Setup
<0034>
Note: To convert terminal A1 to a 4-20 mA signal, connect a 250 Ohm precision resistor (1/4 Watt or greater) between A1 and
AC. Then program H3-02 = 231.3% and H3-03 = -25.0%.
◆ P6-01 Flow Meter Scaling
Setting Range: 0.0 ~ 6000.0 Gpm
Factory Default: 0.0 Gpm
This parameter allows the connection of an external flow meter to the analog input (Terminal A1).
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Basic Concepts:
• Flow rate monitoring (digital operator)
• Accumulation of flow over time (volume), stored in EEPROM
• Additional method to activate the sleep function
• Additional method to detect a “No Flow” condition
• Uses Terminal A1
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Function Description:
<0034>
Flow Rate: A voltage (current) from a flow meter, which is installed in the pump discharge stream, is connected into terminals A1 and
AC. Terminal A1 will act as a “flow” input only when it isn’t being used as a frequency reference (b1-02 = 1). Parameter P6-01 will then
allow the drive to calculate flow rate from the voltage on Terminal A1. The flow rate will then be scaled and displayed on monitor U1-95.
Units scaling for monitor U1-95 will be determined by parameter P6-02.
Volume Accumulated: The flow data obtained from Terminals A1 and AC, will be integrated over time in order to calculate total fluid
volume. The fluid volume will be displayed in two monitors, U1-96 and U1-97. Parameter P6-03 will reset the volume accumulated data
and return the monitors U1-96 and U1-97 to zero. The maximum value that can be displayed on U1-96 is 65535. The maximum value
that can be displayed on U1-97 is 61036. An internal register tracking volume accumulated has a maximum range of 4 billion
(4,000,000,000) gallons. Accumulated volume will be stored with a resolution of 4 gallons. Accumulated volume will remain at its
maximum value until it is reset, it will not “rollover”.
Note: The accumulated volume will NOT be reset if the drive is initialized (A1-03 = 2220 or 3330).
Figure 1.161
Figure 165. Accumulated Input Flow Calculations
Low Flow Alarm: The flow data obtained from Terminals A1 and AC, will be monitored for a “low flow” condition. If the flow rate
drops below a level set by parameter P6-04, for more than the time specified by P6-05, the drive will display a “LOWFL - Low Flow”
Alarm. The run command must be removed, or the flow rate must remain above the P6-04 for one second to clear the “LOWFL - Low
Flow” Alarm. The Low Flow Alarm is disabled when: the drive is not running, the drive is faulted, or when the frequency reference /
output frequency is at zero Hz. Once the drive starts running, the Low Flow start timer P6-06 time needs to elapse before the Low Flow
Alarm is detected. The Low Flow Alarm is only active when P6-07 = 1.
Low Flow Fault: The flow data obtained from Terminals A1 and AC, will be monitored for a “low flow” condition. If the flow rate drops
below a level set by parameter P6-04, for more than the time specified by P6-05, the drive will fault out on a “LOWFL - Low Flow” Fault
and coast to stop. The Low Flow Fault is disabled when: the drive is not running, the drive is faulted, or when the frequency reference /
output frequency is at zero Hz. Once the drive starts running, the Low Flow start timer P6-06 time needs to elapse before the Low Flow
Fault is detected. The Low Flow Fault is only active when P6-07 = 2 or 3. If P6-07, the Low Flow Fault will NOT be auto-restarted.
How to calculate accumulated flow from the information in monitors U1-96
and U1-97
Step 1: Take the value in monitor U1-97 and multiply by the number 65535.
Step 2: Take the result from step 1 and add it to the value in monitor U1-96.
Example:
U1-96 = 51079
U1-97 = 228
Step 1: 228 x 65,535 = 14,941,980
Step 2: 14,941,980 + 51,079 = 14,993,059
Total accumulated flow = 14,993,059 gallons