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11.7.11 Constant level with stop function (3.14)
Settings
The stop function can be set to these values:
•Active
• Not active.
The on/off band can be set to these values:
• ΔH is factory-set to 10 % of the actual setpoint.
• ΔH can be set within the range from 5 % to 30 % of the actual
setpoint.
A built-in low-flow detection function will automatically measure
and store the power consumption at approx. 50 % and 85 % of
the rated speed.
If "Active" is selected, proceed as follows:
1. Close the isolating valve to create a no-flow condition.
2. Press [OK] to start the auto-tuning.
Operating conditions for the stop function
It is only possible to use the constant level stop function if the
system incorporates a level sensor, and all valves can be closed.
Description
The stop function is used for changing between on/off operation
at low flow and continuous operation at high flow.
Fig. 52 Constant level with stop function. Difference between
start and stop levels (ΔH)
Low flow can be detected in two different ways:
1. With the built-in low-flow detection function.
2. With a flow switch connected to a digital input.
1. Low-flow detection function
The built-in low-flow detection is based on the measurement of
speed and power.
When low flow is detected, the pump will stop. When the level has
reached the start level, the pump will start again. If there is still no
flow, the pump will reach the stop level and stop. If there is flow,
the pump will continue operating according to the setpoint.
2. Low-flow detection with flow switch
When the digital input is activated because of low flow, the speed
will be increased until the stop level (actual setpoint - 0.5 x ΔH) is
reached, and the pump will stop. When the level has reached the
start level, the pump will start again. If there is still no flow, the
pump will reach the stop level and stop. If there is flow, the pump
will continue operating according to the setpoint.
11.7.12 Sensor 1 (3.15)
Setting of sensor 1 connected to terminal 54. This is the feedback
sensor.
Select among the following values:
• Sensor output signal:
0-20 mA
4-20 mA.
• Sensor unit of measurement:
bar, mbar, m, kPa, psi, ft, m
3
/h, m
3
/s, l/s, gpm, °C, °F, %.
• Sensor measuring range.
11.7.13 Sensor 2 (3.16)
Setting of sensor 2 connected to an MCB 114 sensor input
module.
Select among the following values:
• Sensor output signal:
0-20 mA
4-20 mA.
• Sensor unit of measurement:
bar, mbar, m, kPa, psi, ft, m
3
/h, m
3
/s, l/s, gpm, °C, °F, %.
• Sensor measuring range:
0-100 %.
TM03 9099 3307
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