Stand-by mode can be activated via parameter
3-4-3-1
. The following information
refers to the figure titled "Time characteristics of parameters for stand-by (sleep)
mode". When the system has reached its steady state (the actual value has reached
the setpoint within the programmed hysteresis for pressure fluctuations (5)),
PumpDrive increases the setpoint by a value of (3) (test pulse) for a period of time (2).
If the flow rate is zero, this pressure compensation will continue to be applied.
PumpDrive reduces the speed to the set minimum output frequency
(3-6-1-2)
. If the
pressure increase continues to be applied for the period of time (7) measured from
the moment at which the speed drops below the minimum speed before stopping
(6), PumpDrive will stop the pump subsequently. PumpDrive remains in stand-by
mode.
If the flow rate consumed rises again, the pressure in the system drops and
PumpDrive starts the pump again after the time delay (8) when the cut-in hysteresis
(4) has been reached.
If the motor speed drops below the value of parameter
3-4-3-4
(6), PumpDrive
switches the pump to stand-by mode after the time delay (7) without carrying out a
test pulse cycle through setpoint compensation (2, 3).
Table 97: Parameters for stand-by mode
Parameter Description
Possible settings
Reference to
Factory setting
3-4-3-1
Enable/disable sleep
mode
Disabled
Enabled
Disabled
3-4-3-2
Difference between
feedback and
setpoint to start
0 - 9999 in physical unit of
setpoint
(3-2-2-1)
0
3-4-3-3
Start delay, sleep
mode
0, 1..60 (s)
1 s
3-4-3-4
Frequency limit to
enter sleep mode
Frequency Low
(3-6-1-2)
to
Frequency High
(3-6-1-3)
[%]
3-11-4-1
60
3-4-3-5
Time delay to stop
the PumpDrive
0, 1..30 (s)
10 s
3-4-3-6
Time delay after
detection of
minimum flow level
45..360 (s)
Access: Service
60 s
3-4-3-7
Difference between
feedback and
setpoint to start test
pulses
0 - 9999 in physical unit of
setpoint
(3-2-2-1)
Access: Service
2
3-4-3-8
Test pulse amplitude 0 - 9999 in physical unit of
setpoint
(3-2-2-1)
Access: Service
2
3-4-3-9
Pulse time
3..30 (s)
Access: Service
10 s
3-2-2-1
Physical unit of
setpoint
10.1 Page 129)
Access: Service
1
3-6-1-2
Lower limit for
motor frequency
0..100 (%)
3-11-4-1
50 %
3-6-1-3
Upper limit for
motor frequency
0..100 (%)
3-11-4-1
100 %
3-11-4-1
Maximum output
frequency
1..70 (Hz)
50 Hz
7.2.5
Fixed speed operation
This function can be used to change the current speed of PumpDrive by specifying a
fixed speed. Two digital inputs are used for this purpose. This function can be
activated in single-pump operation at any time once the digital inputs have been
parameterised and connected. Depending on the connection of the digital inputs,
3 fixed speeds can be selected. The function of the selected digital inputs has to be
set to Pset OutF Bit0 and Pset Out F Bit1.
7 Commissioning/shutdown
90 of 162
PumpDrive
