7 | Input / Output Description
36 | 44
Pump Control Instructions INVEOR VFD R5 COBRA_EN_en
7.7.3
Stand-by Function in PID Pressure Control (Sleep Mode)
7.7.3.1
Description
This function can provide energy savings in applications such as central vacuum systems where PID
pressure control is used to control to a specific process pressure and the pump has to run at a
“minimum speed” (1.020). As the drive controller can reduce the rotational speed of the pump in
normal operation when the process pressure is decreasing, but it can never fall below the “minimum
speed” (1.020), this provides an opportunity for stopping the motor if it is running speed during a
waiting time, the “PID stand-by time” (3.070) with the “minimum speed” (1.020).
Once the actual value deviates from the target value by the set % value, the “PID stand-by
hysteresis” (3.071), the control (the motor) is started again.
7.7.3.2
Stand-by Function Setup
3.070 PID standby time
If the drive controller runs for the set time at its minimum frequency (parameter 1.020), the motor is
stopped (0 Hz).
Explanation of operating modes / fixed frequency
0 = disable
> 0 = waiting time until stand-by function is enabled
0 = default value to be adapt to your process
3.071 PID stand-by hysteresis
Condition for waking up the PID controller from stand-by.
Once the control difference exceeds the set value as %, the control begins again, see also PID
controller operating modes.
0 = default value to be adapt to your process
