Product information of 5th March 2021
This information only deals with pressure control in AMI Penta and VA Penta as it requires a long explanation. Therefore, it is the only product change you get informed about this time. More information about product changes will follow the coming weeks.
If you need any clarification, you are of course always welcome to contact us.
AMI Penta and VA Penta – Pressure control
Pressure control is a pump controlled by a B&R VLT frequency controller. The user can add up to 2 VLT controllers to the system. All the pressure control settings have been gathered in one place. Common pressure control
Pressure control enabled
No: Disabling pressure control.
Yes: Enabling pressure control. It is required to go to I/O setup and make a config by pressing the button “Make config” to load VLT frequency controller 1 into the system. Pressure pump mode
A: Only VLT 1 is enabled.
A + B: VLT 1 and 2 are enabled. This function is used to run with two pressure pumps in parallel where each pump is controlled with a VLT frequency controller. A “Make config” is required to load VLT controller 2 into the system. Pressure pump 1
Settings in this section affects only VLT 1 controller. Minimum speed
Minimum speed for pressure pump 1. The speed will always be converted to revolutions per minute (rpm) in code behind and be sent to VLT 1 analog output. The minimum speed is independent of the PI regulator which means that the pump always will maintain the minimum speed even if the PI-demand is below that minimum speed. The controller will switch to the PI-demand as soon as the actual speed demand gets over the minimum speed. Start delay
A time delay for starting pressure pump 1. Stop delay
A time delay for stopping pressure pump 1. Pressure pump 2
This section appears when the pressure pump mode is set to A + B. Settings in this section affects only VLT controller 2. Minimum speed
Minimum speed for pressure pump 2. Pressure pump 2 will only start if pump 1 gives a signal to pump 2 to start. This is dependent on the setpoint “Pump 1 speed for start pump 2”. Pump 1 speed for start pump 2
The speed of pressure pump 1 to start pressure pump 2. Start/stop delay
A time delay for starting and stopping pressure pump 2 Start hysteresis
Hysteresis for starting up the pump. Start condition
Time: the start of pressure pump 2 is only dependent on pump 1 speed for start pump 2 and the time delay.
Pressure: The start of pressure pump 2 is dependent on pump 1 speed for start pump 2, a time delay and a pressure input switch. Regulation
Set the integral time for the pressure regulation. P Factor
Set the Proportional factor for the pressure regulation. [bar] Common readings
This reading section is common for both pressure pumps. Pressure
Reading the actual water pressure. Pressure demand
Reading the wanted pressure demand. P Contribution
This is the Contribution from the P regulator. [%] I Contribution
This is the Contribution from the I regulator. [%] Readings
Reading the status of pump 1 and 2 Speed demand
Reading the current pump 1 and 2 speed demand. Pressure fault
Manual fault reset of pump 1 and 2. This can be used if the fault could not be auto reset within the pump alarm delay in the alarm settings. The reset button will only reset the latched fault if the error disappeared physically from the VLT. Alarm status
Off: Indicates that no fault exists on the VLT
On: Indicates that a fault exists on the VLT
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