Booster sets
With VASCO – VAriable Speed COntroller inverters is possible to realise booster sets with one or more pumps (up to 8) to be controlled at
constant pressure.
The device can be mounted directly on the motor fan cover with a specific kit. The extreme strength of the connection allows its installation even on horizontal pumps.
Motor mounting application guarantees, as well as the compactness and the saving of additional control panels and wirings, a very good cooling of the inverter and low electromagnetic emissions due to the reduced length of motor cable. IP55 protection allows the installation in humid and dusty environments.
If MIDA cannot be installed on motor fan cover, it is possible to fix the MIDA to the wall with an optional kit composed by a cooling fan fed by the MIDA itself and a wall metal bracket.
IP55 protection does not require to include MIDA drive into any additional control box so MIDA can be installed very near to the pump.
COMBO mode control allows to switch the start of pumps based on real working time and, in case of failure, remaining pumps grant the operation to always guarantee the service.
Once the damaged unit is replaced, COMBO will preferably move the operation on the new pumps to equalize the running time.
From 1 to 8 devices in COMBO connection.
A second way of splitting (named COMBO) consists of using several pumps in parallel (up to 8) each one driven by a device unit.
In this way, efficiency and the reliability of the pump group is maximized.
Each device controls and protects its pump and the operation is shared among all the connected pumps to average pump wearing; in case of failure the remaining pumps will maintain the pumping operation.
From 1 to 8 devices in COMBO connection.
A second way of splitting (named COMBO) consists of using several pumps in parallel (up to 8) each one driven by a device unit.
In this way, efficiency and the reliability of the pump group is maximized.
Each device controls and protects its pump and the operation is shared among all the connected pumps to average pump wearing; in case of failure the remaining pumps will maintain the pumping operation.
From 1 to 8 connection + 1 or 2 DOL pumps.
Additionally it is possible to equip the system with pumps connected in COMBO mode plus 1 or 2 DOL pumps to satis-fy additional water demand.
Submersible pumps
Submersible pumps of various powers can be managed by VASCO – VAriable Speed COntroller.
Sometimes it is necessary to install a filter between pump and inverter to:
-
reduce the spikes on the motor coils caused by voltage reflection (dv/dt filters)
-
avoid electromagnetic noise in the surrounding environment (sinusoidal filters).
It is recommended to keep the motor cable separate from other cables, maintaining a certain distance. Nastec can provide filters and shielded cables for proper pump installation.
Control modes
In addition to constant pressure control, VASCO – VAriable Speed COntroller allows other control modes such as fixed frequency, constant flow, constant temperature.
Constant pressure.
It controls the pump speed to maintain constant pressure at
a set point independent of the water demand in the system.
In a hydraulic system equipped with the device, the standard pressure tank is replaced by a smaller tank which functions to maintain the set pressure in the system when the pump is stopped.
Constant pressure 2 values.
By selecting the constant pressure 2 values control mode, in irrigation systems, only one pump can serve two zones with different pressure sets. It is possible to switch the two values by acting on a digit input contact.
Fixed frequency 2 values.
If it is not necessary to operate at constant pressure but is required to select 2 different pump speeds, by selecting fixed frequency 2 values control mode it is possible to switch the 2 values by acting on a digit input contact.
Constant temperature.
The control method at constant temperature is used to maintain the temperature of the pumped fluid to vary the thermal load. This control system is used in air conditioning or refrigeration and cooling towers. In this latter case, for example, the temperature measured by a sensor in the return water is kept constant.
External frequency.
In some application, it is chosen to change the frequency of the pump by using an external signal coming from a trimmer or a PLC. In this case, after selecting the External Frequency control mode, it is enough to connect an input signal 4-20 mA or 0-10V, proportional to the desired frequency, to the AN4 analogue contact.
.jpg)
Constant flow.
By selecting the constant flow control mode and using a flow transducer, it is possible to control the flow of the pumped liquid to vary the system condition.
This control mode is used, for example, in a system for filtering the pumped fluid in which the obstruction of the filter would lead to a progressive reduction of the flow rate if it is not compensated by an increasing of the pump speed.