Nastec MIDA 203 Guide

Installation and use manual
MIDA
manMIDA_eng_10

2
Index
1. MIDA Introduction ............................................................................................................................................................ 3
2. Safety Instructions............................................................................................................................................................. 3
3. Technical Characteristics ................................................................................................................................................... 4
3.1 Performance ............................................................................................................................................................................ 4
3.1 Weight and dimensions .......................................................................................................................................................... 4
3.2 Cable entries ............................................................................................................................................................................ 4
4. MIDA installation .............................................................................................................................................................. 5
4.1 Mechanical installation ............................................................................................................................................................ 5
4.2 MIDA Installation for constant pressure control ..................................................................................................................... 7
4.2.1 Pressure tank ................................................................................................................................................................ 7
4.2.2 Pressure sensor............................................................................................................................................................. 7
4.3 MIDA installation for differential constant pressure applications ........................................................................................... 8
4.3.1 Sensors wiring ............................................................................................................................................................... 8
4.3.2 Programming................................................................................................................................................................. 8
5. Electric wiring.................................................................................................................................................................... 9
5.1 Protections............................................................................................................................................................................. 13
5.2 Electromagnetic compliance.................................................................................................................................................. 13
5.3 Installation with long motor cables ....................................................................................................................................... 13
6. MIDA use and programming.............................................................................................................................................14
6.1 Monitoring and programming............................................................................................................................................... 15
6.1.1 Monitoring ................................................................................................................................................................. 15
6.1.2 Programming.............................................................................................................................................................. 16
6.2 COMBO operation.................................................................................................................................................................. 23
7. Protections and alarms.....................................................................................................................................................25

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1. MIDA Introduction
MIDA is a variable frequency drive (inverter) designed to control and protect pumping systems by varying the output
frequency to the pump.
MIDA can be applied to both new and existing pumping systems providing:
energy and cost savings
simplified installation and an overall lower pumping system cost
longer life of the pumping system and relevant components
improved reliability
MIDA, when connected to any pump, manages the system operation to maintain a certain constant physical quantity
(pressure, differential pressure, flow, temperature, etc.) regardless of water demand. The pump is operated only when
needed thus avoiding unnecessary energy consumption.
MIDA at the same time is able to:
protect the motor from overload and dry running
implement soft start and soft stop to increase the system life and reduce current peaks
provide an indication of current consumption, voltage, and power
maintain a record of run time and display any errors and/or failures reported by the system
connect to other MIDA units for combined operation
MIDA can be installed on motor terminal box or fixed on the wall.
In the last case, through the use of output filters it is possible to reduce dangerous surges that are induced in long cables,
making MIDA suitable for control also of submersible pumps.
2. Safety Instructions
The manufacturer strongly suggests carefully reading this operation manual before using and installing its products.
Any operation (installation, maintenance and repair) must be carried out by trained, skilled, and qualified personnel.
Failure to observe and follow the instructions in this manual may result in dangerous and potentially lethal electric shock.
Pay attention to all standard safety and accident prevention regulations.
The device must be connected to main power supply via a switch to ensure the complete
disconnection from the network before any operation on the MIDA itself (including visual
inspection) and/or on the connected load.
Disconnect MIDA from the main power supply before commencing any work.
Do not open the device without having first disconnected the device from the main power supply
and having waited at least 5 minutes.
MIDA and pumping system must be grounded properly before operation.
For the entire period MIDA is powered, high voltage could be present on the output terminals of
the inverter whether or not the pump is running.
Tightening all screws on the cover with washers is recommended before powering the device.
Otherwise, there may be a failure to connect the cover to ground, creating the risk of electric
shock or even death.
Avoid any shock or significant impact during transport.
Check the MIDA immediately upon delivery and check for damage and/or missing parts. If either occurs, immediately notify
the supplier.
Damages due to transport, incorrect installation, or improper use of the device will null and void the warranty.
Tampering or disassembly of any component will automatically void the warranty.
The manufacturer cannot be held responsible for any damages to people and/or property due to improper use of its
products.

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3. Technical Characteristics
3.1 Performance
Model
V in
[V]
Max V out
[V]
I in
[A]
Max I out
[A]
Typical motor P2
[kW]
Size
MIDA 203
1 x 230 +/- 15%
3 x 230
4,5
3
0,55
1
MIDA 205
1 x 230 +/- 15%
3 x 230
7,5
5
1,1
1
MIDA 207
1 x 230 +/- 15%
3 x 230
11
7,5
1,5
1
P.F. line side: 1
Power frequency: 50 - 60 Hz (+/- 2%)
Stocking temperature: -30 to 70 °C (-22 to 158 °F)
Min. ambient temperature at rated current: -10 °C (-14 °F)
Max. ambient temperature at rated current: 40°C (104 °F)
Max. altitude at rated current: 1000 m
Max relative humidity: 95% without condensation
Grade of protection: IP55 (NEMA 4) or motor IP when connected to motor terminal box *
Connectivity: Serial RS 485 for COMBO operation (up to 8 units) + Bluetooth SMART for monitoring and
programming + Modbus RTU.
* Protect the device from direct exposure to sunlight and atmospheric agents
3.2 Weight and dimensions
Model
Weight *
Size
[Kg]
MIDA 203
2,5
1
MIDA 205
2,5
1
MIDA 207
2,5
1
* Weight without packing.
3.3 Cable entries
When MIDA is coupled on motor terminal box, install the cap instead of motor cable gland.
When MIDA is fixed on the wall, install the motor M20 cable gland.
Use the EMC clips to connect the screen of sensors cables to the ground earth.
Model
M20 cable gland
M12 cable gland
EMC clips
MIDA 203
2
3
3
MIDA 205
2
3
3
MIDA 207
2
3
3
SIZE 1

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4. MIDA installation
4.1 Mechanical installation
MIDA on motor
MIDA can be installed directly on motor terminal box in
horizontal or vertical position.
Check with motor manufacturer if it can be operated by
inverter and verify the compatibility of MIDA base with motor
terminal box (see drawing).
The rubber gasket on MIDA base grants the sealing between
MIDA and motor case.
Pierce the rubber gasket only in correspondence of the 4
threaded holes on motor case.
If possible use the same screws and washers which fixed the
terminal box on motor case.
See below instruction how to mount MIDA on motor.
WARNING: after installation check ground earth continuity
between motor case and MIDA.
1
2
3
4

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MIDA on wall
When installed on the wall, keep the protective label on MIDA base in order to grant the ingress protection.
Follow below instructions how to fix MIDA base on the wall.
WARNING: use the provided O-rings with screws in order to grant IP55 protection

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4.2 MIDA Installation for constant pressure control
MIDA controls the pump speed to maintain constant pressure at a set point independent of the water demand in the system.
A basic schematic is shown below:
4.2.1 Pressure tank
Installation of a pressure tank in the hydraulic system is recommended to compensate leakage of water in the system (or
during minimum water demand) and to avoid continuous start/stop cycling of the pump (check the appendix for more
information). Selecting the proper volume and pre-charge pressure of the tank is very important; smaller tank volumes will
not compensate adequately for minimum water usage or leakage, while larger volumes make it more difficult for MIDA to
control the pressure evenly.
Recommended tank volume is equal to the 10% of the maximum water flow of the system (expressed in volume unit/min)
Example: if the max water flow is 50 liters/min, the pressure tank should have a capacity of 5 liters
If the max water flow is 20 gpm, the pressure tank should have a capacity of 2 gallons
Pre-charge pressure of the pressure tank should be at least 80% than the set-pressure of the system.
Example: if the set-pressure of the system is 4 bar, the pre-charge pressure of the tank should be 3.2 bar
If the set-pressure of the system is 60 psi, the pre-charge pressure of the tank should be 48 psi
4.2.2 Pressure sensor
MIDA requires a pressure sensor with a linear output signal within the range 4 –20 mA. The pressure transducer can be
powered by any range of DC Voltage which includes the value 15 V dc.
MIDA accepts the signal of a second pressure sensor in order to:
realize constant differential pressure (AN1 –AN2).
substitute first pressure sensor when it fails
SENSOR 1
AN1: 4-20 mA (-) signal
+15V: 15 Vdc (+) power supply
SENSOR 2
AN2: 4-20 mA (-) signal
+15V: 15 Vdc (+) power supply
MIDA
1
2
3
5
4
1: pump
2: check valve
3: pressure tank
4: valve
5: valve
6: pressure sensor
6

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4.3 MIDA installation for differential constant pressure applications
MIDA can manage the pump speed in order to keep constant the pressure difference between the discharge and suction side
of the pump in circulation systems. To do this, it is usually installed a differential pressure sensor. Alternatively, it is possible
to use two identical pressure sensors: one in suction side and one in discharge side of the pump. The difference of values is
performed by the MIDA itself.
.
N.B. If during the operation it is expected that the pressure in the suction side falls below the atmospheric pressure, it is
necessary to use absolute pressure sensors and not relative ones.
4.3.1 Sensors wiring
MIDA can be connected to linear pressure sensors with 4 - 20 mA output. The supply voltage range of the sensors must
include the 15 VDC with which the MIDA feeds the analog inputs.
If you are using a differential pressure sensor it is necessary to connect the sensor to the analog input 1:
DIFFERENTIAL SENSOR
AN1: 4-20 mA (-) signal
+15V: 15 Vdc (+) supply
In case two pressure sensors are used, the pressure sensor in the discharge side must be connected to the analog input 1
while the pressure sensor in the suction side must be connected to the analog input 2:
SENSOR 1 (discharge)
AN1: 4-20 mA (-) signal
+15V: 15 Vdc (+) supply
SENSOR 2 (suction)
AN2: 4-20 mA (-) signal
+15V: 15 Vdc (+) supply
In the advanced parameters menu it is therefore necessary to set the logic AN1, AN2 as "difference".
4.3.2 Programming
In circulation systems pump starting and stopping is usually controlled by an external contact that can be connected to the
digital input 1 (IN1, 0V) and configured as N.O or N.C in the installer parameters menu. It is then recommended to set the
following parameters:
Installer parameter
Recommended value
Freq. min control
Same as minimum motor frequency
Delta control
0 bar
Delta start
0 bar
Stop delay
99 sec
Advanced parameter
Recommended value
Function AN1,AN2
Difference 1-2
Constant differential pressure
The "set value" corresponds to the differential pressure to be kept constant.
Set the "set value" equal to the pressure difference measured between the discharge and the suction side of the pump at
maximum load (all utilities opened) and at maximum frequency (50 Hz).
Proportional differential pressure
In case it is needed to use a control logic based on proportional differential pressure (in order to achieve a further energy
saving), it is necessary to set the "set value" equal to the pressure difference between the discharge and suction side of the
pump at minimum frequency (20 Hz ) and "compensation" in order to reach the maximum set value at maximum frequency
(50 Hz) and maximum load (all utilities opened).

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5. Electric wiring
MIDA 203,205,207
Power supply
L(L1), N(L2), P.E.
It is recommended to use pre-insulated female faston terminals 6,3x0,8 mm.
In order to respect limits of EN61800-3 Category C1 for irradiated disturbs, it is necessary to add a ferrite on input phases L
and N. The ferrite and cabling instructions are available on request.
Recommended line cables stripping (without ferrite)

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Motor output
U, V, W, P.E.
It is recommended to use pre-insulated female faston terminals 6,3x0,8 mm.
In case the device is mounted on motor terminal box, it is suggested to use PVC wires 200 mm long with cross section 1.5
mm2.
In case the device is mounted on the wall, it is recommended using schielded cables of proper cross section depending on
cable length and motor power. The screen has to be connected to both side.
Follow the below figure for correct cable stripping.
Analog inputs (sensors)
AN1: 4-20 mA, sensor 1
AN2: 4-20 mA, sensor 2
AN3: 0-10 V, external set
AN4: 0-10 V, trimmer for frequency regulation or external set 2
+10
+15
It is recommended to use pre-insulated ferrules.
Use shielded signal cables by placing the screen at one end using the provided EMC clips.
Follow the below figures for correct cable stripping and EMC clip assembling.