General recommendations

<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> It is mandatory to start the cooling system before starting the motor.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> The temperature and flow rate of the water in the circuit, must be checked in order to avoid any damage.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> It is necessary to stop the cooling fluid 5 minutes after the motor is stopped.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> If the liquid flow rate is zero, the motor could be damaged, creating problems and damage to what is in close proximity.

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Cooling circuit connection

The SMAC 200 and SMAC 270 series motors are designed with the liquid cooled option and equipped with following connectors:

<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> Make sure to install an appropriate pump to ensure a flow of the refrigerant fluid, sufficient to guarantee and respect the values indicated in the following tables.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> Depending on the application, the motor control inverter can be air-cooled or liquid-cooled.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> In the last case, the controller can have a separate cooling circuit or can be included in the motor cooling circuit.

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/1dba5681-eda7-4172-9f34-758e7d1dd37d/general-warning-sign_hires.png" width="40px" /> For the correct use of the cooling system, the circuit must be completely free of residues. Therefore, make sure that the cooling circuit is not blocked before its connection and / or connection.

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Motor performance

The motor curves (MDS) are simulated under the following conditions:

Note: a different liquid will generate a lower cooling capacity. The motor performance will change depending on the specific liquid used.

Liquid Temperature, Pressure and Flow

The motor performances are related to the flow and temperature of the liquid. It is necessary to use a pump with a correct size for the right flow value.

The liquid system (chiller) needs to be chosen in order to reach a right cooling of the liquid at the right pressure and flow

See the following steps for the right chiller selection:

1. Define the Mechanical Power (Pm) related to the specific application.
2. Use the Motor Curve (MDS) to define the motor performance η (efficiency map).
3. Define the Power Adsorbed Pa = Pm / η (W).
4. Define the Dissipated Power Pd = Pa – Pm (W).

The Dissipated Power Pd is the power that the chiller needs to be able to extract.

The liquid inner temperature (Tliq.) needs to be chosen in order to avoid the condensation on the external surface of the motor casing:

T liq. > T amb. – 5°C

See the following values for different motors dimension: