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Manual of Electric Motors
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Unused cable inlet holes in the terminal box must be properly closed to ensure the degree of protection
indicated on the motor nameplate.
The cable inlets used for power supply and control must be fitted with components (for example, cable-
glands and conduits) that meet the applicable standards and regulations in each country.
If the motor is fitted with accessories, such as brakes and forced cooling systems, these devices must
be connected to the power supply according to the information provided on their nameplates and with
special care as indicated above.
Do not apply test voltage above 2.5 V on thermistors and current above 1 mA on RTDs (Pt-100)
according to IEC 60751 standard.
After the motor connection has been completed, ensure that no tool or foreign body has been left inside
the terminal box.
All protection devices, including overcurrent protection, must be set according to the rated machine conditions.
These protection devices must protect the machine against short circuit, phase fault or locked rotor condition.
The motor protection devices must be set according to the applicable standards.
Check the direction of rotation of the motor shaft. If there is no limitation for the use of unidirectional fans, the
shaft rotation direction can be changed by reversing any two of the phase connections. For single-phase motor,
check the connection diagram indicated on the motor nameplate.
Figure 6.14 and Figure 6.15 show the connection diagram of the bimetal thermal protector (thermostats) and
thermistors, respectively.
6.10. CONNECTION OF THE THERMAL PROTECTION DEVICES
If the motor is supplied with temperature monitoring devices, such as, thermostat, thermistors, automatic
thermal protectors, Pt-100 (RTD), etc., they must be connected to the corresponding control devices as
specified on the accessory nameplates. The non-compliance with this procedure may void the product
warranty and cause serious material damages.
Figure 6.14
- Connection of the bimetal thermal protectors (thermostats)
Figure 6.15
- Thermistor connection
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