Connection Of The Space Heaters; Starting Methods - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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Figure 6.17 - Ohmic resistance of the Pt-100 x temperature

6.12. CONNECTION OF THE SPACE HEATERS

Before switching ON the space heaters, check if the space heaters connection have been made according to
the connection diagram shown on the space heater nameplate. For motors supplied with dual voltage space
heaters (110-127/220-240 V), see Figure 6.18.
Figura 6.18 - Dual voltage space heater connection.
The space heaters should never be energized when the motor is in operation.

6.13. STARTING METHODS

Whenever possible, the motor starting must be Direct On Line (DOL) at rated voltage. This is the most simple
and feasible starting method. However, it must only be applied when the starting current does not affect the
power supply. Please consider the local electric utility regulations when installing a motor.
High inrush current may result in:
a) high voltage drop in the power supply line creating unacceptable line disturbance on the distribution system;
b) requiring oversized protection system (cables and contactor) increasing the installation costs.
If DOL starting is not allowed due to the reasons mentioned above, an indirect starting method compatible with
the load and motor voltage to reduce the starting current may be used.
If reduced voltage starters are used for starting, the motor starting torque will also be reduced.
Table 6.8 shows the possible indirect starting methods that can be used depending on the number of the
motor leads.
Manual of Electric Motors 103