D860MGB rev04
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Line 230V
-Motor 230/400
Line 400V
-Motor 400/690
Line 415V
-Motor 415/720
Line 400V
-Motor 230/400
Line 690V
-Motor 400/690
Line 720V
-Motor 415/720
Figure 7 - Electrical connection of three-phase motors
4.4
MOTOR PROTECTION WITH THERMISTORS
The motors, which work covered with oil, are supplied with their thermistors 110°C. The thermistors are
inserted in windings, one for each phase and they are connected in series.
Their resistance remains very low, under 110°C, but increases drastically when 110°C are reached in one or
in all windings.
For the motor protection, the thermistors have to be connected to a proper release electronic relay
susceptible to the resistance variation.
Warning: The thermistors have not to be submitted to tensions higher than 2,5 V.
When the thermistors are properly connected, they protect the motor against the overheating of the windings.
Overheating could be caused by:
-
lack of a phase in the feeding
-
too frequent activation
-
excessive tension variations
-
excessive oil temperature
4.5
ELECTRICAL CONNECTION OF THE VALVE GROUP
The HI valve (see Figure 8) entails the following electro-valves:
•
The EVD ELECTRO-VALVE controls normal downward travel.
This electro-valve should be powered only during downward travel throughout the entire run.
•
EVE ELECTRO-VALVEV this electro-valve is used for emergency downward travel.
By powering the coil, the hydraulic valve will allow the slow speed downward travel of the car.
Figure 8
– Position of coils on the HI valve
