7.2 Electrical connection
The electrical installation should be carried out by authorised
persons in accordance with local regulations.
The wiring diagram is located in the terminal box cover.
WARNING
Electric shock
Death or serious personal injury
‐
Before removing the terminal box cover and before
any dismantling of the motor, switch off the power sup-
ply.
‐
Follow the wiring diagram located in the terminal box
cover.
‐
Do not remove nor move the insulation material, if any,
present inside the terminal box.
The terminal box of single-speed motors normally contains six
winding terminals and at least one earth terminal.
WARNING
Electric shock
Death or serious personal injury
‐
The motor must be earthed.
‐
Do not connect the motor to the voltage supply until
the connection to earth has been carried out in accord-
ance with local regulations.
7.2.1 Single-phase motor
Connect single-phase motors to the mains in accordance with the
instructions located in the terminal box cover.
7.2.2 Three-phase motor
Three-phase motors can be connected in star (Y) or delta (D)
according to IEC 60034-8. See the wiring diagram in the terminal
box cover.
Voltage and connection are stated on the nameplate.
Example: 380-415 D/660-690 Y
•
If the voltage supply is 380-415 V, the motor must be connected
in delta.
•
If the voltage supply is 660-690 V, the motor must be connected
in star.
8. Starting up the product
8.1 Measuring the insulation resistance
Measure the insulation resistance before start-up and in case of any
risk of moisture in the windings.
WARNING
Electric shock
Death or serious personal injury
‐
When measuring the insulation resistance, carefully
follow the safety regulations of EN 50110-1 (operation
of power plants) and the instruction manual for meas-
uring and test equipment.
Calculate the minimum permissible insulation resistance, R, by
multiplying the rated voltage (in kV) of the motor with the constant
0.5 megohm/kV.
Stop using the motor immediately if the insulation resistance falls
below this value.
Example
If the rated voltage is 690 V, the measured resistance must be
higher than 0.69 kV × 0.5 megohm/kV = 0.35 megohm.
Measure the minimum permissible insulation resistance at a
winding temperature of 25 °C (± 15 °C).
Procedure:
•
Connect the megohmmeter between phase and earth at a
measuring voltage of 500 V DC.
•
Read the value on the megohmmeter.
WARNING
Electric shock
Death or serious personal injury
‐
During and immediately after the measurement, there
is a risk of electric shock. Do not touch the terminals
until the windings are de-energised.
If the minimum insulation resistance is not attained, the windings
are too moist and must be oven-dried.
The oven temperature must be 90 °C for 12-16 hours and then 105
°C for 6-8 hours.
Remove any drain plugs before heating.
8.2 Direction of rotation
The direction of rotation is clockwise, seen from the motor drive end
when the mains conductors are connected in accordance with the
diagram located in the terminal box cover. The direction of rotation
can be changed by switching two random mains conductors.
Some MG motors have a properly directed fan. The direc-
tion of rotation must be as stated on the motor.
9. Operation
CAUTION
Hot surface
Minor or moderate personal injury
‐
Wear personal protective equipment.
9.1 Max. number of starts per hour
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English (GB)